diff --git a/src/agents/momus.ts b/src/agents/momus.ts
index d6891d75c..76eb592e5 100644
--- a/src/agents/momus.ts
+++ b/src/agents/momus.ts
@@ -199,9 +199,9 @@ If REJECT:
 `;
 
 /**
- * GPT-5.4 Optimized Momus System Prompt
+ * GPT-5.5 Optimized Momus System Prompt
  *
- * Tuned for GPT-5.4 system prompt design principles:
+ * Tuned for GPT-5.5 system prompt design principles:
  * - XML-tagged instruction blocks for clear structure
  * - Prose-first output, explicit opener blacklist
  * - Blocker-finder philosophy preserved