diff --git a/Cargo.toml b/Cargo.toml
index f4a60ee..fb908e1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,7 +40,7 @@ version = "0.4"
 version = "0.7"
 
 [dependencies.subtle]
-version = "^0.3"
+version = "0.5"
 default-features = false
 
 [dependencies.clear_on_drop]