diff --git a/crates/optimism/chainspec/src/lib.rs b/crates/optimism/chainspec/src/lib.rs
index af432b3f12d9..8e40e1f272e4 100644
--- a/crates/optimism/chainspec/src/lib.rs
+++ b/crates/optimism/chainspec/src/lib.rs
@@ -518,7 +518,11 @@ mod tests {
                 ),
                 (
                     Head { number: 0, timestamp: 1726070401, ..Default::default() },
-                    ForkId { hash: ForkHash([0xbc, 0x38, 0xf9, 0xca]), next: 0 },
+                    ForkId { hash: ForkHash([0xbc, 0x38, 0xf9, 0xca]), next: 1736445601 },
+                ),
+                (
+                    Head { number: 0, timestamp: 1736445601, ..Default::default() },
+                    ForkId { hash: ForkHash([0x3a, 0x2a, 0xf1, 0x83]), next: 0 },
                 ),
             ],
         );
@@ -689,7 +693,7 @@ mod tests {
     #[test]
     fn latest_base_mainnet_fork_id() {
         assert_eq!(
-            ForkId { hash: ForkHash([0xbc, 0x38, 0xf9, 0xca]), next: 0 },
+            ForkId { hash: ForkHash([0x3a, 0x2a, 0xf1, 0x83]), next: 0 },
             BASE_MAINNET.latest_fork_id()
         )
     }
@@ -698,7 +702,7 @@ mod tests {
     fn latest_base_mainnet_fork_id_with_builder() {
         let base_mainnet = OpChainSpecBuilder::base_mainnet().build();
         assert_eq!(
-            ForkId { hash: ForkHash([0xbc, 0x38, 0xf9, 0xca]), next: 0 },
+            ForkId { hash: ForkHash([0x3a, 0x2a, 0xf1, 0x83]), next: 0 },
             base_mainnet.latest_fork_id()
         )
     }
diff --git a/crates/optimism/hardforks/src/hardfork.rs b/crates/optimism/hardforks/src/hardfork.rs
index 962d7bca4bcd..db886415beb4 100644
--- a/crates/optimism/hardforks/src/hardfork.rs
+++ b/crates/optimism/hardforks/src/hardfork.rs
@@ -196,7 +196,7 @@ impl OpHardfork {
                 Self::Ecotone => Some(1710374401),
                 Self::Fjord => Some(1720627201),
                 Self::Granite => Some(1726070401),
-                Self::Holocene => None,
+                Self::Holocene => Some(1736445601),
                 Self::Isthmus => todo!(),
             },
         )
@@ -230,6 +230,7 @@ impl OpHardfork {
             (Self::Ecotone.boxed(), ForkCondition::Timestamp(1710374401)),
             (Self::Fjord.boxed(), ForkCondition::Timestamp(1720627201)),
             (Self::Granite.boxed(), ForkCondition::Timestamp(1726070401)),
+            (Self::Holocene.boxed(), ForkCondition::Timestamp(1736445601)),
         ])
     }
 
@@ -325,6 +326,7 @@ impl OpHardfork {
             (Self::Ecotone.boxed(), ForkCondition::Timestamp(1710374401)),
             (Self::Fjord.boxed(), ForkCondition::Timestamp(1720627201)),
             (Self::Granite.boxed(), ForkCondition::Timestamp(1726070401)),
+            (Self::Holocene.boxed(), ForkCondition::Timestamp(1736445601)),
         ])
     }
 }