diff --git a/Cargo.toml b/Cargo.toml
index 7be80b7..7902bae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ tokio-util = { version = "0.7", features = ["codec"], optional = true }
 bytes = { version = "1.4.0", optional = true }
 
 [dev-dependencies]
-proptest = "1"
+proptest = "1.4.0"
 
 [features]
 default = ["alloc", "codec"]