diff --git a/Cargo.toml b/Cargo.toml
index 75f2f69d96c..5f637fcaa52 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ diff = "0.1"
 syntex_syntax = "0.56"
 syntex_errors = "0.56"
 log = "0.3"
-env_logger = "0.3"
+env_logger = "0.4"
 getopts = "0.2"
 itertools = "0.5.8"
 multimap = "0.3"