diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 45297ff..65dfa26 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -14,10 +14,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Update version.py
-        run: |
-          echo "__version__ = '${GITHUB_REF#refs/tags/v}'" > bacs/version.py
-
       - name: set up Python
         uses: actions/setup-python@v5
         with:
@@ -26,12 +22,14 @@ jobs:
       - name: set up Poetry
         uses: abatilo/actions-poetry@v2
 
-      - name: get version
+      - name: Get version
         id: get_version
-        run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
+        run: echo "VERSION=$(echo ${GITHUB_REF/refs\/tags\//})" >> $GITHUB_ENV
 
-      - name: set version
-        run: poetry version ${{ steps.get_version.outputs.VERSION }}
+      - name: Set version
+        run: |
+          VERSION=${{ env.VERSION }}
+          poetry version ${VERSION#v}
 
       - name: publish
         env:
@@ -49,9 +47,6 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ github.token }}
 
-      - name: Update version in pyproject.toml
-        run: python .github/workflows/update_pyproject.py $(echo ${GITHUB_REF/refs\/tags\//})
-
       - name: Commit and push changes
         run: |
           git config --global user.name "github-actions[bot]"
diff --git a/.github/workflows/update_pyproject.py b/.github/workflows/update_pyproject.py
deleted file mode 100755
index a731a8c..0000000
--- a/.github/workflows/update_pyproject.py
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/usr/bin/env python3
-import re
-import sys
-from pathlib import Path
-
-if __name__ == '__main__':
-    path = Path('pyproject.toml')
-    content = path.read_text(encoding='utf-8')
-    version = sys.argv[1].removeprefix('v')
-    content = re.sub(r'version = "[0-9]+\.[0-9]+\.[0-9]+-dev"', f'version = "{version}-dev"', content)
-    path.write_text(content, encoding='utf-8')