diff --git a/misc/requirements/requirements-tests.txt-raw b/misc/requirements/requirements-tests.txt-raw
index ab580ac4b37..cfc98b3e361 100644
--- a/misc/requirements/requirements-tests.txt-raw
+++ b/misc/requirements/requirements-tests.txt-raw
@@ -11,6 +11,9 @@ pytest-mock
 pytest-qt
 pytest-rerunfailures
 
+## WORKAROUND for https://github.com/Bachmann1234/diff_cover/issues/249
+pluggy<1.0.0
+
 ## optional:
 # To test :debug-trace, gets skipped if hunter is not installed
 hunter