diff --git a/kms/attestations/requirements.txt b/kms/attestations/requirements.txt
index 9a251876f98f..277ba3df448f 100644
--- a/kms/attestations/requirements.txt
+++ b/kms/attestations/requirements.txt
@@ -1,2 +1,2 @@
 cryptography==3.3.1
-pem==20.1.0
+pem==21.1.0