diff --git a/deny.toml b/deny.toml
index 35adb8d4ec20031abb370aa1e295c7a6a8797aa0..0ed91ca7b7765821585c8c94db3d0a2576d8a4eb 100644
--- a/deny.toml
+++ b/deny.toml
@@ -54,6 +54,11 @@ license-files = [
     { path = "LICENSE", hash = 0xbd0eed23 },
 ]
 
+[[licenses.exceptions]]
+allow = ["Unlicense"]
+name = "async_io_stream"
+version = "0.3.1"
+
 [sources]
 unknown-registry = "deny"
 unknown-git = "deny"