diff --git a/crates/ml/src/hyperopt/adapters/dqn.rs b/crates/ml/src/hyperopt/adapters/dqn.rs
index bcf736441..364c99633 100644
--- a/crates/ml/src/hyperopt/adapters/dqn.rs
+++ b/crates/ml/src/hyperopt/adapters/dqn.rs
@@ -486,7 +486,7 @@ impl ParameterSpace for DQNParams {
             (0.1_f64.ln(), 1.0_f64.ln()),   // 12: noisy_sigma_init (log scale)
             (128.0, 512.0),                 // 13: dueling_hidden_dim (linear, step=128)
             (3.0, 5.0),                     // 14: n_steps (raised min: n=3 is Rainbow standard)
-            (11.0, 51.0),                   // 15: num_atoms (11=RTX3050, 51=H100 — GPU profile caps this)
+            (11.0, 101.0),                  // 15: num_atoms (11=RTX3050, 51=H100 default, 101=max — C51 resolution)
 
             // Weight decay (1D)
             (1e-4_f64.ln(), 1e-2_f64.ln()), // 16: weight_decay (C2 FIX: 10x stronger — prevents 14x val/train overfitting)