diff --git a/deny.toml b/deny.toml
index 28aff46..80da5fc 100644
--- a/deny.toml
+++ b/deny.toml
@@ -44,6 +44,7 @@ allow = [
     "Apache-2.0",
     "Unicode-3.0",
     "BSD-3-Clause",
+    "Zlib"
 ]
 
 exceptions = [