diff --git a/Cargo.toml b/Cargo.toml
index 62deac321..ebca6071f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,6 @@ hashbrown = "0.15"
 hashlink = "0.10"
 indexmap = "2"
 intrusive-collections = "0.9.7"
-ordermap = "1"
 parking_lot = "0.12"
 portable-atomic = "1"
 rustc-hash = "2"
@@ -42,6 +41,8 @@ shuttle = { version = "0.8.1", optional = true }
 erased-serde = { version = "0.4.6", optional = true }
 serde = { version = "1.0.219", features = ["derive"], optional = true }
 
+ordermap = { version = "1.0.0", optional = true }
+
 [features]
 default = ["salsa_unstable", "rayon", "macros", "inventory", "accumulator"]
 inventory = ["dep:inventory"]
diff --git a/src/update.rs b/src/update.rs
index 65a10df07..126c813b3 100644
--- a/src/update.rs
+++ b/src/update.rs
@@ -340,6 +340,7 @@ where
     }
 }
 
+#[cfg(feature = "ordermap")]
 unsafe impl<K, V, S> Update for ordermap::OrderMap<K, V, S>
 where
     K: Update + Eq + Hash,
@@ -351,6 +352,7 @@ where
     }
 }
 
+#[cfg(feature = "ordermap")]
 unsafe impl<K, S> Update for ordermap::OrderSet<K, S>
 where
     K: Update + Eq + Hash,