diff --git a/.settings-template.xml b/.settings-template.xml
index 3de4a4c4bf..bc613338be 100644
--- a/.settings-template.xml
+++ b/.settings-template.xml
@@ -1,6 +1,6 @@
 <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
+	xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">
 	<profiles>
 		<profile>
 			<id>snapshot</id>
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/mappings/non-annotated.xml b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/mappings/non-annotated.xml
index 35df949a1d..9794316839 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/mappings/non-annotated.xml
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/mappings/non-annotated.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <entity-mappings xmlns="http://xmlns.jcp.org/xml/ns/persistence/orm"
 				 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-				 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence/orm http://xmlns.jcp.org/xml/ns/persistence/orm_2_1.xsd"
+				 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence/orm https://www.oracle.com/webfolder/technetwork/jsc/xml/ns/persistence/orm_2_1.xsd"
 				 version="2.1">
 	<entity class="org.springframework.boot.autoconfigure.orm.jpa.mapping.NonAnnotatedEntity">
 		<table name="NON_ANNOTATED"/>
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/persistence.xml b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/persistence.xml
index 1607abfb57..439d601d8f 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/persistence.xml
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/META-INF/persistence.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
+<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence https://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
 	<persistence-unit name="manually-configured">
 		<class>org.springframework.boot.autoconfigure.orm.jpa.test.City</class>
 		<exclude-unlisted-classes>true</exclude-unlisted-classes>
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/db/changelog/db.changelog-override.xml b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/db/changelog/db.changelog-override.xml
index 2e418cb347..52c3ccfe5d 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/db/changelog/db.changelog-override.xml
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/db/changelog/db.changelog-override.xml
@@ -3,8 +3,8 @@
         xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
-        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd
-        http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">
+        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog https://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd
+        http://www.liquibase.org/xml/ns/dbchangelog-ext https://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">
 
     <changeSet id="1" author="marceloverdijk">
         <createTable tableName="customer">
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/early-init-test.xml b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/early-init-test.xml
index 9c28c45026..2ef5e73d12 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/early-init-test.xml
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/early-init-test.xml
@@ -2,7 +2,7 @@
 
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean id="earlyInit" class="org.springframework.boot.autoconfigure.EarlyInitFactoryBean" >
 		<property name="propertyFromConfig" value="${foo}" />
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/ehcache3.xml b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/ehcache3.xml
index 12ab645b9f..73d27c811d 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/ehcache3.xml
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/ehcache3.xml
@@ -3,8 +3,8 @@
 		xmlns='http://www.ehcache.org/v3'
 		xmlns:jsr107='http://www.ehcache.org/v3/jsr107'
 		xsi:schemaLocation="
-        http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.1.xsd
-        http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.1.xsd">
+        http://www.ehcache.org/v3 https://www.ehcache.org/schema/ehcache-core-3.1.xsd
+        http://www.ehcache.org/v3/jsr107 https://www.ehcache.org/schema/ehcache-107-ext-3.1.xsd">
 
 	<cache-template name="example">
 		<heap unit="entries">200</heap>
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/condition/factorybean.xml b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/condition/factorybean.xml
index bac59ef4f0..a7852de0c2 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/condition/factorybean.xml
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/condition/factorybean.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean id="example"
 		class="org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBeanTests.ExampleFactoryBean">
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/condition/foo.xml b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/condition/foo.xml
index 735b571fc7..80a64071da 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/condition/foo.xml
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/condition/foo.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean id="foo" class="java.lang.String">
 		<constructor-arg value="foo" />
diff --git a/spring-boot-project/spring-boot-cli/samples/runner.xml b/spring-boot-project/spring-boot-cli/samples/runner.xml
index 2a8f5aad1a..ac4fb0599e 100644
--- a/spring-boot-project/spring-boot-cli/samples/runner.xml
+++ b/spring-boot-project/spring-boot-cli/samples/runner.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean id="runner" class="org.test.Runner"/>
 
diff --git a/spring-boot-project/spring-boot-cli/src/main/assembly/jar-with-dependencies.xml b/spring-boot-project/spring-boot-cli/src/main/assembly/jar-with-dependencies.xml
index a6b4733911..4a4dcdfc69 100644
--- a/spring-boot-project/spring-boot-cli/src/main/assembly/jar-with-dependencies.xml
+++ b/spring-boot-project/spring-boot-cli/src/main/assembly/jar-with-dependencies.xml
@@ -2,7 +2,7 @@
 <assembly
 	xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
 	<id>full</id>
 	<formats>
 		<format>jar</format>
diff --git a/spring-boot-project/spring-boot-cli/src/test/resources/.m2/settings.xml b/spring-boot-project/spring-boot-cli/src/test/resources/.m2/settings.xml
index 86a68acfac..6cc8d41bd2 100644
--- a/spring-boot-project/spring-boot-cli/src/test/resources/.m2/settings.xml
+++ b/spring-boot-project/spring-boot-cli/src/test/resources/.m2/settings.xml
@@ -1,12 +1,12 @@
 <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
-		http://maven.apache.org/xsd/settings-1.0.0.xsd">
+		https://maven.apache.org/xsd/settings-1.0.0.xsd">
 
 	<mirrors>
 		<mirror>
 			<id>central-mirror</id>
-			<url>http://central-mirror.example.com/maven2</url>
+			<url>https://central-mirror.example.com/maven2</url>
 			<mirrorOf>central</mirrorOf>
 		</mirror>
 	</mirrors>
diff --git a/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/active-profile-repositories/.m2/settings.xml b/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/active-profile-repositories/.m2/settings.xml
index 8cc312378d..a4bba4bb57 100644
--- a/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/active-profile-repositories/.m2/settings.xml
+++ b/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/active-profile-repositories/.m2/settings.xml
@@ -3,7 +3,7 @@
 	<mirrors>
 		<mirror>
 			<id>my-mirror</id>
-			<url>http://maven.example.com/mirror</url>
+			<url>https://maven.example.com/mirror</url>
 			<mirrorOf>my-server</mirrorOf>
 		</mirror>
 	</mirrors>
diff --git a/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/basic/.m2/settings.xml b/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/basic/.m2/settings.xml
index 5439ce8cfb..b9e5be086d 100644
--- a/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/basic/.m2/settings.xml
+++ b/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/basic/.m2/settings.xml
@@ -3,7 +3,7 @@
 	<mirrors>
 		<mirror>
 			<id>my-mirror</id>
-			<url>http://maven.example.com/mirror</url>
+			<url>https://maven.example.com/mirror</url>
 			<mirrorOf>my-server</mirrorOf>
 		</mirror>
 	</mirrors>
@@ -39,7 +39,7 @@
 	    	<repositories>
 	        	<repository>
 	            	<id>example-repository</id>
-	            	<url>http://repo.example.com</url>
+	            	<url>https://repo.example.com</url>
 	        	</repository>
 	    	</repositories>
 		</profile>
diff --git a/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/encrypted/.m2/settings.xml b/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/encrypted/.m2/settings.xml
index b8701c783a..5160df5657 100644
--- a/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/encrypted/.m2/settings.xml
+++ b/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/encrypted/.m2/settings.xml
@@ -3,7 +3,7 @@
 	<mirrors>
 		<mirror>
 			<id>my-mirror</id>
-			<url>http://maven.example.com/mirror</url>
+			<url>https://maven.example.com/mirror</url>
 			<mirrorOf>my-server</mirrorOf>
 		</mirror>
 	</mirrors>
diff --git a/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/property-interpolation/.m2/settings.xml b/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/property-interpolation/.m2/settings.xml
index 873642e6dd..a70af0b4c8 100644
--- a/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/property-interpolation/.m2/settings.xml
+++ b/spring-boot-project/spring-boot-cli/src/test/resources/maven-settings/property-interpolation/.m2/settings.xml
@@ -1,7 +1,7 @@
 <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
-		http://maven.apache.org/xsd/settings-1.0.0.xsd">
+		https://maven.apache.org/xsd/settings-1.0.0.xsd">
 
 	<localRepository>${foo}/repository</localRepository>
 
diff --git a/spring-boot-project/spring-boot-starters/src/main/assembly/starter-poms-assembly.xml b/spring-boot-project/spring-boot-starters/src/main/assembly/starter-poms-assembly.xml
index 0a81434a2f..cbc5e48bec 100644
--- a/spring-boot-project/spring-boot-starters/src/main/assembly/starter-poms-assembly.xml
+++ b/spring-boot-project/spring-boot-starters/src/main/assembly/starter-poms-assembly.xml
@@ -1,6 +1,6 @@
 <assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
+	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 https://maven.apache.org/xsd/assembly-1.1.3.xsd">
 	<id>starter-poms</id>
 	<formats>
 		<format>zip</format>
diff --git a/spring-boot-project/spring-boot-test/src/test/resources/org/springframework/boot/test/SpringApplicationConfigurationXmlConventionConfigurationTests-context.xml b/spring-boot-project/spring-boot-test/src/test/resources/org/springframework/boot/test/SpringApplicationConfigurationXmlConventionConfigurationTests-context.xml
index a25ca5b996..a231d42152 100644
--- a/spring-boot-project/spring-boot-test/src/test/resources/org/springframework/boot/test/SpringApplicationConfigurationXmlConventionConfigurationTests-context.xml
+++ b/spring-boot-project/spring-boot-test/src/test/resources/org/springframework/boot/test/SpringApplicationConfigurationXmlConventionConfigurationTests-context.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+				http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
 
 	<bean id="foo" class="java.lang.String">
 		<constructor-arg>
diff --git a/spring-boot-project/spring-boot-test/src/test/resources/org/springframework/boot/test/context/SpringBootTestXmlConventionConfigurationTests-context.xml b/spring-boot-project/spring-boot-test/src/test/resources/org/springframework/boot/test/context/SpringBootTestXmlConventionConfigurationTests-context.xml
index a25ca5b996..a231d42152 100644
--- a/spring-boot-project/spring-boot-test/src/test/resources/org/springframework/boot/test/context/SpringBootTestXmlConventionConfigurationTests-context.xml
+++ b/spring-boot-project/spring-boot-test/src/test/resources/org/springframework/boot/test/context/SpringBootTestXmlConventionConfigurationTests-context.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+				http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
 
 	<bean id="foo" class="java.lang.String">
 		<constructor-arg>
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-configuration-docs/pom.xml b/spring-boot-project/spring-boot-tools/spring-boot-configuration-docs/pom.xml
index 70d541a5a1..a2af1b413c 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-configuration-docs/pom.xml
+++ b/spring-boot-project/spring-boot-tools/spring-boot-configuration-docs/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<parent>
 		<groupId>org.springframework.boot</groupId>
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-jar/src/main/assembly/jar-with-dependencies.xml b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-jar/src/main/assembly/jar-with-dependencies.xml
index 44626f91aa..1f7cf8ec13 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-jar/src/main/assembly/jar-with-dependencies.xml
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-jar/src/main/assembly/jar-with-dependencies.xml
@@ -2,7 +2,7 @@
 <assembly
 	xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
 	<id>full</id>
 	<formats>
 		<format>jar</format>
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props-lib/src/main/assembly/app.xml b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props-lib/src/main/assembly/app.xml
index d332aebc34..83a4f927e2 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props-lib/src/main/assembly/app.xml
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props-lib/src/main/assembly/app.xml
@@ -2,7 +2,7 @@
 <assembly
 	xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
 	<id>app</id>
 	<formats>
 		<format>jar</format>
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props-lib/src/main/assembly/dependencies.xml b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props-lib/src/main/assembly/dependencies.xml
index 5044392b3e..306b55e4e9 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props-lib/src/main/assembly/dependencies.xml
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props-lib/src/main/assembly/dependencies.xml
@@ -2,7 +2,7 @@
 <assembly
 	xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
 	<id>dependencies</id>
 	<formats>
 		<format>jar</format>
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props/src/main/assembly/jar-with-dependencies.xml b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props/src/main/assembly/jar-with-dependencies.xml
index 1120acb7e2..2dbf0f3a50 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props/src/main/assembly/jar-with-dependencies.xml
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/it/executable-props/src/main/assembly/jar-with-dependencies.xml
@@ -2,7 +2,7 @@
 <assembly
 	xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+	xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 https://maven.apache.org/xsd/assembly-1.1.2.xsd">
 	<id>full</id>
 	<formats>
 		<format>jar</format>
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/resources/root/META-INF/spring/application.xml b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/resources/root/META-INF/spring/application.xml
index 704859f049..cf04aa4fbe 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/resources/root/META-INF/spring/application.xml
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/resources/root/META-INF/spring/application.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 </beans>
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/site/site.xml b/spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/site/site.xml
index 89218fd978..c393e2ceb6 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/site/site.xml
+++ b/spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/site/site.xml
@@ -1,5 +1,5 @@
 <project xmlns="http://maven.apache.org/DECORATION/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-		 xsi:schemaLocation="http://maven.apache.org/DECORATION/1.0.0 http://maven.apache.org/xsd/decoration-1.0.0.xsd">
+		 xsi:schemaLocation="http://maven.apache.org/DECORATION/1.0.0 https://maven.apache.org/xsd/decoration-1.0.0.xsd">
 	<body>
 		<menu name="Overview">
 			<item name="Introduction" href="index.html"/>
diff --git a/spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/context/embedded/tomcat/empty-web.xml b/spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/context/embedded/tomcat/empty-web.xml
index 14c04a5957..4ec3f71a4b 100644
--- a/spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/context/embedded/tomcat/empty-web.xml
+++ b/spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/context/embedded/tomcat/empty-web.xml
@@ -2,5 +2,5 @@
 <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
-	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
+	https://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 </web-app>
diff --git a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/context/properties/testProperties.xml b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/context/properties/testProperties.xml
index a8ecd1a55a..b7dc32185a 100644
--- a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/context/properties/testProperties.xml
+++ b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/context/properties/testProperties.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean
 		id="org.springframework.boot.context.properties.ConfigurationPropertiesTests$BasicProperties"
diff --git a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/diagnostics/analyzer/nounique/consumer.xml b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/diagnostics/analyzer/nounique/consumer.xml
index 9440e1af13..cf74f72245 100644
--- a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/diagnostics/analyzer/nounique/consumer.xml
+++ b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/diagnostics/analyzer/nounique/consumer.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean class="org.springframework.boot.diagnostics.analyzer.nounique.TestBeanConsumer"/>
 
diff --git a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/diagnostics/analyzer/nounique/producer.xml b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/diagnostics/analyzer/nounique/producer.xml
index 3b28fb030d..f1f3de4abb 100644
--- a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/diagnostics/analyzer/nounique/producer.xml
+++ b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/diagnostics/analyzer/nounique/producer.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean class="org.springframework.boot.diagnostics.analyzer.nounique.TestBean" name="xmlTestBean"/>
 
diff --git a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/env/test-xml.xml b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/env/test-xml.xml
index 5d3350e81f..6757e07f60 100644
--- a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/env/test-xml.xml
+++ b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/env/test-xml.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
+<!DOCTYPE properties SYSTEM "https://java.sun.com/dtd/properties.dtd">
 <properties>
 	<entry key="test">xml</entry>
 </properties>
diff --git a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/sample-beans.xml b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/sample-beans.xml
index f0fb6ce513..f66853848f 100644
--- a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/sample-beans.xml
+++ b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/sample-beans.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:context="http://www.springframework.org/schema/context"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+				http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
 
 	<bean id="myXmlComponent" class="org.springframework.boot.sampleconfig.MyComponent"/>
 </beans>
diff --git a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/web/servlet/context/exampleEmbeddedWebApplicationConfiguration.xml b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/web/servlet/context/exampleEmbeddedWebApplicationConfiguration.xml
index 92367a6fa8..e220798078 100644
--- a/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/web/servlet/context/exampleEmbeddedWebApplicationConfiguration.xml
+++ b/spring-boot-project/spring-boot/src/test/resources/org/springframework/boot/web/servlet/context/exampleEmbeddedWebApplicationConfiguration.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
 	<bean name="servletContainerFactory"
 		class="org.springframework.boot.web.servlet.server.MockServletWebServerFactory" />
diff --git a/spring-boot-samples/spring-boot-sample-cache/src/main/resources/ehcache3.xml b/spring-boot-samples/spring-boot-sample-cache/src/main/resources/ehcache3.xml
index df1a92a60d..cce17bb79e 100644
--- a/spring-boot-samples/spring-boot-sample-cache/src/main/resources/ehcache3.xml
+++ b/spring-boot-samples/spring-boot-sample-cache/src/main/resources/ehcache3.xml
@@ -1,8 +1,8 @@
 <config xmlns='http://www.ehcache.org/v3'
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		xmlns:jsr107="http://www.ehcache.org/v3/jsr107"
-		xsi:schemaLocation="http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
-							http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">
+		xsi:schemaLocation="http://www.ehcache.org/v3 https://www.ehcache.org/schema/ehcache-core-3.0.xsd
+							http://www.ehcache.org/v3/jsr107 https://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">
 	<cache alias="countries">
 		<expiry>
 			<ttl unit="seconds">600</ttl>
diff --git a/spring-boot-samples/spring-boot-sample-traditional/src/main/webapp/WEB-INF/web.xml b/spring-boot-samples/spring-boot-sample-traditional/src/main/webapp/WEB-INF/web.xml
index b7db240932..6fc387aeaf 100644
--- a/spring-boot-samples/spring-boot-sample-traditional/src/main/webapp/WEB-INF/web.xml
+++ b/spring-boot-samples/spring-boot-sample-traditional/src/main/webapp/WEB-INF/web.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
+	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 
 	<servlet>
 		<servlet-name>appServlet</servlet-name>
diff --git a/spring-boot-samples/spring-boot-sample-xml/src/main/resources/META-INF/application-context.xml b/spring-boot-samples/spring-boot-sample-xml/src/main/resources/META-INF/application-context.xml
index dcc6e4b20b..f080646aa1 100644
--- a/spring-boot-samples/spring-boot-sample-xml/src/main/resources/META-INF/application-context.xml
+++ b/spring-boot-samples/spring-boot-sample-xml/src/main/resources/META-INF/application-context.xml
@@ -2,8 +2,8 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:context="http://www.springframework.org/schema/context"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+				http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
 
 	<context:annotation-config/>
 	<context:property-placeholder/>
diff --git a/spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/resources/pom-template.xml b/spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/resources/pom-template.xml
index 965f9cc5ee..3b855f1733 100644
--- a/spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/resources/pom-template.xml
+++ b/spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/resources/pom-template.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<parent>
 		<groupId>org.springframework.boot</groupId>
diff --git a/src/checkstyle/checkstyle-suppressions.xml b/src/checkstyle/checkstyle-suppressions.xml
index 858ed62c32..05560cea65 100644
--- a/src/checkstyle/checkstyle-suppressions.xml
+++ b/src/checkstyle/checkstyle-suppressions.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0"?>
 <!DOCTYPE suppressions PUBLIC
+<<<<<<< HEAD
 		"-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
 		"https://checkstyle.org/dtds/suppressions_1_2.dtd">
 <suppressions>