diff --git a/tests/requirements.txt b/tests/requirements.txt
index 78f16f4..c17b48e 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,4 +1,6 @@
 audiofile
+# To avoid https://github.com/tholo/pytest-flake8/issues/87
+flake8 <5.0.0
 pytest
 pytest-cov
 pytest-doctestplus