diff --git a/backend/blueprints/profile/__init__.py b/backend/blueprints/profile/__init__.py
index fd01f4b..47717ee 100644
--- a/backend/blueprints/profile/__init__.py
+++ b/backend/blueprints/profile/__init__.py
@@ -137,3 +137,51 @@ def get_profile():
     except Exception as e:
         return jsonify({"error": f"Failed to fetch profile. Error: {str(e)}"}), 500
 
+
+@profile.route('/update-profile-picture', methods=['PATCH'])
+@auth_required()
+def update_profile_picture():
+    """
+    Allow the logged-in user to change their profile picture.
+    """
+    user:User = g.current_user
+
+    # Check if a file is attached
+    if 'profile_picture' not in request.files:
+        return jsonify({"error": "No file uploaded"}), 400
+
+    file = request.files['profile_picture']
+
+    # Validate file type
+    if file.filename == '':
+        return jsonify({"error": "No selected file"}), 400
+    if not allowed_file(file.filename):
+        return jsonify({"error": "Invalid file type"}), 400
+
+    # Secure the filename and save the new file
+    filename = secure_filename(f"user_{user.id}_{file.filename}")
+    new_filepath = os.path.join(USER_UPLOADS_DIR, filename)
+    file.save(new_filepath)
+
+    # Delete the old profile picture (if it's not the default)
+    if user.pfpFilename != DEFAULT_PROFILE_FILE:
+        old_filepath = os.path.join(USER_UPLOADS_DIR, user.pfpFilename)
+        if os.path.exists(old_filepath):
+            os.remove(old_filepath)
+
+    # Update the user's profile picture
+    user.pfpFilename = filename
+    db.session.commit()
+
+    # Generate the new profile URL
+    profile_url = url_for('send_file',filename=user.pfpFilename,_external=True)
+
+    return jsonify({"message": "Profile picture updated successfully", "profile_url": profile_url}), 200
+
+
+def allowed_file(filename):
+    """
+    Validate file extensions.
+    """
+    allowed_extensions = {'png', 'jpg', 'jpeg', 'gif'}
+    return '.' in filename and filename.rsplit('.', 1)[1].lower() in allowed_extensions
\ No newline at end of file
diff --git a/backend/uploads/1.jpg b/backend/uploads/1.jpg
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diff --git a/backend/uploads/user_f7ab56f1-d692-409e-98ab-2a563f37e389_1638856701024.jpg b/backend/uploads/user_f7ab56f1-d692-409e-98ab-2a563f37e389_1638856701024.jpg
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