diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 43c3d7c..aca1a64 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     name: ${{ matrix.os }} python ${{ matrix.python-version }}
     runs-on: ${{ matrix.os }}
-    if: "!contains(github.event.head_commit.message, 'ci skip') && !contains(github.event.head_commit.message, 'skip ci')"
+    if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
     strategy:
       fail-fast: false
       matrix:
@@ -72,7 +72,7 @@ jobs:
       - name: Bump version
         shell: bash
         run: |
-          export version_bump_rule=$(echo ${{ github.event.head_commit.message }} | python .github/scripts/parse_bump_rule.py )
+          export version_bump_rule=$(echo '${{ github.event.head_commit.message }}' | python .github/scripts/parse_bump_rule.py )
           echo "version_bump_rule: '${version_bump_rule}'"
           python -m poetry version "${version_bump_rule}"
           export new_version=$(python .github/scripts/parse_version.py pyproject.toml)
diff --git a/pyproject.toml b/pyproject.toml
index c340a76..00b3834 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,5 +41,5 @@ junit_family="xunit2"
 addopts = "-v --tb=short --doctest-glob='' --cov --cov-branch --cov-report xml"
 
 [build-system]
-requires = ["poetry-core>=1.0.10"]
+requires = ["poetry-core>=1.0.0a9"]
 build-backend = "poetry.core.masonry.api"