diff --git a/src/tracegrad/synthesize.py b/src/tracegrad/synthesize.py
index 7f812fb..022d43f 100644
--- a/src/tracegrad/synthesize.py
+++ b/src/tracegrad/synthesize.py
@@ -29,7 +29,6 @@
 from .schema import AttributionResult, Edit
 from .state import atomic_write_json, initialize
 
-SYNTHESIS_PROMPT_VERSION = 1
 MAX_REPROMPTS = 2
 DEFAULT_EVIDENCE_QUOTES = 3