diff --git a/.github/workflows/action.yml b/.github/workflows/action.yml
index 7bd87a4..3294538 100644
--- a/.github/workflows/action.yml
+++ b/.github/workflows/action.yml
@@ -6,13 +6,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
-        poetry-version: ["1.4.0"]
-        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        poetry-version: ["1.8.5"]
+        os: ["ubuntu-22.04", "macos-latest", "windows-latest"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install poetry
diff --git a/pyproject.toml b/pyproject.toml
index 7c19f63..8a1283c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ repository = "https://github.com/leakix/l9format-python"
 documentation = "https://github.com/leakix/l9format-python"
 
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.9"
 # Updating to 0.9.0 breaks the support of iso8601.
 # The author of serde updated its code to use the stdlib iso8601 support, which
 # does not support for instance: