diff --git a/src/ethereum_test_types/tests/test_types.py b/src/ethereum_test_types/tests/test_types.py
index 8d49f7c2ab..b7f916476a 100644
--- a/src/ethereum_test_types/tests/test_types.py
+++ b/src/ethereum_test_types/tests/test_types.py
@@ -486,7 +486,7 @@ def test_account_merge(
                 "blockHashes": {},
                 "ommers": [],
                 "parentUncleHash": (
-                    "0x0000000000000000000000000000000000000000000000000000000000000000"
+                    "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
                 ),
             },
             id="environment_1",
diff --git a/src/ethereum_test_types/types.py b/src/ethereum_test_types/types.py
index d695aa4ee7..f8a80423e8 100644
--- a/src/ethereum_test_types/types.py
+++ b/src/ethereum_test_types/types.py
@@ -31,6 +31,7 @@
     BLSSignature,
     Bytes,
     CamelModel,
+    EmptyOmmersRoot,
     Hash,
     HexNumber,
     Number,
@@ -402,7 +403,7 @@ class Environment(EnvironmentGeneric[Number]):
     """
 
     blob_gas_used: Number | None = Field(None, alias="currentBlobGasUsed")
-    parent_ommers_hash: Hash = Field(Hash(0), alias="parentUncleHash")
+    parent_ommers_hash: Hash = Field(Hash(EmptyOmmersRoot), alias="parentUncleHash")
     parent_blob_gas_used: Number | None = Field(None)
     parent_excess_blob_gas: Number | None = Field(None)
     parent_beacon_block_root: Hash | None = Field(None)