diff --git a/README.adoc b/README.adoc
index 598fa07..d3072c5 100644
--- a/README.adoc
+++ b/README.adoc
@@ -239,7 +239,7 @@ If you need to suppress some rules (e.g. line length needs to be longer), then i
 <?xml version="1.0"?>
 <!DOCTYPE suppressions PUBLIC
 		"-//Puppy Crawl//DTD Suppressions 1.1//EN"
-		"http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
+		"https://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
 <suppressions>
 	<suppress files=".*ConfigServerApplication\.java" checks="HideUtilityClassConstructor"/>
 	<suppress files=".*ConfigClientWatch\.java" checks="LineLengthCheck"/>