diff --git a/postgres-protocol/Cargo.toml b/postgres-protocol/Cargo.toml
index 38ce2048f..9e45d3676 100644
--- a/postgres-protocol/Cargo.toml
+++ b/postgres-protocol/Cargo.toml
@@ -9,7 +9,7 @@ repository = "https://github.com/sfackler/rust-postgres"
 readme = "../README.md"
 
 [dependencies]
-base64 = "0.20"
+base64 = "0.21"
 byteorder = "1.0"
 bytes = "1.0"
 fallible-iterator = "0.2"