diff --git a/Cargo.toml b/Cargo.toml
index 5c35f9f42719..4bae9f5aa224 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ name = "clippy"
 plugin = true
 
 [dependencies]
-unicode-normalization = "*"
+unicode-normalization = "0.1"
 
 [dev-dependencies]
 compiletest_rs = "0.0.11"