diff --git a/requirements.txt b/requirements.txt
index 52e0c94..db89e34 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,7 @@
 GitPython==3.1.40
-matplotlib==3.8.2
-numpy==1.26.2
-scipy==1.11.4
+matplotlib==3.8.2 ; python_version >= '3.9'
+matplotlib==3.3.4 ; python_version < '3.9'
+numpy==1.26.2 ; python_version >= '3.9'
+numpy==1.19.5 ; python_version < '3.9'
+scipy==1.11.4 ; python_version >= '3.9'
+scipy==1.7.3 ; python_version < '3.9'