diff --git a/eth/catalyst/api.go b/eth/catalyst/api.go
index c8bee5c8a4..aa5fb02ef2 100644
--- a/eth/catalyst/api.go
+++ b/eth/catalyst/api.go
@@ -245,8 +245,9 @@ func (api *ConsensusAPI) ForkchoiceUpdatedV3(update engine.ForkchoiceStateV1, pa
 		if params.BeaconRoot == nil {
 			return engine.STATUS_INVALID, engine.InvalidPayloadAttributes.With(errors.New("missing beacon root"))
 		}
-		if api.eth.BlockChain().Config().LatestFork(params.Timestamp) != forks.Cancun && api.eth.BlockChain().Config().LatestFork(params.Timestamp) != forks.Prague {
-			return engine.STATUS_INVALID, engine.UnsupportedFork.With(errors.New("forkchoiceUpdatedV3 must only be called for cancun payloads"))
+		latestFork := api.eth.BlockChain().Config().LatestFork(params.Timestamp)
+		if latestFork != forks.Cancun && latestFork != forks.Prague && latestFork != forks.Osaka {
+			return engine.STATUS_INVALID, engine.UnsupportedFork.With(errors.New("forkchoiceUpdatedV3 must only be called for cancun, prague and osaka payloads"))
 		}
 	}
 	// TODO(matt): the spec requires that fcu is applied when called on a valid
@@ -303,8 +304,9 @@ func (api *ConsensusAPI) ForkchoiceUpdatedWithWitnessV3(update engine.Forkchoice
 		if params.BeaconRoot == nil {
 			return engine.STATUS_INVALID, engine.InvalidPayloadAttributes.With(errors.New("missing beacon root"))
 		}
-		if api.eth.BlockChain().Config().LatestFork(params.Timestamp) != forks.Cancun && api.eth.BlockChain().Config().LatestFork(params.Timestamp) != forks.Prague {
-			return engine.STATUS_INVALID, engine.UnsupportedFork.With(errors.New("forkchoiceUpdatedV3 must only be called for cancun payloads"))
+		latestFork := api.eth.BlockChain().Config().LatestFork(params.Timestamp)
+		if latestFork != forks.Cancun && latestFork != forks.Prague && latestFork != forks.Osaka {
+			return engine.STATUS_INVALID, engine.UnsupportedFork.With(errors.New("forkchoiceUpdatedV3 must only be called for cancun, prague and osaka payloads"))
 		}
 	}
 	// TODO(matt): the spec requires that fcu is applied when called on a valid
@@ -666,8 +668,9 @@ func (api *ConsensusAPI) NewPayloadV4(params engine.ExecutableData, versionedHas
 		return engine.PayloadStatusV1{Status: engine.INVALID}, engine.InvalidParams.With(errors.New("nil executionRequests post-prague"))
 	}
 
-	if api.eth.BlockChain().Config().LatestFork(params.Timestamp) != forks.Prague {
-		return engine.PayloadStatusV1{Status: engine.INVALID}, engine.UnsupportedFork.With(errors.New("newPayloadV4 must only be called for prague payloads"))
+	latestFork := api.eth.BlockChain().Config().LatestFork(params.Timestamp)
+	if latestFork != forks.Prague && latestFork != forks.Osaka {
+		return engine.PayloadStatusV1{Status: engine.INVALID}, engine.UnsupportedFork.With(errors.New("newPayloadV4 must only be called for prague or osaka payloads"))
 	}
 	requests := convertRequests(executionRequests)
 	if err := validateRequests(requests); err != nil {
@@ -788,8 +791,9 @@ func (api *ConsensusAPI) NewPayloadWithWitnessV4(params engine.ExecutableData, v
 		return engine.PayloadStatusV1{Status: engine.INVALID}, engine.InvalidParams.With(errors.New("nil executionRequests post-prague"))
 	}
 
-	if api.eth.BlockChain().Config().LatestFork(params.Timestamp) != forks.Prague {
-		return engine.PayloadStatusV1{Status: engine.INVALID}, engine.UnsupportedFork.With(errors.New("newPayloadWithWitnessV4 must only be called for prague payloads"))
+	latestFork := api.eth.BlockChain().Config().LatestFork(params.Timestamp)
+	if latestFork != forks.Prague && latestFork != forks.Osaka {
+		return engine.PayloadStatusV1{Status: engine.INVALID}, engine.UnsupportedFork.With(errors.New("newPayloadWithWitnessV4 must only be called for prague or osaka payloads"))
 	}
 	requests := convertRequests(executionRequests)
 	if err := validateRequests(requests); err != nil {