diff --git a/Cargo.toml b/Cargo.toml
index aa46421..09a2669 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ keywords = ["google", "oauth", "v2"]
 license = "MIT OR Apache-2.0"
 
 [dependencies]
-base64 = "0.5.2"
+base64 = "0.9"
 chrono = "0.2"
 hyper = "0.10.2"
 hyper-rustls = "0.6.1"