diff --git a/README.md b/README.md
index 1586b2a62..c0b164bcf 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ This page also contains a section about building lib3mf from source or obtaining
 ## Licenses and third party code
 lib3mf is released under the [BSD license](LICENSE). The library contains code of the following [third parties](SDK/Credits.txt):
 1. libzip 1.10.1, https://libzip.org/license/
-2. zlib 1.3.0, http://www.zlib.net/zlib_license.html
+2. zlib 1.3.1, http://www.zlib.net/zlib_license.html
 3. cpp-base64 2.rc.08, https://github.com/ReneNyffenegger/cpp-base64/blob/master/LICENSE
 4. fast-float v6.0.0, https://github.com/fastfloat/fast_float/tree/v6.0.0?tab=License-3-ov-file