diff --git a/scripts/install_zlib.ps1 b/scripts/install_zlib.ps1
index a0e30584..7b76f1bd 100755
--- a/scripts/install_zlib.ps1
+++ b/scripts/install_zlib.ps1
@@ -6,7 +6,7 @@
 
 Param(
   [Parameter(Mandatory)]$installdir,
-  $version="1.2.11",
+  $version="1.2.12",
   $builddir="zlib-$version",
   $archive="zlib-$version.tar.gz",
   $archive_url="https://zlib.net/fossils/$archive",