diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index d8fee52..5f0d3ac 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -44,6 +44,7 @@ jobs:
           python -m pip install --upgrade pip
           pip install .
           pip install pytest
+          pip list
 
       - name: run the check by pytest
         run: |
diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
new file mode 100644
index 0000000..da706d5
--- /dev/null
+++ b/.github/workflows/tox.yml
@@ -0,0 +1,39 @@
+name: CI_tox_appendfilename
+
+# name    : tox.yml
+# purpose : run pytest on appendfilename
+# date    : [2026-05-13 Wed]
+# edit    :
+
+on:
+  workflow_dispatch:  # the manual trigger
+  # push:
+    # branches: [ dev, main ]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
+
+    steps:
+    - uses: actions/checkout@v5
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v6
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install tox
+      run: |
+        python -m pip install --upgrade pip
+        pip install .
+        pip install pytest
+        pip install tox tox-gh-actions
+        pip list
+
+    - name: run tox' jobs (which GitHub happens to split in separate jobs)
+      run: tox
+
diff --git a/license.txt b/LICENSE
similarity index 100%
rename from license.txt
rename to LICENSE
diff --git a/pyproject.toml b/pyproject.toml
index b79bfa7..7250125 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,6 +2,7 @@
 [project]
 name = "appendfilename"
 version = "2026.03.01.1"
+requires-python = ">=3.10"
 description = "Intelligent appending text to file names, considering file extensions and file tags"
 license = "GPL-3.0-or-later"
 readme = { file = "README.org", content-type = "text/plain" }
@@ -17,13 +18,22 @@ keywords = [
     "time",
     "time-stamps"
 ]
+
+# https://pypi.org/classifiers/
 classifiers = [
-    "Programming Language :: Python :: 3 :: Only",
     "Development Status :: 5 - Production/Stable",
     "Environment :: Console",
     "Intended Audience :: End Users/Desktop",
-    "Operating System :: OS Independent"
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
 ]
+
 dependencies = [
     "pyreadline3>=3.5.4",
 ]
@@ -34,7 +44,7 @@ dependencies = [
 Homepage = "https://github.com/novoid/appendfilename"
 
 [project.scripts]
-guessfilename = "appendfilename:main"
+appendfilename = "appendfilename:main"
 
 [[tool.uv.index]]
 name = "appendfilename"
@@ -52,3 +62,17 @@ build-backend = "setuptools.build_meta"
 [tool.mypy]
 strict = true
 ignore_missing_imports = true
+
+[tool.pytest]
+minversion = "9.0"
+addopts = ["-ra"]
+strict = true
+testpaths = [
+  "tests"
+]
+markers = [
+  "default:        test appendfilename's default string insertion",
+  "prepend:        test appendfilename's optional -p/--prepend flag",
+  "smart_prepend:  test appendfilename's optional --smart-prepend flag",
+]
+
diff --git a/pytest.ini b/pytest.ini
deleted file mode 100644
index f986737..0000000
--- a/pytest.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[pytest]
-markers =
-    default:        test appendfilename's default string insertion
-    prepend:        test appendfilename's optional -p/--prepend flag
-    smart_prepend:  test appendfilename's optional --smart-prepend flag
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..349f964
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,11 @@
+[tox]
+envlist = py310, py311, py312, py313, py314
+isolated_build = True
+ignore_missing_interpreters = True
+
+[testenv]
+deps =
+  pytest
+commands =
+  pytest
+
diff --git a/uv.lock b/uv.lock
index 21015ca..deeaf87 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,11 +1,11 @@
 version = 1
 revision = 3
-requires-python = ">=3.13"
+requires-python = ">=3.10"
 
 [[package]]
 name = "appendfilename"
-version = "2025.5.14"
-source = { virtual = "." }
+version = "2026.3.1.1"
+source = { editable = "." }
 dependencies = [
     { name = "pyreadline3" },
 ]