diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b2979dc..e9b0b8c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,21 +29,37 @@ jobs:
         run: ruff format --check .
 
   test:
-    runs-on: ubuntu-latest
-    name: Tests (py${{ matrix.python }})
+    runs-on: ${{ matrix.os }}
+    name: Tests (py${{ matrix.python }} / ${{ matrix.os }})
     strategy:
       fail-fast: false
       matrix:
-        python: ["3.10", "3.12"]
+        os: [ubuntu-latest]
+        python: ["3.10", "3.12", "3.13"]
+        include:
+          # Windows tests on 3.12 only — the version the release binaries ship
+          # with. The self-hosted Windows runner blocks setup-python's install
+          # script (PowerShell execution policy), so it uses the host's `py`
+          # launcher + venv, same as release.yml.
+          - os: windows-latest
+            python: "3.12"
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up Python ${{ matrix.python }}
+      - name: Set up Python ${{ matrix.python }} (Linux)
+        if: runner.os == 'Linux'
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
 
+      - name: Set up Python venv (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          py -${{ matrix.python }} -m venv .venv
+          Add-Content -Path $env:GITHUB_PATH -Value "$env:GITHUB_WORKSPACE\.venv\Scripts"
+
       # bcc_core has no GUI imports, so the test suite needs no PySide6 —
       # keeps CI fast and avoids Qt system-library headaches on the runner.
       - name: Install test dependencies
diff --git a/tests/test_core.py b/tests/test_core.py
index b07db51..3705811 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -227,8 +227,11 @@ def test_diagnostics_redacts_token_args():
 # --------------------------------------------------------------------------- #
 # 6. Dependency / PATH checking
 # --------------------------------------------------------------------------- #
-def test_dep_check_finds_python3():
-    assert c.check_dependency({"command": "python3"})["status"] == "ok"
+def test_dep_check_finds_python():
+    # "python3" does not exist on a stock Windows install; "warn" (found only
+    # on an augmented PATH) still proves resolution works on a real machine.
+    cmd = "python" if os.name == "nt" else "python3"
+    assert c.check_dependency({"command": cmd})["status"] in ("ok", "warn")
 
 
 def test_dep_check_flags_missing():