diff --git a/README.md b/README.md
index d023884..cabed25 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,22 @@ To sync repositories and generate a report once:
 python aocsync.py --once
 ```
 
+### Force Rerun All Days
+
+To force rerun all days even if repositories haven't changed:
+
+```bash
+python aocsync.py --once --force
+```
+
+or
+
+```bash
+python aocsync.py --once --rerun-all
+```
+
+This is useful for refreshing all data or testing changes to the script.
+
 ### Continuous Polling
 
 To continuously poll repositories (default):
diff --git a/aocsync.py b/aocsync.py
index 0ca0b7f..944f96a 100755
--- a/aocsync.py
+++ b/aocsync.py
@@ -907,11 +907,12 @@ class HTMLGenerator:
 class AOCSync:
     """Main synchronization orchestrator"""
     
-    def __init__(self, config_path: str = "config.yaml"):
+    def __init__(self, config_path: str = "config.yaml", force_rerun: bool = False):
         self.config = Config(config_path)
         self.db = Database(os.path.join(self.config.data_dir, 'results.db'))
         self.html_gen = HTMLGenerator(self.config.output_dir)
         self.git_manager = GitManager()
+        self.force_rerun = force_rerun
     
     def process_repository(self, repo_config: dict, user_name: str):
         """Process a single repository configuration"""
@@ -922,8 +923,11 @@ class AOCSync:
             url = repo_config['url']
             local_path = repo_config['local_path']
             
-            if self.git_manager.has_changes(url, local_path):
-                logger.info(f"Repository {user_name} has changes, updating...")
+            if self.force_rerun or self.git_manager.has_changes(url, local_path):
+                if self.force_rerun:
+                    logger.info(f"Force rerun enabled, processing repository {user_name}...")
+                else:
+                    logger.info(f"Repository {user_name} has changes, updating...")
                 if self.git_manager.clone_or_update_repo(url, local_path):
                     repo_path = Path(local_path)
                     
@@ -963,8 +967,11 @@ class AOCSync:
                 url = year_config['url']
                 local_path = year_config['local_path']
                 
-                if self.git_manager.has_changes(url, local_path):
-                    logger.info(f"Repository {user_name} year {year} has changes, updating...")
+                if self.force_rerun or self.git_manager.has_changes(url, local_path):
+                    if self.force_rerun:
+                        logger.info(f"Force rerun enabled, processing repository {user_name} year {year}...")
+                    else:
+                        logger.info(f"Repository {user_name} year {year} has changes, updating...")
                     if self.git_manager.clone_or_update_repo(url, local_path):
                         repo_path = Path(local_path)
                         self._run_and_store_benchmarks(repo_path, year, user_name, 
@@ -1034,10 +1041,12 @@ def main():
     parser = argparse.ArgumentParser(description='AOC Sync - Poll and compare AOC implementations')
     parser.add_argument('--config', default='config.yaml', help='Path to config file')
     parser.add_argument('--once', action='store_true', help='Run once instead of continuously')
+    parser.add_argument('--force', '--rerun-all', action='store_true', dest='force_rerun',
+                       help='Force rerun all days even if repository has not changed')
     
     args = parser.parse_args()
     
-    sync = AOCSync(args.config)
+    sync = AOCSync(args.config, force_rerun=args.force_rerun)
     
     if args.once:
         sync.sync_all()