diff --git a/qdax/types.py b/qdax/types.py
index 5000869b..4581c880 100644
--- a/qdax/types.py
+++ b/qdax/types.py
@@ -45,5 +45,5 @@ def __init__(self) -> None:
 Mask: TypeAlias = jnp.ndarray
 
 # Others
-RNGKey: TypeAlias = jax.random.KeyArray
+RNGKey: TypeAlias = jax.Array
 Metrics: TypeAlias = Dict[str, jnp.ndarray]