diff --git a/config/checkstyle/checkStyle.xml b/config/checkstyle/checkStyle.xml
index 16fda0fdc4f..9d09ca11bee 100644
--- a/config/checkstyle/checkStyle.xml
+++ b/config/checkstyle/checkStyle.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE module PUBLIC
         "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-        "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
+        "https://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
 
 <!--
     Checkstyle configuration that checks the Google coding conventions from Google Java Style
diff --git a/config/checkstyle/checkStyleAll.xml b/config/checkstyle/checkStyleAll.xml
index 75d9d82bb6e..7278039eab2 100644
--- a/config/checkstyle/checkStyleAll.xml
+++ b/config/checkstyle/checkStyleAll.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE module PUBLIC
         "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-        "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
+        "https://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
 
 <!--
     Checkstyle configuration that checks the Google coding conventions from Google Java Style
diff --git a/framework/config/checkstyle/checkStyle.xml b/framework/config/checkstyle/checkStyle.xml
index d5395fa7cb5..049ca53c78a 100644
--- a/framework/config/checkstyle/checkStyle.xml
+++ b/framework/config/checkstyle/checkStyle.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE module PUBLIC
   "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-  "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
+  "https://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
 
 <!--
     Checkstyle configuration that checks the Google coding conventions from Google Java Style
diff --git a/framework/config/checkstyle/checkStyleAll.xml b/framework/config/checkstyle/checkStyleAll.xml
index 989c7fccfd2..c48d4c0c873 100644
--- a/framework/config/checkstyle/checkStyleAll.xml
+++ b/framework/config/checkstyle/checkStyleAll.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE module PUBLIC
   "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-  "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
+  "https://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
 
 <!--
     Checkstyle configuration that checks the Google coding conventions from Google Java Style