1 files changed, 9 insertions, 2 deletions
diff --git a/tox.ini b/tox.ini
index f4ebc022..03125fd2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,8 +15,15 @@ deps =
     -r requirements/pytest.pip
     pip==19.3.1
     setuptools==41.4.0
-    # gevent 1.3 causes a failure: https://github.com/nedbat/coveragepy/issues/663
-    py{27,35,36}: gevent==1.2.2
+
+    # For testing https://github.com/nedbat/coveragepy/issues/841
+    # Use this command:
+    #   COVERAGE_NO_PYTRACER=1 tox -e py36 -- -vv -k test_gevent -n 0
+    #
+    #   1.3a2 works
+    #   1.3b1 doesn't work
+    py{27,35,36}: gevent==1.3b1
+
     py{27,35,36,37,38}: eventlet==0.25.1
     py{27,35,36,37,38}: greenlet==0.4.15