diff --git a/Cargo.lock b/Cargo.lock
index 5476446..19f2157 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1584,7 +1584,6 @@ dependencies = [
  "rust4d_math",
  "rust4d_physics",
  "serde",
- "slotmap",
 ]
 
 [[package]]
diff --git a/crates/rust4d_core/Cargo.toml b/crates/rust4d_core/Cargo.toml
index 5f007d0..41c1919 100644
--- a/crates/rust4d_core/Cargo.toml
+++ b/crates/rust4d_core/Cargo.toml
@@ -7,7 +7,6 @@ description = "Core types for the Rust4D engine: Transform4D, Entity, World"
 [dependencies]
 rust4d_math.workspace = true
 rust4d_physics.workspace = true
-slotmap.workspace = true
 hecs.workspace = true
 bitflags.workspace = true
 serde = { version = "1.0", features = ["derive"] }