diff --git a/pom.xml b/pom.xml
index 306c3ab..bd1858a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -16,7 +16,7 @@ KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 -->
-<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">
   <!--
       Note that due to the special requirements of logging unit-tests, most
       tests are executed in the "integration-test" phase rather than the
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index c71fac2..e155363 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -40,7 +40,7 @@ The <action> type attribute can be add,update,fix,remove.
 
 <document xmlns="http://maven.apache.org/changes/2.0.0" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
-  xsi:schemaLocation="http://maven.apache.org/changes/2.0.0 http://maven.apache.org/xsd/changes-2.0.0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/changes/2.0.0 https://maven.apache.org/xsd/changes-2.0.0.xsd">
   <properties>
     <title>Release Notes</title>
   </properties>
diff --git a/src/conf/pmd.xml b/src/conf/pmd.xml
index 9aab35a..f8d0ed4 100644
--- a/src/conf/pmd.xml
+++ b/src/conf/pmd.xml
@@ -16,7 +16,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 -->
 <ruleset name="mybraces" xmlns="http://pmd.sourceforge.net/ruleset/2.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 http://pmd.sourceforge.net/ruleset_2_0_0.xsd">
+  xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 https://pmd.sourceforge.net/ruleset_2_0_0.xsd">
   <description>Excludes from default PMD rules.</description>
   <rule ref="category/java/errorprone.xml/EmptyCatchBlock">
     <properties>
diff --git a/src/main/assembly/bin.xml b/src/main/assembly/bin.xml
index 2cc4fe3..baa1ccc 100644
--- a/src/main/assembly/bin.xml
+++ b/src/main/assembly/bin.xml
@@ -19,7 +19,7 @@ under the License.
 -->
 <assembly xmlns="http://maven.apache.org/ASSEMBLY/2.2.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.2.0 http://maven.apache.org/xsd/assembly-2.2.0.xsd">
+    xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.2.0 https://maven.apache.org/xsd/assembly-2.2.0.xsd">
   <id>bin</id>
   <formats>
     <format>tar.gz</format>
diff --git a/src/main/assembly/src.xml b/src/main/assembly/src.xml
index 0315bac..8ea6fb3 100644
--- a/src/main/assembly/src.xml
+++ b/src/main/assembly/src.xml
@@ -19,7 +19,7 @@ under the License.
 -->
 <assembly xmlns="http://maven.apache.org/ASSEMBLY/2.2.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.2.0 http://maven.apache.org/xsd/assembly-2.2.0.xsd">
+    xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.2.0 https://maven.apache.org/xsd/assembly-2.2.0.xsd">
   <id>src</id>
   <formats>
     <format>tar.gz</format>
diff --git a/src/site/site.xml b/src/site/site.xml
index d53d2dd..a075c7e 100644
--- a/src/site/site.xml
+++ b/src/site/site.xml
@@ -18,7 +18,7 @@
 
 -->
 <project xmlns="http://maven.apache.org/DECORATION/1.1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/DECORATION/1.1.0 http://maven.apache.org/xsd/decoration-1.1.0.xsd">
+  xsi:schemaLocation="http://maven.apache.org/DECORATION/1.1.0 https://maven.apache.org/xsd/decoration-1.1.0.xsd">
   <bannerRight>
     <name>Commons Logging</name>
     <src>/images/logo.png</src>