diff --git a/Cargo.toml b/Cargo.toml
index 8013bff13..d17a5a5d0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,4 +32,4 @@ serde = { version = "1.0.60", optional = true, default-features = false, feature
 serde_test = "1.0"
 
 [target.'cfg(loom)'.dev-dependencies]
-loom = "0.3"
+loom = "0.4"