diff --git a/requirements.txt b/requirements.txt
index 2dd71a1..d1c0c7e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 pandas == 1.4.2
 numpy == 1.22.4
 scipy == 1.8.1
-pysand == 1.7.7
+pysand == 1.7.8
 flask == 2.1.1
 bootstrap-flask == 2.0.2
 wtforms == 3.0.1