diff --git a/docs/source/_static/custom.css b/docs/source/_static/custom.css
index 81f08ea5..2c7d9875 100644
--- a/docs/source/_static/custom.css
+++ b/docs/source/_static/custom.css
@@ -29,7 +29,6 @@ a.el:visited {
 
 .wy-side-nav-search>div.version {
 	color: #565A5C;
-	# CU dark gray
 }
 
 .wy-nav-content {
diff --git a/src/bsk_rl/gym.py b/src/bsk_rl/gym.py
index 24e4e5ad..024492cd 100644
--- a/src/bsk_rl/gym.py
+++ b/src/bsk_rl/gym.py
@@ -33,8 +33,8 @@ class GeneralSatelliteTasking(Env, Generic[SatObs, SatAct]):
     def __init__(
         self,
         satellites: Union[Satellite, list[Satellite]],
-        scenario: Scenario = Scenario(),
-        rewarder: GlobalReward = NoReward(),
+        scenario: Optional[Scenario] = None,
+        rewarder: Optional[GlobalReward] = None,
         world_type: Optional[type[WorldModel]] = None,
         world_args: Optional[dict[str, Any]] = None,
         communicator: Optional[CommunicationMethod] = None,
@@ -91,6 +91,11 @@ def __init__(
         self.satellites = satellites
         self.simulator: Simulator
 
+        if scenario is None:
+            scenario = Scenario()
+        if rewarder is None:
+            rewarder = NoReward()
+
         if world_type is None:
             world_type = self._minimum_world_model()
         self.world_type = world_type