diff --git a/appveyor/install_zlib.cmd b/appveyor/install_zlib.cmd
index 2e1a00b..cae599a 100644
--- a/appveyor/install_zlib.cmd
+++ b/appveyor/install_zlib.cmd
@@ -1,8 +1,8 @@
 REM ========================================================
 REM Install zlib
-curl -fsSL -O http://public.kymeria.fr/KIWIX/windows/zlib-1.2.11.meson.zip || exit /b 1
-7z x zlib-1.2.11.meson.zip || exit /b 1
-cd zlib-1.2.11
+curl -fsSL -O http://mirror.download.kiwix.org/dev/zlib-1.2.12.meson.zip || exit /b 1
+7z x zlib-1.2.12.meson.zip || exit /b 1
+cd zlib-1.2.12
 meson . build --prefix %EXTRA_DIR% --default-library static --buildtype release || exit /b 1
 cd build
 ninja || exit /b 1