diff --git a/crates/chainspec/src/spec.rs b/crates/chainspec/src/spec.rs
index cbe3a5444..14019e1f7 100644
--- a/crates/chainspec/src/spec.rs
+++ b/crates/chainspec/src/spec.rs
@@ -1383,7 +1383,11 @@ Post-merge hard forks (timestamp based):
                 ),
                 (
                     EthereumHardfork::Cancun,
-                    ForkId { hash: ForkHash([0x88, 0xcf, 0x81, 0xd9]), next: 0 },
+                    ForkId { hash: ForkHash([0x88, 0xcf, 0x81, 0xd9]), next: 1741159776 },
+                ),
+                (
+                    EthereumHardfork::Prague,
+                    ForkId { hash: ForkHash([0xed, 0x88, 0xb5, 0xfd]), next: 0 },
                 ),
             ],
         );
@@ -1497,7 +1501,17 @@ Post-merge hard forks (timestamp based):
                 // First Cancun block
                 (
                     Head { number: 123, timestamp: 1707305664, ..Default::default() },
-                    ForkId { hash: ForkHash([0x9b, 0x19, 0x2a, 0xd0]), next: 0 },
+                    ForkId { hash: ForkHash([0x9b, 0x19, 0x2a, 0xd0]), next: 1740434112 },
+                ),
+                // Last Cancun block
+                (
+                    Head { number: 123, timestamp: 1740434111, ..Default::default() },
+                    ForkId { hash: ForkHash([0x9b, 0x19, 0x2a, 0xd0]), next: 1740434112 },
+                ),
+                // First Prague block
+                (
+                    Head { number: 123, timestamp: 1740434112, ..Default::default() },
+                    ForkId { hash: ForkHash([0xdf, 0xbd, 0x9b, 0xed]), next: 0 },
                 ),
             ],
         )
@@ -1526,18 +1540,28 @@ Post-merge hard forks (timestamp based):
                 ),
                 // First Shanghai block
                 (
-                    Head { number: 1735372, timestamp: 1677557088, ..Default::default() },
+                    Head { number: 1735373, timestamp: 1677557088, ..Default::default() },
                     ForkId { hash: ForkHash([0xf7, 0xf9, 0xbc, 0x08]), next: 1706655072 },
                 ),
                 // Last Shanghai block
                 (
-                    Head { number: 1735372, timestamp: 1706655071, ..Default::default() },
+                    Head { number: 1735374, timestamp: 1706655071, ..Default::default() },
                     ForkId { hash: ForkHash([0xf7, 0xf9, 0xbc, 0x08]), next: 1706655072 },
                 ),
                 // First Cancun block
                 (
-                    Head { number: 1735372, timestamp: 1706655072, ..Default::default() },
-                    ForkId { hash: ForkHash([0x88, 0xcf, 0x81, 0xd9]), next: 0 },
+                    Head { number: 1735375, timestamp: 1706655072, ..Default::default() },
+                    ForkId { hash: ForkHash([0x88, 0xcf, 0x81, 0xd9]), next: 1741159776 },
+                ),
+                // Last Cancun block
+                (
+                    Head { number: 1735376, timestamp: 1741159775, ..Default::default() },
+                    ForkId { hash: ForkHash([0x88, 0xcf, 0x81, 0xd9]), next: 1741159776 },
+                ),
+                // First Prague block
+                (
+                    Head { number: 1735377, timestamp: 1741159776, ..Default::default() },
+                    ForkId { hash: ForkHash([0xed, 0x88, 0xb5, 0xfd]), next: 0 },
                 ),
             ],
         );
diff --git a/crates/ethereum-forks/src/hardfork/ethereum.rs b/crates/ethereum-forks/src/hardfork/ethereum.rs
index 684f15992..75095e440 100644
--- a/crates/ethereum-forks/src/hardfork/ethereum.rs
+++ b/crates/ethereum-forks/src/hardfork/ethereum.rs
@@ -363,7 +363,7 @@ impl EthereumHardfork {
     }
 
     /// Ethereum sepolia list of hardforks.
-    pub const fn sepolia() -> [(Self, ForkCondition); 15] {
+    pub const fn sepolia() -> [(Self, ForkCondition); 16] {
         [
             (Self::Frontier, ForkCondition::Block(0)),
             (Self::Homestead, ForkCondition::Block(0)),
@@ -387,11 +387,12 @@ impl EthereumHardfork {
             ),
             (Self::Shanghai, ForkCondition::Timestamp(1677557088)),
             (Self::Cancun, ForkCondition::Timestamp(1706655072)),
+            (Self::Prague, ForkCondition::Timestamp(1741159776)),
         ]
     }
 
     /// Ethereum holesky list of hardforks.
-    pub const fn holesky() -> [(Self, ForkCondition); 15] {
+    pub const fn holesky() -> [(Self, ForkCondition); 16] {
         [
             (Self::Frontier, ForkCondition::Block(0)),
             (Self::Homestead, ForkCondition::Block(0)),
@@ -415,6 +416,7 @@ impl EthereumHardfork {
             ),
             (Self::Shanghai, ForkCondition::Timestamp(1696000704)),
             (Self::Cancun, ForkCondition::Timestamp(1707305664)),
+            (Self::Prague, ForkCondition::Timestamp(1740434112)),
         ]
     }
 }