diff --git a/add_app.py b/add_app.py
index 677a60e..3055217 100644
--- a/add_app.py
+++ b/add_app.py
@@ -1,3 +1,4 @@
+import ast
 import os
 import sys
 
@@ -9,14 +10,41 @@ def add_app_to_installed_apps(app_name, project_path):
         with open(settings_file_path, 'r') as settings_file:
             settings_content = settings_file.read()
 
+        # Parse the AST of the settings file
+        tree = ast.parse(settings_content)
+
         # Check if the app is already in INSTALLED_APPS
-        if f"'{app_name}'," in settings_content:
+        app_already_added = any(
+            isinstance(node, ast.Str) and node.s == app_name
+            for node in ast.walk(tree)
+            if isinstance(node, ast.List) and node.elts
+        )
+
+        if app_already_added:
+            return
+
+        # Find the INSTALLED_APPS assignment node
+        installed_apps_node = None
+        for node in ast.walk(tree):
+            if (
+                isinstance(node, ast.Assign)
+                and len(node.targets) == 1
+                and isinstance(node.targets[0], ast.Name)
+                and node.targets[0].id == 'INSTALLED_APPS'
+            ):
+                installed_apps_node = node
+                break
+
+        if installed_apps_node is None:
             return
 
         # Add the app to INSTALLED_APPS
-        with open(settings_file_path, 'a') as settings_file:
-            settings_file.write(f"\n    '{app_name}',  # Added by GitHub Actions\n")
-    except Exception:
+        installed_apps_node.value.elts.append(ast.Str(s=app_name))
+
+        # Write the modified AST back to the settings file
+        with open(settings_file_path, 'w') as settings_file:
+            settings_file.write(ast.unparse(tree))
+    except Exception as e:
         pass