diff --git a/setup.cfg b/setup.cfg
index fb93957b..22958997 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -95,7 +95,7 @@ testing =
     matplotlib~=3.3.0
     numpy
     # TODO: 1.4.0 has some warnings that need to be fixed in the tests.
-    pandas~=1.3.5
+    pandas<1.4
     pytest~=5.4
     pytest-cov~=2.8
     pytest-regressions