diff --git a/laborious/activities/gates.py b/laborious/activities/gates.py
index 528c872..08f4f02 100644
--- a/laborious/activities/gates.py
+++ b/laborious/activities/gates.py
@@ -416,17 +416,17 @@ class Gates(BaseActivity):
             data['timestamp'] = input_data['timestamp']
         else:
             self.debug(
-                f"Data has timestamp, sorting data by timestamp", metadata)
+                "Data has timestamp, sorting data by timestamp", metadata)
 
             # If policy_type is lts, we need to sort the data by timestamp descending and take the first policy_value rows
             if policy_type == 'lts':
                 self.debug(
-                    f"Sorting data by timestamp descending", metadata)
+                    "Sorting data by timestamp descending", metadata)
                 data = data.sort_values(by='timestamp', ascending=False)
             # If policy_type is erl, we need to sort the data by timestamp ascending and take the first policy_value rows
             elif policy_type == 'erl':
                 self.debug(
-                    f"Sorting data by timestamp ascending", metadata)
+                    "Sorting data by timestamp ascending", metadata)
                 data = data.sort_values(by='timestamp', ascending=True)
             else:
                 self.error(