diff --git a/crates/ethereum-forks/src/hardfork.rs b/crates/ethereum-forks/src/hardfork.rs
index 6ccb306973..41d1f13021 100644
--- a/crates/ethereum-forks/src/hardfork.rs
+++ b/crates/ethereum-forks/src/hardfork.rs
@@ -73,6 +73,9 @@ pub enum Hardfork {
     // Upcoming
     /// Prague: <https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/prague.md>
     Prague,
+    /// Fjord: <https://github.com/ethereum-optimism/specs/blob/main/specs/protocol/superchain-upgrades.md#fjord>
+    #[cfg(feature = "optimism")]
+    Fjord,
 }
 
 impl Hardfork {
diff --git a/crates/primitives/src/chain/spec.rs b/crates/primitives/src/chain/spec.rs
index fb657b5f93..a1ae18ad01 100644
--- a/crates/primitives/src/chain/spec.rs
+++ b/crates/primitives/src/chain/spec.rs
@@ -270,10 +270,10 @@ pub static OP_MAINNET: Lazy<Arc<ChainSpec>> = Lazy::new(|| {
             "7ca38a1916c42007829c55e69d3e9a73265554b586a499015373241b8a3fa48b"
         )),
         fork_timestamps: ForkTimestamps::default()
-            .shanghai(1699981200)
-            .canyon(1699981200)
-            .cancun(1707238800)
-            .ecotone(1707238800),
+            .shanghai(1704992401)
+            .canyon(1704992401)
+            .cancun(1710374401)
+            .ecotone(1710374401),
         paris_block_and_final_difficulty: Some((0, U256::from(0))),
         hardforks: BTreeMap::from([
             (Hardfork::Frontier, ForkCondition::Block(0)),
@@ -286,12 +286,12 @@ pub static OP_MAINNET: Lazy<Arc<ChainSpec>> = Lazy::new(|| {
             (Hardfork::Istanbul, ForkCondition::Block(0)),
             (Hardfork::MuirGlacier, ForkCondition::Block(0)),
             (Hardfork::Berlin, ForkCondition::Block(3950000)),
-            (Hardfork::London, ForkCondition::Block(3950000)),
-            (Hardfork::ArrowGlacier, ForkCondition::Block(3950000)),
-            (Hardfork::GrayGlacier, ForkCondition::Block(3950000)),
+            (Hardfork::London, ForkCondition::Block(105235063)),
+            (Hardfork::ArrowGlacier, ForkCondition::Block(105235063)),
+            (Hardfork::GrayGlacier, ForkCondition::Block(105235063)),
             (
                 Hardfork::Paris,
-                ForkCondition::TTD { fork_block: Some(3950000), total_difficulty: U256::from(0) },
+                ForkCondition::TTD { fork_block: Some(105235063), total_difficulty: U256::from(0) },
             ),
             (Hardfork::Bedrock, ForkCondition::Block(105235063)),
             (Hardfork::Regolith, ForkCondition::Timestamp(0)),