diff --git a/tox.ini b/tox.ini
index 1b0900bd9..f7befdd1b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -82,7 +82,7 @@ description =
     Run tests on Python 3 with minimum supported versions of astropy, numpy
 basepython = python3.9
 deps =
-    numpy==1.23.5
+    numpy==1.26
     numdifftools==0.9.39
     astropy==4.0.6
     matplotlib==3.4.3