diff --git a/besu/src/test/java/org/hyperledger/besu/ForkIdsTest.java b/besu/src/test/java/org/hyperledger/besu/ForkIdsTest.java
index 2729cf9703d..3cb6361f14b 100644
--- a/besu/src/test/java/org/hyperledger/besu/ForkIdsTest.java
+++ b/besu/src/test/java/org/hyperledger/besu/ForkIdsTest.java
@@ -107,8 +107,9 @@ public static Collection<Object[]> parameters() {
               new ForkId(Bytes.ofUnsignedInt(0x668db0afL), 9069000L),
               new ForkId(Bytes.ofUnsignedInt(0x879d6e30L), 9200000L),
               new ForkId(Bytes.ofUnsignedInt(0xe029e991L), 12244000L),
-              new ForkId(Bytes.ofUnsignedInt(0xeb440f6L), 0L),
-              new ForkId(Bytes.ofUnsignedInt(0xeb440f6L), 0L))
+              new ForkId(Bytes.ofUnsignedInt(0xeb440f6L), 12965000),
+              new ForkId(Bytes.ofUnsignedInt(0xb715077dL), 0L),
+              new ForkId(Bytes.ofUnsignedInt(0xb715077dL), 0L))
         },
         new Object[] {
           NetworkName.MORDOR,
diff --git a/config/src/main/resources/mainnet.json b/config/src/main/resources/mainnet.json
index b5fdb922a7d..848cda74912 100644
--- a/config/src/main/resources/mainnet.json
+++ b/config/src/main/resources/mainnet.json
@@ -10,6 +10,7 @@
     "istanbulBlock": 9069000,
     "muirGlacierBlock": 9200000,
     "berlinBlock": 12244000,
+    "londonBlock": 12965000,
     "ethash": {
     }
   },
diff --git a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolScheduleTest.java b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolScheduleTest.java
index 2076c826b27..e227b2bf69e 100644
--- a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolScheduleTest.java
+++ b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/mainnet/MainnetProtocolScheduleTest.java
@@ -45,7 +45,8 @@ public void shouldReturnDefaultProtocolSpecsWhenCustomNumbersAreNotUsed() {
     Assertions.assertThat(sched.getByBlockNumber(9_069_000L).getName()).isEqualTo("Istanbul");
     Assertions.assertThat(sched.getByBlockNumber(9_200_000L).getName()).isEqualTo("MuirGlacier");
     Assertions.assertThat(sched.getByBlockNumber(12_244_000L).getName()).isEqualTo("Berlin");
-    Assertions.assertThat(sched.getByBlockNumber(Long.MAX_VALUE).getName()).isEqualTo("Berlin");
+    Assertions.assertThat(sched.getByBlockNumber(12_965_000L).getName()).isEqualTo("London");
+    Assertions.assertThat(sched.getByBlockNumber(Long.MAX_VALUE).getName()).isEqualTo("London");
   }
 
   @Test