diff --git a/Cargo.toml b/Cargo.toml
index 1a76f87..33bbb29 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -53,7 +53,7 @@ digest = { version = "0.10", default-features = false, optional = true }
 subtle = { version = "2.3.0", default-features = false }
 serde = { version = "1.0", default-features = false, optional = true, features = ["derive"] }
 zeroize = { version = "1", default-features = false, optional = true }
-unsafe_target_feature = { version = "0.1.1", optional = true }
+unsafe_target_feature = { version = "= 0.1.1", optional = true }
 
 [target.'cfg(target_arch = "x86_64")'.dependencies]
 cpufeatures = "0.2.6"