diff --git a/cmd/geth/config.go b/cmd/geth/config.go
index 81128ab007..194f779842 100644
--- a/cmd/geth/config.go
+++ b/cmd/geth/config.go
@@ -180,6 +180,11 @@ func makeFullNode(ctx *cli.Context) (*node.Node, ethapi.Backend) {
 		cfg.Eth.OverrideOptimismCanyon = &v
 	}
 
+	if ctx.IsSet(utils.OverrideOptimismInterop.Name) {
+		v := ctx.Uint64(utils.OverrideOptimismInterop.Name)
+		cfg.Eth.OverrideOptimismInterop = &v
+	}
+
 	if ctx.IsSet(utils.OverrideVerkle.Name) {
 		v := ctx.Uint64(utils.OverrideVerkle.Name)
 		cfg.Eth.OverrideVerkle = &v
diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index 88021a1a3a..d19641986b 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -68,6 +68,7 @@ var (
 		utils.OverrideCancun,
 		utils.OverrideVerkle,
 		utils.OverrideOptimismCanyon,
+		utils.OverrideOptimismInterop,
 		utils.EnablePersonal,
 		utils.TxPoolLocalsFlag,
 		utils.TxPoolNoLocalsFlag,
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 96e4ff9cb2..0c4c077c92 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -267,6 +267,11 @@ var (
 		Usage:    "Manually specify the Optimsim Canyon fork timestamp, overriding the bundled setting",
 		Category: flags.EthCategory,
 	}
+	OverrideOptimismInterop = &cli.Uint64Flag{
+		Name:     "override.interop",
+		Usage:    "Manually specify the Optimsim Interop feature-set fork timestamp, overriding the bundled setting",
+		Category: flags.EthCategory,
+	}
 	SyncModeFlag = &flags.TextMarshalerFlag{
 		Name:     "syncmode",
 		Usage:    `Blockchain sync mode ("snap", "full" or "light")`,
diff --git a/core/genesis.go b/core/genesis.go
index f46c849f48..e5126de1cb 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -259,6 +259,7 @@ type ChainOverrides struct {
 	// optimism
 	OverrideOptimismCanyon  *uint64
 	ApplySuperchainUpgrades bool
+	OverrideOptimismInterop *uint64
 }
 
 // SetupGenesisBlock writes or updates the genesis block in db.
@@ -318,6 +319,9 @@ func SetupGenesisBlockWithOverride(db ethdb.Database, triedb *trie.Database, gen
 					config.Optimism.EIP1559DenominatorCanyon = 250
 				}
 			}
+			if overrides != nil && overrides.OverrideOptimismInterop != nil {
+				config.InteropTime = overrides.OverrideOptimismInterop
+			}
 		}
 	}
 	// Just commit the new block if there is no stored genesis block.
diff --git a/eth/backend.go b/eth/backend.go
index 0f5d8a9d5c..d8e34503d4 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -223,6 +223,9 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 	if config.OverrideOptimismCanyon != nil {
 		overrides.OverrideOptimismCanyon = config.OverrideOptimismCanyon
 	}
+	if config.OverrideOptimismInterop != nil {
+		overrides.OverrideOptimismInterop = config.OverrideOptimismInterop
+	}
 	overrides.ApplySuperchainUpgrades = config.ApplySuperchainUpgrades
 	eth.blockchain, err = core.NewBlockChain(chainDb, cacheConfig, config.Genesis, &overrides, eth.engine, vmConfig, eth.shouldPreserve, &config.TransactionHistory)
 	if err != nil {
diff --git a/eth/ethconfig/config.go b/eth/ethconfig/config.go
index 32b4cfe181..ff164ed841 100644
--- a/eth/ethconfig/config.go
+++ b/eth/ethconfig/config.go
@@ -173,6 +173,8 @@ type Config struct {
 
 	OverrideOptimismCanyon *uint64 `toml:",omitempty"`
 
+	OverrideOptimismInterop *uint64 `toml:",omitempty"`
+
 	// ApplySuperchainUpgrades requests the node to load chain-configuration from the superchain-registry.
 	ApplySuperchainUpgrades bool `toml:",omitempty"`
 
diff --git a/params/config.go b/params/config.go
index 22041b76e6..3f9cabc159 100644
--- a/params/config.go
+++ b/params/config.go
@@ -359,6 +359,8 @@ type ChainConfig struct {
 	RegolithTime *uint64  `json:"regolithTime,omitempty"` // Regolith switch time (nil = no fork, 0 = already on optimism regolith)
 	CanyonTime   *uint64  `json:"canyonTime,omitempty"`   // Canyon switch time (nil = no fork, 0 = already on optimism canyon)
 
+	InteropTime *uint64 `json:"interopTime,omitempty"` // Interop switch time (nil = no fork, 0 = already on optimism interop)
+
 	// TerminalTotalDifficulty is the amount of total difficulty reached by
 	// the network that triggers the consensus upgrade.
 	TerminalTotalDifficulty *big.Int `json:"terminalTotalDifficulty,omitempty"`
@@ -505,6 +507,9 @@ func (c *ChainConfig) Description() string {
 	if c.CanyonTime != nil {
 		banner += fmt.Sprintf(" - Canyon:                      @%-10v\n", *c.CanyonTime)
 	}
+	if c.InteropTime != nil {
+		banner += fmt.Sprintf(" - Interop:                     @%-10v\n", *c.InteropTime)
+	}
 	return banner
 }
 
@@ -621,6 +626,10 @@ func (c *ChainConfig) IsCanyon(time uint64) bool {
 	return isTimestampForked(c.CanyonTime, time)
 }
 
+func (c *ChainConfig) IsInterop(time uint64) bool {
+	return isTimestampForked(c.InteropTime, time)
+}
+
 // IsOptimism returns whether the node is an optimism node or not.
 func (c *ChainConfig) IsOptimism() bool {
 	return c.Optimism != nil