diff --git a/requirements.txt b/requirements.txt
index 5e1531f..6492fa1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,5 @@ mdanalysis
 pandas
 dask
 pathos
-tables
\ No newline at end of file
+tables
+pytest
\ No newline at end of file