diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 436de42a6..12dce4e24 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -37,14 +37,17 @@ jobs:
           - "ubuntu-py37"
           - "ubuntu-py38"
           - "ubuntu-py39"
+          - "ubuntu-py310"
 
           - "macos-py37"
           - "macos-py38"
           - "macos-py39"
+          - "macos-py310"
 
           - "windows-py37"
           - "windows-py38"
           - "windows-py39"
+          - "windows-py310"
 
         include:
           - name: "ubuntu-py37"
@@ -59,6 +62,10 @@ jobs:
             python: "3.9"
             os: ubuntu-latest
             tox_env: "py39"
+          - name: "ubuntu-py310"
+            python: "3.10"
+            os: ubuntu-latest
+            tox_env: "py310"
 
           - name: "macos-py37"
             python: "3.7"
@@ -72,6 +79,10 @@ jobs:
             python: "3.9"
             os: macos-latest
             tox_env: "py39"
+          - name: "macos-py310"
+            python: "3.10"
+            os: macos-latest
+            tox_env: "py310"
 
           - name: "windows-py37"
             python: "3.7"
@@ -85,6 +96,10 @@ jobs:
             python: "3.9"
             os: windows-latest
             tox_env: "py39"
+          - name: "windows-py310"
+            python: "3.10"
+            os: windows-latest
+            tox_env: "py310"
 
     steps:
       - uses: actions/checkout@v2
diff --git a/cookiecutter/cli.py b/cookiecutter/cli.py
index 84241ac2a..6b3c583ad 100644
--- a/cookiecutter/cli.py
+++ b/cookiecutter/cli.py
@@ -25,7 +25,7 @@
 
 def version_msg():
     """Return the Cookiecutter version, location and Python powering it."""
-    python_version = sys.version[:3]
+    python_version = sys.version
     location = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
     message = 'Cookiecutter %(version)s from {} (Python {})'
     return message.format(location, python_version)
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 623945e8b..19740ef26 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -4,6 +4,7 @@
 import os
 import re
 
+
 import pytest
 from click.testing import CliRunner
 
@@ -48,7 +49,7 @@ def version_cli_flag(request):
 
 
 def test_cli_version(cli_runner, version_cli_flag):
-    """Verify correct version output by `cookiecutter` on cli invocation."""
+    """Verify Cookiecutter version output by `cookiecutter` on cli invocation."""
     result = cli_runner(version_cli_flag)
     assert result.exit_code == 0
     assert result.output.startswith('Cookiecutter')
diff --git a/tox.ini b/tox.ini
index 591fc50ee..b8dd5c5e1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@ envlist =
     py37
     py38
     py39
+    py310
 minversion = 3.14.2
 requires =
     virtualenv >= 20.4.5