diff --git a/requirements_dev.txt b/requirements_dev.txt
index 5c28b616b49842bc376717e7a65ece2468a760c0..a511aad9d7b7d9ab2e6d885ba48915c49d907b28 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,5 +1,6 @@
 gtfparse
 biopython
+pytest
 black
 flake8
 flake8-docstrings