diff --git a/rule-config/naver-checkstyle-rules.xml b/rule-config/naver-checkstyle-rules.xml
index dafbb4d..9c7c0ee 100644
--- a/rule-config/naver-checkstyle-rules.xml
+++ b/rule-config/naver-checkstyle-rules.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!DOCTYPE module PUBLIC
 		"-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-		"http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
+		"https://checkstyle.org/dtds/configuration_1_3.dtd">
 
 <!-- Naver coding convention for Java (version 1.2)  -->
 <!-- This rule file requires Checkstyle version 8.24 or above. -->