diff --git a/gallery/__init__.py b/gallery/__init__.py
index a862223..17174dd 100644
--- a/gallery/__init__.py
+++ b/gallery/__init__.py
@@ -58,12 +58,9 @@ def create_app(test_config=None):
         app.config.from_mapping(test_config)
 
     # Load JS assets
-    js_pre = Bundle('js/pre/*.js', output='gen/pre_packed.js')
-    js_post = Bundle('js/post/*.js', output='gen/post_packed.js')
-    styles = Bundle('sass/*.sass', filters='libsass', output='gen/styles.css')
-    assets.register('js_pre', js_pre)
-    assets.register('js_post', js_post)
-    assets.register('styles', styles)
+    assets.register('js_pre', Bundle('js/pre/*.js', output='gen/pre_packed.js'))
+    assets.register('js_post', Bundle('js/post/*.js', output='gen/post_packed.js'))
+    assets.register('styles', Bundle('sass/*.sass', filters='libsass', output='gen/styles.css'))
 
     # Error handlers, if the error is not a HTTP error, return 500
     @app.errorhandler(Exception)
diff --git a/gallery/static/js/post/popup.js b/gallery/static/js/pre/popup.js
similarity index 100%
rename from gallery/static/js/post/popup.js
rename to gallery/static/js/pre/popup.js
diff --git a/gallery/templates/image.html b/gallery/templates/image.html
index a088615..e07320f 100644
--- a/gallery/templates/image.html
+++ b/gallery/templates/image.html
@@ -33,7 +33,7 @@
             }
         }
 
-        {% if g.user['id'] == image['author_id'] %}
+        {% if g.user.id == image.author_id %}
             cancelBtn = document.createElement('button');
             cancelBtn.classList.add('btn-block');
             cancelBtn.innerHTML = 'nuuuuuuuu';
@@ -46,26 +46,27 @@
             deleteBtn.onclick = deleteConfirm;
 
             function imageDelete() {
-                popUpShow(
-                    'DESTRUCTION!!!!!!',
-                    'Do you want to delete this image along with all of its data??? This action is irreversible!',
-                    null,
-                    [cancelBtn, deleteBtn]
-                    );
+                popUpShow('DESTRUCTION!!!!!!',
+                          'Do you want to delete this image along with all of its data??? ' +
+                          'This action is irreversible!',
+                          null,
+                          [cancelBtn, deleteBtn]);
             }
             function deleteConfirm() {
                 popupDissmiss();
 
-                $.ajax({
-                    url: '{{ url_for('api.delete_image', image_id=image['id']) }}',
-                    type: 'post',
-                    data: {
+                fetch('{{ url_for('api.delete_image', image_id=image['id']) }}', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json'
+                    },
+                    body: JSON.stringify({
                         action: 'delete'
-                    },
-                    success: function (response) {
+                    })
+                }).then(function(response) {
+                    if (response.ok) {
                         window.location.href = '/';
-                    },
-                    error: function (response) {
+                    } else {
                         addNotification(`Image *clings*: ${response}`, 2);
                     }
                 });
@@ -148,7 +149,7 @@
                     </span>
                 </a>
             </div>
-            {% if image.author_id == g.user.id %}
+            {% if g.user.id == image.author_id %}
                 <div>
                     <button class="pill-item pill__critical" onclick="imageDelete()">
                         <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="currentColor" viewBox="0 0 256 256"><path d="M216,48H176V40a24,24,0,0,0-24-24H104A24,24,0,0,0,80,40v8H40a8,8,0,0,0,0,16h8V208a16,16,0,0,0,16,16H192a16,16,0,0,0,16-16V64h8a8,8,0,0,0,0-16ZM112,168a8,8,0,0,1-16,0V104a8,8,0,0,1,16,0Zm48,0a8,8,0,0,1-16,0V104a8,8,0,0,1,16,0Zm0-120H96V40a8,8,0,0,1,8-8h48a8,8,0,0,1,8,8Z"></path></svg>
diff --git a/poetry.lock b/poetry.lock
index 8fc8537..26dbdbd 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.4.0 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.4.1 and should not be changed by hand.
 
 [[package]]
 name = "astroid"
@@ -253,21 +253,20 @@ brotli = "*"
 flask = "*"
 
 [[package]]
-name = "flask-session2"
-version = "1.3.1"
-description = "Adds server-side session support to your Flask application"
+name = "flask-login"
+version = "0.6.2"
+description = "User authentication and session management for Flask."
 category = "main"
 optional = false
-python-versions = ">=3.7.2,<4.0.0"
+python-versions = ">=3.7"
 files = [
-    {file = "Flask-Session2-1.3.1.tar.gz", hash = "sha256:171e986d4e314795f448a527095e42df6abfba76c3e4ce5c8e4c61c857c59cb2"},
-    {file = "Flask_Session2-1.3.1-py3-none-any.whl", hash = "sha256:6d1615dfc4b247759f31f89bf16aba96fa1294077e700771875abe952f291959"},
+    {file = "Flask-Login-0.6.2.tar.gz", hash = "sha256:c0a7baa9fdc448cdd3dd6f0939df72eec5177b2f7abe6cb82fc934d29caac9c3"},
+    {file = "Flask_Login-0.6.2-py3-none-any.whl", hash = "sha256:1ef79843f5eddd0f143c2cd994c1b05ac83c0401dc6234c143495af9a939613f"},
 ]
 
 [package.dependencies]
-cachelib = ">=0.9.0,<0.10.0"
-Flask = ">=2.2.2,<3.0.0"
-pytz = ">=2022.2.1,<2023.0.0"
+Flask = ">=1.0.4"
+Werkzeug = ">=1.0.1"
 
 [[package]]
 name = "greenlet"
@@ -706,18 +705,6 @@ files = [
 [package.extras]
 cli = ["click (>=5.0)"]
 
-[[package]]
-name = "pytz"
-version = "2022.7.1"
-description = "World timezone definitions, modern and historical"
-category = "main"
-optional = false
-python-versions = "*"
-files = [
-    {file = "pytz-2022.7.1-py2.py3-none-any.whl", hash = "sha256:78f4f37d8198e0627c5f1143240bb0206b8691d8d7ac6d78fee88b78733f8c4a"},
-    {file = "pytz-2022.7.1.tar.gz", hash = "sha256:01a0681c4b9684a28304615eba55d1ab31ae00bf68ec157ec3708a8182dbbcd0"},
-]
-
 [[package]]
 name = "pyyaml"
 version = "6.0"
@@ -1033,4 +1020,4 @@ testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "fdc83d433d98ba079b4614e37da26b9c81f07e0a646606c17de5c0fb07ae483e"
+content-hash = "431b58579dc3ebde52c8f3905c851556a465d5a82796a8a26718d69cb4915959"
diff --git a/pyproject.toml b/pyproject.toml
index f7ec803..3b4bd29 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ Flask = "^2.2.2"
 Flask-Compress = "^1.13"
 Flask-Caching = "^2.0.2" 
 Flask-Assets = "^2.0"
-Flask-Session2 = "^1.3.1"
+Flask-Login = "^0.6.2"
 SQLAlchemy = "^2.0.3"
 python-dotenv = "^0.21.0"
 gunicorn = "^20.1.0"