diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 00000000..17b79984
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,26 @@
+[run]
+branch = True
+
+[report]
+; Regexes for lines to exclude from consideration
+exclude_also =
+    ; Don't complain about missing debug-only code:
+    def __repr__
+    if self\.debug
+
+    ; Don't complain if tests don't hit defensive assertion code:
+    raise AssertionError
+    raise NotImplementedError
+
+    ; Don't complain if non-runnable code isn't run:
+    if 0:
+    if __name__ == .__main__.:
+
+    ; Don't complain about abstract methods, they aren't run:
+    @(abc\.)?abstractmethod
+
+ignore_errors = True
+
+omit =
+    "tests/*"
+    "docs/*"
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5f46a199..418370d2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -22,7 +22,7 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}