diff --git a/checkstyle-sonar-plugin/config/import-control-test.xml b/checkstyle-sonar-plugin/config/import-control-test.xml
index 90fa1870..3e8d70d6 100644
--- a/checkstyle-sonar-plugin/config/import-control-test.xml
+++ b/checkstyle-sonar-plugin/config/import-control-test.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE import-control PUBLIC
     "-//Puppy Crawl//DTD Import Control 1.3//EN"
-    "http://checkstyle.sourceforge.net/dtds/import_control_1_3.dtd">
+    "https://checkstyle.org/dtds/import_control_1_3.dtd">
 
 <import-control pkg="org.sonar.plugins.checkstyle">
 
diff --git a/checkstyle-sonar-plugin/config/import-control.xml b/checkstyle-sonar-plugin/config/import-control.xml
index 20c6d84b..7ed1cc4e 100644
--- a/checkstyle-sonar-plugin/config/import-control.xml
+++ b/checkstyle-sonar-plugin/config/import-control.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE import-control PUBLIC
     "-//Puppy Crawl//DTD Import Control 1.2//EN"
-    "http://checkstyle.sourceforge.net/dtds/import_control_1_2.dtd">
+    "https://checkstyle.org/dtds/import_control_1_2.dtd">
 
 <import-control pkg="com.github.sevntu.checkstyle">
 
diff --git a/checkstyle-sonar-plugin/config/sevntu_suppressions.xml b/checkstyle-sonar-plugin/config/sevntu_suppressions.xml
index a20a59f1..455ab5fa 100644
--- a/checkstyle-sonar-plugin/config/sevntu_suppressions.xml
+++ b/checkstyle-sonar-plugin/config/sevntu_suppressions.xml
@@ -2,7 +2,7 @@
 
 <!DOCTYPE suppressions PUBLIC
     "-//Puppy Crawl//DTD Suppressions 1.1//EN"
-    "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
+    "https://checkstyle.org/dtds/suppressions_1_1.dtd">
 
 <suppressions>
     <!-- START of legacy code, all violations will be resolved during transition to main project -->
diff --git a/checkstyle-sonar-plugin/config/suppressions-xpath.xml b/checkstyle-sonar-plugin/config/suppressions-xpath.xml
index f7cc071e..c85daaf0 100644
--- a/checkstyle-sonar-plugin/config/suppressions-xpath.xml
+++ b/checkstyle-sonar-plugin/config/suppressions-xpath.xml
@@ -2,7 +2,7 @@
 
 <!DOCTYPE suppressions PUBLIC
     "-//Puppy Crawl//DTD Suppressions Xpath Experimental 1.2//EN"
-    "http://checkstyle.sourceforge.net/dtds/suppressions_1_2_xpath_experimental.dtd">
+    "https://checkstyle.org/dtds/suppressions_1_2_xpath_experimental.dtd">
 
 <suppressions>
 
diff --git a/checkstyle-sonar-plugin/config/suppressions.xml b/checkstyle-sonar-plugin/config/suppressions.xml
index d16d8c0c..97de1608 100644
--- a/checkstyle-sonar-plugin/config/suppressions.xml
+++ b/checkstyle-sonar-plugin/config/suppressions.xml
@@ -2,7 +2,7 @@
 
 <!DOCTYPE suppressions PUBLIC
     "-//Puppy Crawl//DTD Suppressions 1.1//EN"
-    "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
+    "https://checkstyle.org/dtds/suppressions_1_1.dtd">
 
 <suppressions>
     <!-- START of legacy code, all violations will be resolved during transition to main project -->
diff --git a/checkstyle-sonar-plugin/src/main/java/org/sonar/plugins/checkstyle/CheckstyleProfileExporter.java b/checkstyle-sonar-plugin/src/main/java/org/sonar/plugins/checkstyle/CheckstyleProfileExporter.java
index ae9e958e..00f6509d 100644
--- a/checkstyle-sonar-plugin/src/main/java/org/sonar/plugins/checkstyle/CheckstyleProfileExporter.java
+++ b/checkstyle-sonar-plugin/src/main/java/org/sonar/plugins/checkstyle/CheckstyleProfileExporter.java
@@ -49,7 +49,7 @@ public class CheckstyleProfileExporter extends ProfileExporter {
 
     public static final String DOCTYPE_DECLARATION =
         "<!DOCTYPE module PUBLIC \"-//Puppy Crawl//DTD Check Configuration 1.2//EN\" "
-        + "\"http://www.puppycrawl.com/dtds/configuration_1_2.dtd\">";
+        + "\"https://checkstyle.org/dtds/configuration_1_2.dtd\">";
     private static final String CLOSE_MODULE = "</module>";
 
     private final Configuration configuration;
diff --git a/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/idPropertyShouldBeTheRuleKey.xml b/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/idPropertyShouldBeTheRuleKey.xml
index 0229f0c2..2fce1f28 100644
--- a/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/idPropertyShouldBeTheRuleKey.xml
+++ b/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/idPropertyShouldBeTheRuleKey.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
+<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "https://checkstyle.org/dtds/configuration_1_2.dtd">
 <!-- Generated by Sonar -->
 <module name="Checker">
     <module name="JavadocPackage">
diff --git a/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/shouldUseTheIdPropertyToFindRule.xml b/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/shouldUseTheIdPropertyToFindRule.xml
index 149a5ed0..173ac154 100644
--- a/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/shouldUseTheIdPropertyToFindRule.xml
+++ b/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/shouldUseTheIdPropertyToFindRule.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
+<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "https://checkstyle.org/dtds/configuration_1_2.dtd">
 <!-- Generated by Sonar -->
 <module name="Checker">
     <module name="JavadocPackage">
diff --git a/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/simple.xml b/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/simple.xml
index 3cf5c96d..96e6055b 100644
--- a/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/simple.xml
+++ b/checkstyle-sonar-plugin/src/test/resources/org/sonar/plugins/checkstyle/CheckstyleProfileImporterTest/simple.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
+<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "https://checkstyle.org/dtds/configuration_1_2.dtd">
 <!-- Generated by Sonar -->
 <module name="Checker">
     <module name="JavadocPackage">
diff --git a/checkstyle-sonar-plugin/test-resources/checkstyle-conf.xml b/checkstyle-sonar-plugin/test-resources/checkstyle-conf.xml
index e66363f0..aced4b09 100644
--- a/checkstyle-sonar-plugin/test-resources/checkstyle-conf.xml
+++ b/checkstyle-sonar-plugin/test-resources/checkstyle-conf.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
+<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "https://checkstyle.org/dtds/configuration_1_2.dtd">
 <!-- Generated by Sonar -->
 <module name="Checker">
     <module name="JavadocPackage">