diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 2dae04e..afb0b1c 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -2,7 +2,7 @@ name: Build
 on: [push]
 
 env:
-  MATRIX_RUNNERS: 8  # do not saturate runner pool
+  MATRIX_RUNNERS: 12  # do not saturate runner pool
 
 jobs:
 
@@ -85,8 +85,6 @@ jobs:
           cd zephyrproject/zephyr
           pip3 -q install -r scripts/requirements.txt
           cd ..
-          west config manifest.group-filter -- +ci,+optional
-          west update
           west zephyr-export
           cd ..
 
diff --git a/configs/tensorflow_lite_micro.conf b/configs/tensorflow_lite_micro.conf
index fd5d678..f35f8ee 100644
--- a/configs/tensorflow_lite_micro.conf
+++ b/configs/tensorflow_lite_micro.conf
@@ -1,8 +1,5 @@
 # original config
-CONFIG_CPLUSPLUS=y
-CONFIG_LIB_CPLUSPLUS=y
-CONFIG_NEWLIB_LIBC=y
+CONFIG_CPP=y
+CONFIG_STD_CPP17=y
 CONFIG_TENSORFLOW_LITE_MICRO=y
-
-# additional config
-CONFIG_NEWLIB_LIBC_NANO=y
+CONFIG_MAIN_STACK_SIZE=2048
diff --git a/scripts/prepare_sources.sh b/scripts/prepare_sources.sh
index 133a51c..882aa69 100755
--- a/scripts/prepare_sources.sh
+++ b/scripts/prepare_sources.sh
@@ -36,6 +36,7 @@ wait
 # Zephyrproject setup
 west init -l zephyrproject/zephyr
 cd zephyrproject
+west config manifest.group-filter -- +ci,+optional
 
 for i in $(seq 1 5)
 do