diff --git a/changehc/delphi_changehc/update_sensor.py b/changehc/delphi_changehc/update_sensor.py
index a91dec5ac..edae85517 100644
--- a/changehc/delphi_changehc/update_sensor.py
+++ b/changehc/delphi_changehc/update_sensor.py
@@ -200,14 +200,17 @@ def update_sensor(self,
         data.reset_index(inplace=True)
         data_frame = self.geo_reindex(data)
         # handle if we need to adjust by weekday
-        wd_params = Weekday.get_params(
-            data_frame,
-            "den",
-            ["num"],
-            Config.DATE_COL,
-            [1, 1e5],
-            self.logger,
-        ) if self.weekday else None
+        if self.weekday:
+            wd_params = Weekday.get_params_legacy(
+                data_frame,
+                "den",
+                ["num"],
+                Config.DATE_COL,
+                [1, 1e5],
+                self.logger,
+            )
+        else:
+            wd_params = None
         # run sensor fitting code (maybe in parallel)
         if not self.parallel:
             dfs = []
diff --git a/changehc/setup.py b/changehc/setup.py
index 1faebb6a5..d95beb771 100644
--- a/changehc/setup.py
+++ b/changehc/setup.py
@@ -15,6 +15,7 @@
     "pylint==2.8.3",
     "pytest-cov",
     "pytest",
+    "cvxpy<1.6",
 ]
 
 setup(