diff --git a/.github/workflows/check-yaml-task.yml b/.github/workflows/check-yaml-task.yml
index 865c6e9..def1d5a 100644
--- a/.github/workflows/check-yaml-task.yml
+++ b/.github/workflows/check-yaml-task.yml
@@ -101,7 +101,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v5
         with:
-          python-version: ${{ env.PYTHON_VERSION }}
+          python-version-file: pyproject.toml
 
       - name: Install Poetry
         run: pip install poetry
diff --git a/.github/workflows/spell-check-task.yml b/.github/workflows/spell-check-task.yml
index e00c308..82b0ef2 100644
--- a/.github/workflows/spell-check-task.yml
+++ b/.github/workflows/spell-check-task.yml
@@ -55,7 +55,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v5
         with:
-          python-version: ${{ env.PYTHON_VERSION }}
+          python-version-file: pyproject.toml
 
       - name: Install Poetry
         run: pip install poetry
diff --git a/poetry.lock b/poetry.lock
index 17c720e..d0e0138 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -90,5 +90,5 @@ dev = ["doc8", "flake8", "flake8-import-order", "rstcheck[sphinx]", "sphinx"]
 
 [metadata]
 lock-version = "2.1"
-python-versions = "^3.9"
-content-hash = "da8be4c90085fa15fedd5bb0e4ee4dccb4ffb0cf940408eded81687725fa5d18"
+python-versions = "~3.9"
+content-hash = "37fd99b9473823b2fac53ff63add91780c55e5a808238623237aba46c8d58f58"
diff --git a/pyproject.toml b/pyproject.toml
index e63d27c..57fc029 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ description = ""
 authors = []
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = "~3.9"
 
 [tool.poetry.dev-dependencies]
 yamllint = "^1.36.0"