diff --git a/README.md b/README.md
index 751c8e8..1d45577 100644
--- a/README.md
+++ b/README.md
@@ -137,7 +137,7 @@ will generate an `AtomicParsley` executable.
 ### Dependencies:
 
 zlib  - used to compress ID3 frames & expand already compressed frames
-        available from http://www.zlib.net
+        available from https://www.zlib.net
 
 ## A note on maintenance!