diff --git a/src/ethereum_test_forks/base_fork.py b/src/ethereum_test_forks/base_fork.py
index 1bc51683fc..2ddfbe13c2 100644
--- a/src/ethereum_test_forks/base_fork.py
+++ b/src/ethereum_test_forks/base_fork.py
@@ -174,6 +174,16 @@ def engine_new_payload_beacon_root(cls, block_number: int = 0, timestamp: int =
         """
         pass
 
+    @classmethod
+    @abstractmethod
+    def engine_forkchoice_updated_version(
+        cls, block_number: int = 0, timestamp: int = 0
+    ) -> Optional[int]:
+        """
+        Returns `None` if the forks canonical chain cannot be set using the forkchoice method.
+        """
+        pass
+
     # Meta information about the fork
     @classmethod
     def name(cls) -> str:
diff --git a/src/ethereum_test_forks/forks/forks.py b/src/ethereum_test_forks/forks/forks.py
index c8e7fe86eb..8a45ba91a1 100644
--- a/src/ethereum_test_forks/forks/forks.py
+++ b/src/ethereum_test_forks/forks/forks.py
@@ -91,6 +91,15 @@ def engine_new_payload_beacon_root(cls, block_number: int = 0, timestamp: int =
         """
         return False
 
+    @classmethod
+    def engine_forkchoice_updated_version(
+        cls, block_number: int = 0, timestamp: int = 0
+    ) -> Optional[int]:
+        """
+        At genesis, forkchoice updates cannot be sent through the engine API.
+        """
+        return cls.engine_new_payload_version(block_number, timestamp)
+
     @classmethod
     def get_reward(cls, block_number: int = 0, timestamp: int = 0) -> int:
         """
diff --git a/src/ethereum_test_tools/common/types.py b/src/ethereum_test_tools/common/types.py
index 59d33f73bf..7ee3d8f21f 100644
--- a/src/ethereum_test_tools/common/types.py
+++ b/src/ethereum_test_tools/common/types.py
@@ -2674,6 +2674,11 @@ class Fixture:
             to_json=True,
         ),
     )
+    fcu_version: Optional[int] = field(
+        json_encoder=JSONEncoder.Field(
+            name="engineFcuVersion",
+        ),
+    )
     genesis: FixtureHeader = field(
         json_encoder=JSONEncoder.Field(
             name="genesisBlockHeader",
diff --git a/src/ethereum_test_tools/filling/fill.py b/src/ethereum_test_tools/filling/fill.py
index 9a4d5e9435..2169239cf3 100644
--- a/src/ethereum_test_tools/filling/fill.py
+++ b/src/ethereum_test_tools/filling/fill.py
@@ -44,6 +44,11 @@ def fill_test(
         pre_state=pre,
         post_state=alloc_to_accounts(alloc),
         seal_engine=engine,
+        fcu_version=fork.engine_forkchoice_updated_version(
+            blocks[-1].block_header.number, blocks[-1].block_header.timestamp
+        )
+        if not test_spec.base_test_config.disable_hive and blocks[-1].block_header
+        else None,
         name=test_spec.tag,
     )
     fixture.fill_info(t8n, spec)
diff --git a/whitelist.txt b/whitelist.txt
index a1d56eb82e..9aa6661d87 100644
--- a/whitelist.txt
+++ b/whitelist.txt
@@ -83,6 +83,7 @@ extcodesize
 fn
 fname
 forkchoice
+fcu
 formatOnSave
 formatter
 fromhex