diff --git a/scripts/update_changelog.py b/scripts/update_changelog.py
index 6c43d28..dfec2ad 100644
--- a/scripts/update_changelog.py
+++ b/scripts/update_changelog.py
@@ -3,7 +3,14 @@ import re
 from datetime import datetime
 
 def get_version():
-    with open('../platformio.ini', 'r') as f:
+    # Get the script's directory
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    # Get the project root directory (one level up)
+    project_dir = os.path.dirname(script_dir)
+    
+    platformio_path = os.path.join(project_dir, 'platformio.ini')
+    
+    with open(platformio_path, 'r') as f:
         content = f.read()
         version_match = re.search(r'version\s*=\s*"([^"]+)"', content)
         return version_match.group(1) if version_match else None
@@ -12,6 +19,11 @@ def update_changelog():
     version = get_version()
     today = datetime.now().strftime('%Y-%m-%d')
     
+    # Get absolute paths
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    project_dir = os.path.dirname(script_dir)
+    changelog_path = os.path.join(project_dir, 'CHANGELOG.md')
+    
     changelog_template = f"""## [{version}] - {today}
 ### Added
 - 
@@ -23,14 +35,21 @@ def update_changelog():
 -
 """
     
-    with open('../CHANGELOG.md', 'r') as f:
-        content = f.read()
-    
-    # Insert new version template after the header
-    updated_content = content.replace("# Changelog\n", f"# Changelog\n\n{changelog_template}")
-    
-    with open('../CHANGELOG.md', 'w') as f:
-        f.write(updated_content)
+    if not os.path.exists(changelog_path):
+        # Create new changelog if it doesn't exist
+        with open(changelog_path, 'w') as f:
+            f.write(f"# Changelog\n\n{changelog_template}")
+    else:
+        # Update existing changelog
+        with open(changelog_path, 'r') as f:
+            content = f.read()
+        
+        if f"[{version}]" not in content:
+            # Only add new version if it doesn't exist
+            updated_content = content.replace("# Changelog\n", f"# Changelog\n\n{changelog_template}")
+            
+            with open(changelog_path, 'w') as f:
+                f.write(updated_content)
 
 if __name__ == "__main__":
     update_changelog()
\ No newline at end of file