--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,12 +21,6 @@
 keywords = ["data-structures"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/contain-rs/lru-cache"
-[dependencies.heapsize]
-version = "0.4"
-optional = true
 
 [dependencies.linked-hash-map]
 version = "0.5"
-
-[features]
-heapsize_impl = ["heapsize", "linked-hash-map/heapsize_impl"]