diff --git a/.coveragerc b/.coveragerc
index 8bdacb69..537f4767 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -1,6 +1,8 @@
 [run]
 branch = True
-source = src
+source =
+    src
+    tests
 omit =
     */conftest.py
     */test_*_fuzz.py
@@ -15,6 +17,7 @@ exclude_lines =
     pragma: no cover
     except ImportError:
     \# Python <
+    sys\.version_info <
     raise NotImplementedError
     raise TypeError\(f?"Unexpected
     assert False,
@@ -23,4 +26,5 @@ exclude_lines =
     if TYPE_CHECKING:
     ^\s+\.\.\.$
     ^\s+pass$
+    \: \.\.\.$
 ignore_errors = True
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f626f16c..c9ec84c5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', 'pypy3.9', 'pypy3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', 'pypy3.9', 'pypy3.10']
 
     steps:
       - uses: actions/checkout@v4
@@ -21,7 +21,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install tox tox-gh-actions
+          pip install "tox>=3.28,<5" "tox-gh-actions>=2.12,<4"
 
       - name: Run unit tests with tox
         run: tox
diff --git a/tox.ini b/tox.ini
index 785aadc0..0e09ab95 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@ isolated_build = true
 
 [gh-actions]
 python =
-    3: py310
+    3: py311
     3.6: py36
     3.7: py37
     3.8: py38
@@ -12,6 +12,7 @@ python =
     3.10: py310
     3.11: py311
     3.12: py312
+    pypy3: pypy39
     pypy3.9: pypy39
     pypy3.10: pypy310