diff --git a/.deny.toml b/.deny.toml
index 74771a0..f526a48 100644
--- a/.deny.toml
+++ b/.deny.toml
@@ -98,6 +98,7 @@ allow = [
     "BSD-3-Clause",
     "OpenSSL",
     "Unicode-3.0",
+    "Zlib",
 ]
 # The confidence threshold for detecting a license from license text.
 # The higher the value, the more closely the license text must be to the