diff --git a/.github/workflows/modified_scripts_build.yml b/.github/workflows/modified_scripts_build.yml
index aec5deda..8eff5360 100644
--- a/.github/workflows/modified_scripts_build.yml
+++ b/.github/workflows/modified_scripts_build.yml
@@ -40,9 +40,9 @@ jobs:
           #prerequisites
           brew install openssl openssl@1.1 readline sqlite3 xz zlib
           if [[ "${{ matrix.python-version }}" =~ pypy.*-(src|dev) ]]; then
-            pyenv install 2.7.18
-            PYENV_VERSION=2.7.18 pip install pycparser
-            # brew install expat
+            export PYENV_BOOTSTRAP_VERSION=pypy2.7-7
+            echo "PYENV_BOOTSTRAP_VERSION=$PYENV_BOOTSTRAP_VERSION" >> $GITHUB_ENV
+            pyenv install $PYENV_BOOTSTRAP_VERSION
           fi
       - run: |
           #build
@@ -103,9 +103,9 @@ jobs:
             curl llvm libncurses5-dev libncursesw5-dev \
             xz-utils tk-dev libffi-dev liblzma-dev
           if [[ "${{ matrix.python-version }}" =~ pypy.*-(src|dev) ]]; then
-            pyenv install 2.7.18
-            PYENV_VERSION=2.7.18 pip install pycparser
-            # sudo apt install -yq libexpat1-dev
+            export PYENV_BOOTSTRAP_VERSION=pypy2.7-7
+            echo "PYENV_BOOTSTRAP_VERSION=$PYENV_BOOTSTRAP_VERSION" >> $GITHUB_ENV
+            pyenv install $PYENV_BOOTSTRAP_VERSION
           fi
       - run: |
           #build