diff --git a/Cargo.toml b/Cargo.toml
index d116870..f23b048 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,7 +22,7 @@ time = "^0.1"
 uuid = { version = "^0.3", features = ["v4"] }
 
 [dev-dependencies]
-env_logger = "^0.3"
+env_logger = "^0.4"
 
 [features]
 unstable = []