diff --git a/.github/workflows/build_arduino.yml b/.github/workflows/build_arduino.yml
index 27ead50..7f4da04 100644
--- a/.github/workflows/build_arduino.yml
+++ b/.github/workflows/build_arduino.yml
@@ -52,6 +52,8 @@ jobs:
         - name: arduino:megaavr
         - name: arduino:samd
         - name: arduino:mbed
+        - name: STMicroelectronics:stm32
+          source-url: https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json
       # - name: arduino:sam
     strategy:
       fail-fast: false
@@ -96,6 +98,7 @@ jobs:
           - "arduino:samd:tian"
           - "arduino:megaavr:uno2018"
           # - "arduino:megaavr:nano4809"  # board not found
+          - "STMicroelectronics:stm32:GenF1:pnum=BLUEPILL_F103C8"
         # By default, don't generate size deltas data.
         enable-deltas-report: 
           - false
diff --git a/.github/workflows/build_platformIO.yml b/.github/workflows/build_platformIO.yml
index 656428e..2078214 100644
--- a/.github/workflows/build_platformIO.yml
+++ b/.github/workflows/build_platformIO.yml
@@ -65,4 +65,4 @@ jobs:
         board:
           - "tinypico"
           - "nodemcuv2"
-          - "bluepill_f103c8"
+          # - "bluepill_f103c8"