diff --git a/core/forkid/forkid_test.go b/core/forkid/forkid_test.go
index 179c2dd0e90..41c52891bf5 100644
--- a/core/forkid/forkid_test.go
+++ b/core/forkid/forkid_test.go
@@ -158,7 +158,8 @@ func TestCreation(t *testing.T) {
 				{2722000, 0, ID{Hash: checksumToBytes(0x8647df30), Next: 13996000}},  // First Istanbul block
 				{13996000, 0, ID{Hash: checksumToBytes(0x06cc1179), Next: 22640000}}, // First Berlin block
 				{22640000, 0, ID{Hash: checksumToBytes(0x9adf950e), Next: 41874000}}, // First London block
-				{41874000, 0, ID{Hash: checksumToBytes(0x0c015a91), Next: 0}},        // First Agra block
+				{41874000, 0, ID{Hash: checksumToBytes(0x0c015a91), Next: 45648608}}, // First Agra block
+				{45648608, 0, ID{Hash: checksumToBytes(0x0f2316c1), Next: 0}},        // First Napoli block
 			},
 		},
 		// Amoy test cases
diff --git a/params/chainspecs/mumbai.json b/params/chainspecs/mumbai.json
index 3a61eb1acd1..0222a381bfb 100644
--- a/params/chainspecs/mumbai.json
+++ b/params/chainspecs/mumbai.json
@@ -58,6 +58,7 @@
     "jaipurBlock": 22770000,
     "delhiBlock": 29638656,
     "indoreBlock": 37075456,
-    "agraBlock": 41874000
+    "agraBlock": 41874000,
+    "napoliBlock": 45648608
   }
 }