diff --git a/Cargo.toml b/Cargo.toml
index 68d32e5d..224ace7d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,4 +21,4 @@ sha-1 = "0.3.0"
 sha2 = "0.5.0"
 sha3 = "0.5.0"
 blake2 = "0.5.0"
-chrono = "0.3.1"
+chrono = "0.4.0"