diff --git a/supply-chain/audits.toml b/supply-chain/audits.toml
index 827fb0ec1a..927c84e69d 100644
--- a/supply-chain/audits.toml
+++ b/supply-chain/audits.toml
@@ -58,6 +58,12 @@ criteria = "safe-to-deploy"
 version = "0.3.66"
 notes = "I am the author of this crate."
 
+[[audits.base64]]
+who = "Pat Hickey <phickey@fastly.com>"
+criteria = "safe-to-run"
+version = "0.21.0"
+notes = "This crate has no dependencies, no build.rs, and contains no unsafe code."
+
 [[audits.block-buffer]]
 who = "Benjamin Bouvier <public@benj.me>"
 criteria = "safe-to-deploy"