diff --git a/CHANGELOG.md b/CHANGELOG.md
index f619ac8e5e9..0b1d05262f8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
   - Fast Sync
 
 ### Additions and Improvements
+- Add Osaka, BPO1 and BPO2 fork times for mainnet [#9380](https://github.com/hyperledger/besu/pull/9380)
 - Add blockTimestamp to receipt logs for `eth_getBlockReceipts` and `eth_getTransactionReceipt` results [#9294](https://github.com/hyperledger/besu/pull/9294)
 - Upgrade to execution-spec-tests v5.3.0 [#9301](https://github.com/hyperledger/besu/pull/9301)
 - Update to netty 4.2.7.Final [#9330](https://github.com/hyperledger/besu/pull/9330)
diff --git a/app/src/test/java/org/hyperledger/besu/ForkIdsNetworkConfigTest.java b/app/src/test/java/org/hyperledger/besu/ForkIdsNetworkConfigTest.java
index 097a6303904..873a468fb2b 100644
--- a/app/src/test/java/org/hyperledger/besu/ForkIdsNetworkConfigTest.java
+++ b/app/src/test/java/org/hyperledger/besu/ForkIdsNetworkConfigTest.java
@@ -115,8 +115,11 @@ public static Collection<Object[]> parameters() {
               new ForkId(Bytes.ofUnsignedInt(0xf0afd0e3L), 1681338455L),
               new ForkId(Bytes.ofUnsignedInt(0xdce96c2dL), 1710338135L),
               new ForkId(Bytes.ofUnsignedInt(0x9f3d2254L), 1746612311L),
-              new ForkId(Bytes.ofUnsignedInt(0xc376cf8bL), 0L),
-              new ForkId(Bytes.ofUnsignedInt(0xc376cf8bL), 0L))
+              new ForkId(Bytes.ofUnsignedInt(0xc376cf8bL), 1764798551),
+              new ForkId(Bytes.ofUnsignedInt(0x5167e2a6L), 1765290071),
+              new ForkId(Bytes.ofUnsignedInt(0xcba2a1c0L), 1767747671),
+              new ForkId(Bytes.ofUnsignedInt(0x07c9462eL), 0),
+              new ForkId(Bytes.ofUnsignedInt(0x07c9462eL), 0))
         },
         new Object[] {
           NetworkName.MORDOR,
diff --git a/config/src/main/resources/mainnet.json b/config/src/main/resources/mainnet.json
index 7c9fb99a01a..3ba94ccf767 100644
--- a/config/src/main/resources/mainnet.json
+++ b/config/src/main/resources/mainnet.json
@@ -20,6 +20,9 @@
     "depositContractAddress": "0x00000000219ab540356cbb839cbe05303d7705fa",
     "withdrawalRequestContractAddress": "0x00000961ef480eb55e80d19ad83579a64c007002",
     "consolidationRequestContractAddress": "0x0000bbddc7ce488642fb579f8b00f3a590007251",
+    "osakaTime": 1764798551,
+    "bpo1Time": 1765290071,
+    "bpo2Time": 1767747671,
     "blobSchedule": {
       "cancun": {
         "target": 3,
@@ -30,6 +33,16 @@
         "target": 6,
         "max": 9,
         "baseFeeUpdateFraction": 5007716
+      },
+      "bpo1": {
+        "target": 10,
+        "max": 15,
+        "baseFeeUpdateFraction": 8346193
+      },
+      "bpo2": {
+        "target": 14,
+        "max": 21,
+        "baseFeeUpdateFraction": 11684671
       }
     },
     "ethash": {
diff --git a/ethereum/referencetests/src/reference-test/java/org/hyperledger/besu/ethereum/mainnet/DifficultyCalculatorTests.java b/ethereum/referencetests/src/reference-test/java/org/hyperledger/besu/ethereum/mainnet/DifficultyCalculatorTests.java
index 127ec43a3af..9eed6337585 100644
--- a/ethereum/referencetests/src/reference-test/java/org/hyperledger/besu/ethereum/mainnet/DifficultyCalculatorTests.java
+++ b/ethereum/referencetests/src/reference-test/java/org/hyperledger/besu/ethereum/mainnet/DifficultyCalculatorTests.java
@@ -54,6 +54,9 @@ public static Stream<Arguments> getTestParametersForConfig() throws IOException
     postMergeOverrides.put("shanghaiTime", "999999999999");
     postMergeOverrides.put("cancunTime","999999999999");
     postMergeOverrides.put("pragueTime","999999999999");
+    postMergeOverrides.put("osakaTime","999999999999");
+    postMergeOverrides.put("bpo1Time","999999999999");
+    postMergeOverrides.put("bpo2Time","999999999999");
     return Stream.of(
         Arguments.of(
             "/BasicTests/difficultyMainNetwork.json",