diff --git a/aedi/target/library_tier1.py b/aedi/target/library_tier1.py
index dcbd1be6..8bb9f8c7 100644
--- a/aedi/target/library_tier1.py
+++ b/aedi/target/library_tier1.py
@@ -494,8 +494,8 @@ class ZlibNgTarget(base.CMakeStaticDependencyTarget):
 
     def prepare_source(self, state: BuildState):
         state.download_source(
-            'https://github.com/zlib-ng/zlib-ng/archive/refs/tags/2.1.4.tar.gz',
-            'a0293475e6a44a3f6c045229fe50f69dc0eebc62a42405a51f19d46a5541e77a')
+            'https://github.com/zlib-ng/zlib-ng/archive/refs/tags/2.1.5.tar.gz',
+            '3f6576971397b379d4205ae5451ff5a68edf6c103b2f03c4188ed7075fbb5f04')
 
     def detect(self, state: BuildState) -> bool:
         return state.has_source_file('zlib-ng.h')