diff --git a/requirements.txt b/requirements.txt
index e55063d7..544580b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@ h5py
 numpy>=1.20
 pluggy < 1.4
 psutil
+pytest < 8.0.0
 PyYAML
 scipy
 skyfield>=1.31