diff --git a/deny.toml b/deny.toml
index fbf4fae..094702b 100644
--- a/deny.toml
+++ b/deny.toml
@@ -82,6 +82,7 @@ allow = [
     "BSD-3-Clause",
     "Unicode-DFS-2016",
     "Unicode-3.0",
+    "Zlib",
     #"Apache-2.0 WITH LLVM-exception",
 ]
 # List of explicitly disallowed licenses