diff --git a/Cargo.toml b/Cargo.toml
index 81a80287..0f3f820e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ appveyor = { repository = "PyO3/pyo3" }
 codecov = { repository = "PyO3/pyo3", branch = "master", service = "github" }
 
 [dependencies]
-log = "0.5"
+log = "0.4"
 libc = "0.2"
 spin = "0.4.6"
 num-traits = "0.1"