diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8878bb54..eeb64afa 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -54,6 +54,7 @@ jobs:
     name: Python ${{ matrix.python-version}} on ${{ matrix.os }}${{ fromJSON('[" (extras)", ""]')[matrix.extras == ''] }}
     needs: lint
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 30
     strategy:
       matrix:
         python-version: [3.11, 3.12, 3.13, 3.14, 3.15]
@@ -80,11 +81,7 @@ jobs:
         id: run-pytests-with-code-coverage
         shell: bash
         run: |
-          if [[ "${{ runner.os }}" == "Windows" ]]; then
-            uv run pytest -n0 --cov kasa --cov-report xml
-          else
-            uv run pytest -n auto --cov kasa --cov-report xml
-          fi
+          uv run pytest -n auto --cov kasa --cov-report xml
 
       - name: Upload Code Coverage to Codecov
         id: upload-code-coverage-to-codecov
diff --git a/pyproject.toml b/pyproject.toml
index 65ca5e12..f048c8a1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -114,7 +114,10 @@ markers = [
     "requires_dummy: test requires dummy data to pass, skipped on real devices",
 ]
 asyncio_mode = "auto"
-asyncio_default_fixture_loop_scope = "function"
+# One event loop for the run, not one per test: on Windows each loop opens a
+# loopback TCP connection, and thousands of them use up the dynamic ports.
+asyncio_default_fixture_loop_scope = "session"
+asyncio_default_test_loop_scope = "session"
 #timeout = 10
 # dist=loadgroup enables grouping of tests into single worker.
 # required as caplog doesn't play nicely with multiple workers.