diff --git a/setup.py b/setup.py
index 53a862b..7205552 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@
         "numpy>=1.19.2",
         "scipy>=1.5.2",
         "scikit-learn>=0.23.2",
-        "pandas>=1.1.2",
+        "pandas>=1.1.2,<2.0.0",
         "newick~=1.0.0",
         "anndata>=0.7.4",
         "matplotlib>=3.3.1",