diff --git a/Cargo.toml b/Cargo.toml
index f214984..6a52c63 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ undocumented_unsafe_blocks = { level = "warn" }
 unexpected_cfgs = { level = "warn", check-cfg = ["cfg(doc_cfg)"] }
 
 [workspace.dependencies]
-allocator-api2 = { version = "0.2.21", default-features = false, features = ["alloc"] }
+allocator-api2 = { version = "0.4.0", default-features = false, features = ["alloc"] }
 bumpalo = { version = "3.19.0", features = ["allocator-api2", "collections"] }
 criterion = "0.7.0"
 daft = { version = "0.1.3", default-features = false }