diff --git a/changelog.md b/changelog.md
index e6cfd6b4..7e5d54b1 100644
--- a/changelog.md
+++ b/changelog.md
@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changes
 - [heroku-18] Removed
 - Add documentation for migrating from heroku-community/static buildpack
+- Update zlib from 1.2.13 to 1.3.1
 
 ## [1.10] - 2023-06-13
 ### Changes
diff --git a/nginx-heroku-20.tgz b/nginx-heroku-20.tgz
index a6c590bf..2ead1c1f 100644
Binary files a/nginx-heroku-20.tgz and b/nginx-heroku-20.tgz differ
diff --git a/nginx-heroku-22.tgz b/nginx-heroku-22.tgz
index 3d2d235b..e01728b9 100644
Binary files a/nginx-heroku-22.tgz and b/nginx-heroku-22.tgz differ
diff --git a/scripts/build_nginx b/scripts/build_nginx
index b3561ef5..60d8998f 100755
--- a/scripts/build_nginx
+++ b/scripts/build_nginx
@@ -7,7 +7,7 @@
 NGINX_VERSION=${NGINX_VERSION-1.25.1}
 PCRE_VERSION=${PCRE_VERSION-8.45}
 HEADERS_MORE_VERSION=${HEADERS_MORE_VERSION-0.34}
-ZLIB_VERSION=${ZLIB_VERSION-1.2.13}
+ZLIB_VERSION=${ZLIB_VERSION-1.3.1}
 UUID4_VERSION=${UUID4_VERSION-master}
 
 nginx_tarball_url=https://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz