diff --git a/Cargo.toml b/Cargo.toml
index 0313ec0..c5f7ff6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,4 +40,4 @@ hmac = { version = "0.12.1" }
 sha2 = { version = "0.10.8", default-features = false }
 
 # encoding
-base64 = { version = "0.21.5" }
+base64 = { version = "0.21.6" }