diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9554b4ed2dce..86843fbfdc19 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ This release contains the activation blocks for London across all supported test
   * Ropsten 10_499_401 (24 Jun 2021)
   * Goerli 5_062_605 (30 Jun 2021)
   * Rinkeby 8_897_988 (7 Jul 2021)
+  * Mainnet 12_965_000 (4 Aug 2021)
 - QBFT is a Byzantine Fault Tolerant consensus algorithm, building on the capabilities of IBFT and IBFT 2.0. It aims to provide performance improvements in cases of excess round change, and provides interoperability with other EEA compliant clients, such as GoQuorum.
   - Note: QBFT currently only supports new networks. Existing networks using IBFT2.0 cannot migrate to QBFT. This will become available in a future release.
   - Note: QBFT is an early access feature pending community feedback. Please make use of QBFT in new development networks and reach out in case of issues or concerns
diff --git a/besu/src/test/java/org/hyperledger/besu/ForkIdsTest.java b/besu/src/test/java/org/hyperledger/besu/ForkIdsTest.java
index 2729cf9703d9..3cb6361f14ba 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 b5fdb922a7df..848cda749120 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 2076c826b27d..e227b2bf69e6 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