diff --git a/.github/workflows/IDFBuild.yml b/.github/workflows/IDFBuild.yml
index 1563e940..6f3a7bfb 100644
--- a/.github/workflows/IDFBuild.yml
+++ b/.github/workflows/IDFBuild.yml
@@ -27,7 +27,7 @@ jobs:
 
         esp-idf-fqbn:
           - esp32@v4.1
-          - esp32@v4.2
+          - esp32@v4.2.1
           - esp32@v4.3.1
           - esp32s2@v4.4.4
           - esp32s3@v4.4.4
@@ -40,7 +40,7 @@ jobs:
 
         include:
           - { esp-idf-fqbn: esp32@v4.1,         idf-board: esp32,   idf-version: v4.1 }
-          - { esp-idf-fqbn: esp32@v4.2,         idf-board: esp32,   idf-version: v4.2 }
+          - { esp-idf-fqbn: esp32@v4.2.1,       idf-board: esp32,   idf-version: v4.2.1 }
           - { esp-idf-fqbn: esp32@v4.3.1,       idf-board: esp32,   idf-version: v4.3.1 }
           - { esp-idf-fqbn: esp32s2@v4.4.4,     idf-board: esp32s2, idf-version: v4.4.4 }
           - { esp-idf-fqbn: esp32s3@v4.4.4,     idf-board: esp32s3, idf-version: v4.4.4 }