diff --git a/test-requirements.txt b/test-requirements.txt
index 25ffe0a..66d3f9f 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,3 +1,3 @@
 pytest==5.2.1
-pytest-cov
+pytest-cov==2.8.1
 hypothesis