diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index f671039b70..f0d864a0c7 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -73,9 +73,9 @@ jobs:
       - name: Get zlib, libpng and bison
         run: | # TODO: use an array
           $wc = New-Object System.Net.WebClient
-          $wc.DownloadFile('https://www.zlib.net/zlib1211.zip', 'zlib.zip')
+          $wc.DownloadFile('https://www.zlib.net/zlib1212.zip', 'zlib.zip')
           $hash = (Get-FileHash "zlib.zip" -Algorithm SHA256).Hash
-          if ($hash -ne 'd7510a8ee1918b7d0cad197a089c0a2cd4d6df05fee22389f67f115e738b178d') {
+          if ($hash -ne '173e89893dcb8b4a150d7731cd72f0602f1d6b45e60e2a54efdf7f3fc3325fd7') {
             Write-Host "zlib SHA256 mismatch! ($hash)"
             exit 1
           }