diff --git a/python/fbprophet/forecaster.py b/python/fbprophet/forecaster.py
index e90835a..a420a5a 100644
--- a/python/fbprophet/forecaster.py
+++ b/python/fbprophet/forecaster.py
@@ -552,7 +552,7 @@ class Prophet(object):
             prior_scales[row.holiday] = ps
 
             for offset in range(lw, uw + 1):
-                occurrence = dt + timedelta(days=offset)
+                occurrence = pd.to_datetime(dt + timedelta(days=offset))
                 try:
                     loc = row_index.get_loc(occurrence)
                 except KeyError:
diff --git a/python/requirements.txt b/python/requirements.txt
index 662ed59..b9c99af 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -2,7 +2,7 @@ Cython>=0.22
 cmdstanpy==0.9.5
 pystan>=2.14
 numpy>=1.10.0
-pandas>=0.23.4,<1.1.0
+pandas>=0.23.4
 matplotlib>=2.0.0
 LunarCalendar>=0.0.9
 convertdate>=2.1.2