diff --git a/pom.xml b/pom.xml
index c686edae7b..751d426ec9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,7 +15,7 @@
  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/maven-v4_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/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>org.apache.commons</groupId>
diff --git a/src/assembly/bin.xml b/src/assembly/bin.xml
index 0ee2a54b5f..823014633b 100644
--- a/src/assembly/bin.xml
+++ b/src/assembly/bin.xml
@@ -16,7 +16,7 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 -->
 <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/assembly/src.xml b/src/assembly/src.xml
index 63089e10a9..819553428b 100644
--- a/src/assembly/src.xml
+++ b/src/assembly/src.xml
@@ -16,7 +16,7 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 -->
 <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/resources/pmd/pmd-ruleset.xml b/src/site/resources/pmd/pmd-ruleset.xml
index 86f3a412d4..5acc764021 100644
--- a/src/site/resources/pmd/pmd-ruleset.xml
+++ b/src/site/resources/pmd/pmd-ruleset.xml
@@ -18,7 +18,7 @@
 <ruleset name="commons-csv-customized"
     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>
     This ruleset checks the code for discouraged programming constructs.
   </description>