diff --git a/Cargo.toml b/Cargo.toml
index b5b587a6..fbcd9ce9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,7 +34,7 @@ serde = { version = "1.0", features = ["derive"], optional = true }
 serde_json = { version = "1.0", optional = true }
 
 [dev-dependencies]
-simple_logger = "2.1"
+simple_logger = "4.0"
 matches = "0.1"
 pretty_assertions = "1"