diff --git a/beacon_chain/libnimbus_lc/libnimbus_lc.nim b/beacon_chain/libnimbus_lc/libnimbus_lc.nim
index c3aa4eac9e..cb0c7876b1 100644
--- a/beacon_chain/libnimbus_lc/libnimbus_lc.nim
+++ b/beacon_chain/libnimbus_lc/libnimbus_lc.nim
@@ -9,6 +9,7 @@
 
 import
   std/[json, sequtils, times],
+  stew/saturation_arith,
   eth/common/[eth_types_rlp, transaction],
   eth/keys,
   eth/p2p/discoveryv5/random2,
@@ -1257,8 +1258,8 @@ proc ETHExecutionBlockHeaderCreateFromJson(
     logsBloom: distinctBase(data.logsBloom),
     difficulty: data.difficulty,
     number: distinctBase(data.number),
-    gasLimit: distinctBase(data.gasLimit),
-    gasUsed: distinctBase(data.gasUsed),
+    gasLimit: GasInt.saturate distinctBase(data.gasLimit),
+    gasUsed: GasInt.saturate distinctBase(data.gasUsed),
     timestamp: EthTime(distinctBase(data.timestamp)),
     extraData: distinctBase(data.extraData),
     mixHash: data.mixHash.asEth2Digest,
@@ -1613,9 +1614,9 @@ proc ETHTransactionsCreateFromJson(
       chainId: distinctBase(tx.chainId).u256,
       `from`: ExecutionAddress(data: fromAddress),
       nonce: tx.nonce,
-      maxPriorityFeePerGas: tx.maxPriorityFeePerGas,
-      maxFeePerGas: tx.maxFeePerGas,
-      gas: tx.gasLimit,
+      maxPriorityFeePerGas: tx.maxPriorityFeePerGas.uint64,
+      maxFeePerGas: tx.maxFeePerGas.uint64,
+      gas: tx.gasLimit.uint64,
       destinationType: destinationType,
       to: ExecutionAddress(data: toAddress),
       value: tx.value,
diff --git a/beacon_chain/spec/helpers.nim b/beacon_chain/spec/helpers.nim
index ee376329d8..f0d2d00916 100644
--- a/beacon_chain/spec/helpers.nim
+++ b/beacon_chain/spec/helpers.nim
@@ -513,9 +513,9 @@ proc blockToBlockHeader*(blck: ForkyBeaconBlock): ExecutionBlockHeader =
     logsBloom             : payload.logs_bloom.data,
     difficulty            : default(DifficultyInt),
     number                : payload.block_number,
-    gasLimit              : cast[GasInt](payload.gas_limit),
-    gasUsed               : cast[GasInt](payload.gas_used),
-    timestamp             : EthTime(int64.saturate payload.timestamp),
+    gasLimit              : GasInt.saturate(payload.gas_limit),
+    gasUsed               : GasInt.saturate(payload.gas_used),
+    timestamp             : EthTime(payload.timestamp),
     extraData             : payload.extra_data.asSeq,
     mixHash               : payload.prev_randao, # EIP-4399 `mixHash` -> `prevRandao`
     nonce                 : default(BlockNonce),
diff --git a/tests/testblockutil.nim b/tests/testblockutil.nim
index e3a1dba835..7820fb5574 100644
--- a/tests/testblockutil.nim
+++ b/tests/testblockutil.nim
@@ -118,6 +118,8 @@ proc build_empty_merge_execution_payload(state: bellatrix.BeaconState):
   bellatrix.ExecutionPayloadForSigning(executionPayload: payload,
                                        blockValue: Wei.zero)
 
+from stew/saturating_arith import saturate
+
 proc build_empty_execution_payload(
     state: bellatrix.BeaconState,
     feeRecipient: Eth1Address): bellatrix.ExecutionPayloadForSigning =
@@ -127,8 +129,8 @@ proc build_empty_execution_payload(
     latest = state.latest_execution_payload_header
     timestamp = compute_timestamp_at_slot(state, state.slot)
     randao_mix = get_randao_mix(state, get_current_epoch(state))
-    base_fee = calcEip1599BaseFee(latest.gas_limit,
-                                  latest.gas_used,
+    base_fee = calcEip1599BaseFee(GasInt.saturate latest.gas_limit,
+                                  GasInt.saturate latest.gas_used,
                                   latest.base_fee_per_gas)
 
   var payload = bellatrix.ExecutionPayloadForSigning(
diff --git a/vendor/nim-eth b/vendor/nim-eth
index 9b6497ed8a..f169068df6 160000
--- a/vendor/nim-eth
+++ b/vendor/nim-eth
@@ -1 +1 @@
-Subproject commit 9b6497ed8a05ba25ee47142f3fc1f61742b51a6c
+Subproject commit f169068df6c11a2aeba27584c60e354e19c42e94