diff --git a/deny.toml b/deny.toml
index 58cc98d..21fa937 100644
--- a/deny.toml
+++ b/deny.toml
@@ -41,6 +41,7 @@ allow = [
     "MPL-2.0",
     "Unicode-DFS-2016",
     "CC0-1.0",
+    "ISC",
 ]
 # List of explicitly disallowed licenses
 # See https://spdx.org/licenses/ for list of possible licenses