diff --git a/.github/workflows/main_matrix.yml b/.github/workflows/main_matrix.yml
index db210721..b70f6941 100644
--- a/.github/workflows/main_matrix.yml
+++ b/.github/workflows/main_matrix.yml
@@ -22,6 +22,7 @@ jobs:
   check:
     strategy:
       fail-fast: false
+      max-parallel: 2
       matrix:
         include:
           - board: rak11200
@@ -157,6 +158,7 @@ jobs:
   build-nrf52:
     strategy:
       fail-fast: false
+      max-parallel: 2
       matrix:
         include: 
           - board: rak4631_5005