diff --git a/Cargo.toml b/Cargo.toml
index a2d0bcd..c39529b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 
 [dependencies]
 log = "0.4"
-pretty_env_logger = "0.3"
+pretty_env_logger = "0.4"
 structopt = "0.3"
 
 [dependencies.clingo]