diff --git a/src/primaite/game/agent/observations/host_observations.py b/src/primaite/game/agent/observations/host_observations.py
index 96c5f40d..617e8eee 100644
--- a/src/primaite/game/agent/observations/host_observations.py
+++ b/src/primaite/game/agent/observations/host_observations.py
@@ -57,27 +57,6 @@ class HostObservation(AbstractObservation, identifier="HOST"):
         include_users: Optional[bool] = True
         """If True, report user session information."""
 
-        # @field_validator("monitored_traffic", mode="before")
-        # def traffic_lookup(cls, val: Optional[Dict]) -> Optional[Dict]:
-        #     """
-        #     Convert monitored_traffic by lookup against Port and Protocol dicts.
-
-        #     This is necessary for retaining compatiblility with configs written for PrimAITE <=3.3.
-        #     This method will be removed in PrimAITE >= 4.0
-        #     """
-        #     if val is None:
-        #         return val
-        #     new_val = {}
-        #     for proto, port_list in val.items():
-        #         # convert protocol, for instance ICMP becomes "icmp"
-        #         proto = PROTOCOL_LOOKUP[proto] if proto in PROTOCOL_LOOKUP else proto
-        #         new_val[proto] = []
-        #         for port in port_list:
-        #             # convert ports, for instance "HTTP" becomes 80
-        #             port = PORT_LOOKUP[port] if port in PORT_LOOKUP else port
-        #             new_val[proto].append(port)
-        #     return new_val
-
     def __init__(
         self,
         where: WhereType,