diff --git a/deny.toml b/deny.toml
index e8799d8..0465887 100644
--- a/deny.toml
+++ b/deny.toml
@@ -73,7 +73,8 @@ allow = [
     "MIT",
     "Apache-2.0",
     "Apache-2.0 WITH LLVM-exception",
-    "BSD-2-Clause"
+    "BSD-2-Clause",
+    "ISC"
 ]
 # List of explictly disallowed licenses
 # See https://spdx.org/licenses/ for list of possible licenses