diff --git a/Cargo.toml b/Cargo.toml
index 6ae3872..f68d7b7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -38,4 +38,4 @@ i128 = ["num-traits/i128"]
 std = ["num-traits/std"]
 
 [build-dependencies]
-autocfg = "0.1.3"
+autocfg = "1"