diff --git a/pom.xml b/pom.xml
index cffc239..add33cc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		 xmlns="http://maven.apache.org/POM/4.0.0"
-		 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>
 	<artifactId>spring-cloud-stream-starter-build</artifactId>
 	<packaging>pom</packaging>
diff --git a/spring-cloud-starter-parent/pom.xml b/spring-cloud-starter-parent/pom.xml
index c836b91..aa559e4 100644
--- a/spring-cloud-starter-parent/pom.xml
+++ b/spring-cloud-starter-parent/pom.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		 xmlns="http://maven.apache.org/POM/4.0.0"
-		 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/spring-cloud-stream-dependencies/pom.xml b/spring-cloud-stream-dependencies/pom.xml
index 9c28f7d..8e346c2 100644
--- a/spring-cloud-stream-dependencies/pom.xml
+++ b/spring-cloud-stream-dependencies/pom.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		 xmlns="http://maven.apache.org/POM/4.0.0"
-		 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>
 		<artifactId>spring-cloud-dependencies-parent</artifactId>
diff --git a/spring-cloud-stream-docs/pom.xml b/spring-cloud-stream-docs/pom.xml
index b903b79..25a39c3 100644
--- a/spring-cloud-stream-docs/pom.xml
+++ b/spring-cloud-stream-docs/pom.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		 xmlns="http://maven.apache.org/POM/4.0.0"
-		 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.cloud</groupId>
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl-config.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl-config.xml
index 1dce407..5aac449 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl-config.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl-config.xml
@@ -19,5 +19,5 @@
 	<highlighter id="properties" file="./xslthl/properties-hl.xml"/>
 	<highlighter id="json" file="./xslthl/json-hl.xml"/>
 	<highlighter id="yaml" file="./xslthl/yaml-hl.xml"/>
-	<namespace prefix="xslthl" uri="http://xslthl.sf.net"/>
+	<namespace prefix="xslthl" uri="http://xslthl.sourceforge.net/"/>
 </xslthl-config>
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/bourne-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/bourne-hl.xml
index 518fdb8..b98d756 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/bourne-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/bourne-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for SH
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2010 Mathieu Malaterre
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/c-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/c-hl.xml
index 0c994db..7943634 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/c-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/c-hl.xml
@@ -3,7 +3,7 @@
 Syntax highlighting definition for C
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/cpp-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/cpp-hl.xml
index a9f7d0d..b0789e9 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/cpp-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/cpp-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for C++
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/csharp-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/csharp-hl.xml
index e21a125..59ce58e 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/csharp-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/csharp-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for C#
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/css-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/css-hl.xml
index e5a1428..b75f1e2 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/css-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/css-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for CSS files
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2011-2012 Martin Hujer, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
@@ -26,7 +26,7 @@ freely, subject to the following restrictions:
 Martin Hujer <mhujer at users.sourceforge.net>
 Michiel Hendriks <elmuerte at users.sourceforge.net>
 
-Reference: http://www.w3.org/TR/CSS21/propidx.html
+Reference: https://www.w3.org/TR/CSS21/propidx.html
 
 -->
 <highlighters>
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/html-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/html-hl.xml
index fd48f11..82d04d3 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/html-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/html-hl.xml
@@ -7,7 +7,7 @@
   myxml-hl.xml - konfigurace zvyraznovace XML, ktera zvlast zvyrazni
                  HTML elementy a XSL elementy
 
-  This file has been customized for the Asciidoctor project (http://asciidoctor.org).
+  This file has been customized for the Asciidoctor project (https://asciidoctor.org).
 -->
 <highlighters>
 	<highlighter type="xml">
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/ini-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/ini-hl.xml
index 34c1036..6bd60b3 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/ini-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/ini-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for ini files
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/java-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/java-hl.xml
index 96ef3da..d39f7da 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/java-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/java-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for Java
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/javascript-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/javascript-hl.xml
index f74807f..85710a0 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/javascript-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/javascript-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for JavaScript
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/perl-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/perl-hl.xml
index adf7b09..6518821 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/perl-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/perl-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for Perl
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/php-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/php-hl.xml
index 1060ae4..72a9bd4 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/php-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/php-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for PHP
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/properties-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/properties-hl.xml
index 775f2f1..8205aac 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/properties-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/properties-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for Java
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/python-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/python-hl.xml
index fd6db57..fa1aeb6 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/python-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/python-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for Python
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/ruby-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/ruby-hl.xml
index 5bf3473..bcef913 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/ruby-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/ruby-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for Ruby
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2005-2008 Michal Molhanec, Jirka Kosek, Michiel Hendriks
 
 This software is provided 'as-is', without any express or implied
diff --git a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/sql2003-hl.xml b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/sql2003-hl.xml
index bb561c6..85dcd03 100644
--- a/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/sql2003-hl.xml
+++ b/spring-cloud-stream-docs/src/main/docbook/xsl/xslthl/sql2003-hl.xml
@@ -4,7 +4,7 @@
 Syntax highlighting definition for SQL:1999
 
 xslthl - XSLT Syntax Highlighting
-http://sourceforge.net/projects/xslthl/
+https://sourceforge.net/projects/xslthl/
 Copyright (C) 2012 Michiel Hendriks, Martin Hujer, k42b3
 
 This software is provided 'as-is', without any express or implied