diff --git a/setup.py b/setup.py
index ed19e05840db935031fdad11dd3af2dc389fd59f..c579bccf1aef27680dc23fa8291390b68923fcb6 100644
--- a/setup.py
+++ b/setup.py
@@ -93,7 +93,7 @@ setup(name="loo.py",
           "pymbolic>=2019.1",
           "genpy>=2016.1.2",
           "cgen>=2016.1",
-          "islpy>=2016.2",
+          "islpy>=2019.1",
           "six>=1.8.0",
           "codepy>=2017.1",
           "colorama",