diff --git a/packages/config/src/chainConfig/networks/holesky.ts b/packages/config/src/chainConfig/networks/holesky.ts
index 2e59f4fcb5a6..e255369ccbaa 100644
--- a/packages/config/src/chainConfig/networks/holesky.ts
+++ b/packages/config/src/chainConfig/networks/holesky.ts
@@ -31,6 +31,9 @@ export const holeskyChainConfig: ChainConfig = {
   // Capella
   CAPELLA_FORK_VERSION: b("0x04017000"),
   CAPELLA_FORK_EPOCH: 256,
+  // Deneb
+  DENEB_FORK_VERSION: b("0x05017000"),
+  DENEB_FORK_EPOCH: 29696,
 
   // # 28,000,000,000 Gwei to ensure quicker ejection
   EJECTION_BALANCE: 28000000000,
diff --git a/packages/config/src/chainConfig/networks/sepolia.ts b/packages/config/src/chainConfig/networks/sepolia.ts
index b5a261f95910..0599d020ae4f 100644
--- a/packages/config/src/chainConfig/networks/sepolia.ts
+++ b/packages/config/src/chainConfig/networks/sepolia.ts
@@ -30,6 +30,9 @@ export const sepoliaChainConfig: ChainConfig = {
   // Capella
   CAPELLA_FORK_VERSION: b("0x90000072"),
   CAPELLA_FORK_EPOCH: 56832,
+  // Deneb
+  DENEB_FORK_VERSION: b("0x90000073"),
+  DENEB_FORK_EPOCH: 132608,
 
   // Deposit contract
   // ---------------------------------------------------------------