diff --git a/scripts/optimize-conversion-engine.py b/scripts/optimize-conversion-engine.py
index 7086ca06..3a6e8146 100644
--- a/scripts/optimize-conversion-engine.py
+++ b/scripts/optimize-conversion-engine.py
@@ -26,7 +26,6 @@
 import hashlib
 from dataclasses import dataclass
 from functools import lru_cache, wraps
-import pickle
 import gzip
 
 # Add paths for imports
@@ -58,7 +57,7 @@ def cache_file_result(self, cache_key: str, result: Any, ttl_seconds: int = 3600
         }
         
         with gzip.open(cache_file, 'wb') as f:
-            pickle.dump(cache_data, f)
+            f.write(json.dumps(cache_data).encode('utf-8'))
     
     def get_cached_file_result(self, cache_key: str) -> Optional[Any]:
         """Retrieve cached file result if valid"""
@@ -69,7 +68,7 @@ def get_cached_file_result(self, cache_key: str) -> Optional[Any]:
         
         try:
             with gzip.open(cache_file, 'rb') as f:
-                cache_data = pickle.load(f)
+                cache_data = json.loads(f.read().decode('utf-8'))
                 
             # Check if cache is still valid
             if time.time() - cache_data["timestamp"] > cache_data["ttl"]: