diff --git a/pyproject.toml b/pyproject.toml
index a3dc4cb..fe90d41 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ ics = "^0.7.2"
 xlrd = "^2.0.1"
 xlwt = "^1.3.0"
 openpyxl = "^3.1.2"
-pandas = "2.1.1"
+pandas = "^2.1.1"