diff --git a/Makefile b/Makefile
index 797dbdd650..58ca0cbe0e 100644
--- a/Makefile
+++ b/Makefile
@@ -137,7 +137,7 @@ arbitrary-fuzz:
 audit:
 	cargo install --force cargo-audit
 	# TODO: we should address this --ignore.
-	cargo audit --ignore RUSTSEC-2016-0002 --ignore RUSTSEC-2020-0008 --ignore RUSTSEC-2017-0002
+	cargo audit --ignore RUSTSEC-2016-0002 --ignore RUSTSEC-2020-0008 --ignore RUSTSEC-2017-0002 --ignore RUSTSEC-2021-0020
 
 # Runs `cargo udeps` to check for unused dependencies
 udeps: