diff --git a/pymc/step_methods/metropolis.py b/pymc/step_methods/metropolis.py
index c042bc1f3d..23a7ef8a9f 100644
--- a/pymc/step_methods/metropolis.py
+++ b/pymc/step_methods/metropolis.py
@@ -695,9 +695,7 @@ class CategoricalGibbsMetropolis(ArrayStep):
 
     name = "categorical_gibbs_metropolis"
 
-    stats_dtypes_shapes = {
-        "tune": (bool, []),
-    }
+    stats_dtypes_shapes = {}
 
     _state_class = CategoricalGibbsMetropolisState
 
@@ -793,7 +791,7 @@ def astep_unif(self, apoint: RaveledVars, *args) -> tuple[RaveledVars, StatsType
                 logp_curr = logp_prop
 
         # This step doesn't have any tunable parameters
-        return q, [{"tune": False}]
+        return q, [{}]
 
     def astep_prop(self, apoint: RaveledVars, *args) -> tuple[RaveledVars, StatsType]:
         logp = args[0]