diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8941812..7ee4ebb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,6 +29,9 @@ jobs:
            cd circle-stdlib/libs/circle
            git checkout ec09d7e # develop
            cd -
+           cd circle-stdlib/libs/circle-newlib
+           git checkout 48bf91d # needed for circle ec09d7e
+           cd -
     - name: Install toolchains
       run: |
            set -ex