diff --git a/.info.json b/.info.json
index 9fd6736..06e891e 100644
--- a/.info.json
+++ b/.info.json
@@ -80,7 +80,7 @@
             "licenseUrl": "https://github.com/libexpat/libexpat/blob/master/expat/COPYING"
         },
         {
-            "name": "Zlib 1.2.11",
+            "name": "Zlib 1.2.12",
             "url": "https://www.zlib.net/",
             "licenseUrl": "https://www.zlib.net/zlib_license.html"
         }
diff --git a/Makefile b/Makefile
index c847368..c16f224 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ SPATIALITE_VERSION = 5.0.1
 SQLITE_VERSION = 3370000
 GEOS_VERSION = 3.9.2
 PROJ_VERSION = 6.3.2
-ZLIB_VERSION = 1.2.11
+ZLIB_VERSION = 1.2.12
 TIFF_VERSION = 4.3.0
 GEOTIFF_VERSION = 1.7.0
 JPEG_VERSION = 9d
diff --git a/README.md b/README.md
index cabeb92..57eefcc 100644
--- a/README.md
+++ b/README.md
@@ -254,7 +254,7 @@ See [LICENSE](https://github.com/bugra9/gdal3.js/blob/master/LICENSE) to see the
 - [WebP 1.2.0](https://chromium.googlesource.com/webm/libwebp) [(License)](https://chromium.googlesource.com/webm/libwebp/+/refs/heads/master/COPYING)
 - [JPEG JFIF 9d](https://www.ijg.org/) [(License)](https://spdx.org/licenses/IJG.html)
 - [Expat 2.4.2](https://github.com/libexpat/libexpat) [(License)](https://github.com/libexpat/libexpat/blob/master/expat/COPYING)
-- [Zlib 1.2.11](https://www.zlib.net/) [(License)](https://www.zlib.net/zlib_license.html)
+- [Zlib 1.2.12](https://www.zlib.net/) [(License)](https://www.zlib.net/zlib_license.html)
 
 **Inspired by**
 - [ddohler/gdal-js](https://github.com/ddohler/gdal-js)