diff --git a/CMakeLists.txt b/CMakeLists.txt
index 64bf5c22..9492abcb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,7 +53,7 @@ FetchContent_Declare(
 
 FetchContent_Declare(
     zlib
-    URL http://github.com/madler/zlib/archive/refs/tags/v1.2.11.zip
+    URL https://github.com/madler/zlib/archive/refs/tags/v1.2.11.zip
     URL_HASH MD5=9d6a627693163bbbf3f26403a3a0b0b1
 )