diff --git a/deps/dockers/etb-all-clients_mainnet_dencun.Dockerfile b/deps/dockers/etb-all-clients_mainnet_dencun.Dockerfile
index 1c7ff31..4737502 100644
--- a/deps/dockers/etb-all-clients_mainnet_dencun.Dockerfile
+++ b/deps/dockers/etb-all-clients_mainnet_dencun.Dockerfile
@@ -39,7 +39,7 @@ ARG BEACON_METRICS_GAZER_BRANCH="11b4b5491da1e451c7f664a64a6ab57231f45714"
 
 # Mock builder for testing builder API
 ARG MOCK_BUILDER_REPO="https://github.com/marioevz/mock-builder.git"
-ARG MOCK_BUILDER_BRANCH="v1.1.0"
+ARG MOCK_BUILDER_BRANCH="08b59e94319013db4bf98e8302ab6ac3b5eac6c2"
 
 ARG ASSERTOR_REPO="https://github.com/ethpandaops/assertoor"
 ARG ASSERTOR_BRANCH="f9a09b7c8e236dc1550a9cd290e4d367bc1c2efa"
diff --git a/deps/launchers/cl/launch-lighthouse.sh b/deps/launchers/cl/launch-lighthouse.sh
index ab65a02..5982cb2 100755
--- a/deps/launchers/cl/launch-lighthouse.sh
+++ b/deps/launchers/cl/launch-lighthouse.sh
@@ -105,7 +105,7 @@ mock_builder_args=(
   --el-rpc-port $EXECUTION_HTTP_PORT
   --extra-data "mock-builder"
   --log-level "info"
-  --get-payload-delay-ms 100
+  --get-payload-delay-ms 300
   --bid-multiplier 5
   --port 18550
   --client-init-timeout 60    
diff --git a/deps/launchers/cl/launch-nimbus.sh b/deps/launchers/cl/launch-nimbus.sh
index b3cd920..0a00ecc 100755
--- a/deps/launchers/cl/launch-nimbus.sh
+++ b/deps/launchers/cl/launch-nimbus.sh
@@ -80,7 +80,7 @@ mock_builder_args=(
   --el-rpc-port $EXECUTION_HTTP_PORT
   --extra-data "mock-builder"
   --log-level "info"
-  --get-payload-delay-ms 100
+  --get-payload-delay-ms 300
   --bid-multiplier 5
   --port 18550
   --client-init-timeout 60    
diff --git a/deps/launchers/cl/launch-prysm.sh b/deps/launchers/cl/launch-prysm.sh
index 05f6257..3a6017c 100755
--- a/deps/launchers/cl/launch-prysm.sh
+++ b/deps/launchers/cl/launch-prysm.sh
@@ -111,7 +111,7 @@ mock_builder_args=(
   --el-rpc-port $EXECUTION_HTTP_PORT
   --extra-data "mock-builder"
   --log-level "info"
-  --get-payload-delay-ms 100
+  --get-payload-delay-ms 300
   --bid-multiplier 5
   --port 18550
   --client-init-timeout 60