diff --git a/Cargo.toml b/Cargo.toml
index f7f77892..4973142f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,7 +39,7 @@ multiple_crate_versions = "allow"
 future_not_send = "allow"
 
 [workspace.dependencies]
-allocator-api2 = { version = "0.2.21", default-features = false, features = ["alloc", "std"] }
+allocator-api2 = { version = "0.4.0", default-features = false, features = ["alloc", "std"] }
 anstream = "0.6.21"
 anyhow = "1.0.98"
 assert2 = "0.4.0"