From a701f07f3acea58642a255a3e2cb3cdaf21eaa82 Mon Sep 17 00:00:00 2001
From: terence <terence@prysmaticlabs.com>
Date: Fri, 4 Jul 2025 08:58:32 -0700
Subject: [PATCH] Increase mainnet default builder gas limit to 45M (#15455)

---
 changelog/tt_45.md                                             | 3 +++
 config/params/mainnet_config.go                                | 2 +-
 .../testdata/good-prepare-beacon-proposer-config-multiple.json | 2 +-
 .../loader/testdata/good-prepare-beacon-proposer-config.yaml   | 2 +-
 4 files changed, 6 insertions(+), 3 deletions(-)
 create mode 100644 changelog/tt_45.md

diff --git a/changelog/tt_45.md b/changelog/tt_45.md
new file mode 100644
index 0000000000..3aba907c36
--- /dev/null
+++ b/changelog/tt_45.md
@@ -0,0 +1,3 @@
+### Changed
+
+- Increase mainnet DefaultBuilderGasLimit from 36M to 45M
\ No newline at end of file
diff --git a/config/params/mainnet_config.go b/config/params/mainnet_config.go
index 50b3032ab9..15773bb818 100644
--- a/config/params/mainnet_config.go
+++ b/config/params/mainnet_config.go
@@ -268,7 +268,7 @@ var mainnetBeaconConfig = &BeaconChainConfig{
 	BytesPerLogsBloom:                256,
 	MaxExtraDataBytes:                32,
 	EthBurnAddressHex:                "0x0000000000000000000000000000000000000000",
-	DefaultBuilderGasLimit:           uint64(36000000),
+	DefaultBuilderGasLimit:           uint64(45000000),
 
 	// Mevboost circuit breaker
 	MaxBuilderConsecutiveMissedSlots: 3,
diff --git a/config/proposer/loader/testdata/good-prepare-beacon-proposer-config-multiple.json b/config/proposer/loader/testdata/good-prepare-beacon-proposer-config-multiple.json
index b255d4b1ef..a290f98eb0 100644
--- a/config/proposer/loader/testdata/good-prepare-beacon-proposer-config-multiple.json
+++ b/config/proposer/loader/testdata/good-prepare-beacon-proposer-config-multiple.json
@@ -4,7 +4,7 @@
       "fee_recipient": "0x50155530FCE8a85ec7055A5F8b2bE214B3DaeFd3",
       "builder": {
         "enabled": true,
-        "gas_limit": "36000000"
+        "gas_limit": "45000000"
       }
     },
     "0xb057816155ad77931185101128655c0191bd0214c201ca48ed887f6c4c6adf334070efcd75140eada5ac83a92506dd7b": {
diff --git a/config/proposer/loader/testdata/good-prepare-beacon-proposer-config.yaml b/config/proposer/loader/testdata/good-prepare-beacon-proposer-config.yaml
index fd02133c1b..5585d913d2 100644
--- a/config/proposer/loader/testdata/good-prepare-beacon-proposer-config.yaml
+++ b/config/proposer/loader/testdata/good-prepare-beacon-proposer-config.yaml
@@ -9,4 +9,4 @@ default_config:
   fee_recipient: '0x6e35733c5af9B61374A128e6F85f553aF09ff89A'
   builder:
     enabled: false
-    gas_limit: '36000000'
\ No newline at end of file
+    gas_limit: '45000000'
\ No newline at end of file