diff --git a/.coverage b/.coverage
deleted file mode 100644
index 8c9263a7..00000000
Binary files a/.coverage and /dev/null differ
diff --git a/.gitignore b/.gitignore
index 7c8df477..ea3af9fe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,10 @@ dist/
 build/
 *.egg-info/
 
+# Coverage data: rewritten by every test run, never shared
+.coverage
+.coverage.*
+
 # Chock runtime outputs
 optimization-log.yaml
 rejected-edits/