diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index f857221888d..dfc4b6151b4 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -131,9 +131,9 @@ def cmd_msbuild(
         "bins": ["cjpeg.exe", "djpeg.exe"],
     },
     "zlib": {
-        "url": "http://zlib.net/zlib1211.zip",
-        "filename": "zlib1211.zip",
-        "dir": "zlib-1.2.11",
+        "url": "http://zlib.net/zlib1212.zip",
+        "filename": "zlib1212.zip",
+        "dir": "zlib-1.2.12",
         "build": [
             cmd_nmake(r"win32\Makefile.msc", "clean"),
             cmd_nmake(r"win32\Makefile.msc", "zlib.lib"),