diff --git a/.eslintrc.js b/.eslintrc.js
index 6f55cdb57b4cb601f0b12175aa8bc22d80e96575..143db2401a0f5b17cabd500a8874b22f086d7260 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -10,6 +10,7 @@ module.exports = {
         "$": "readonly",
         "$$": "readonly",
         "django": "readonly",
-        "FullCalendar": "readonly"
+        "FullCalendar": "readonly",
+        "Datepicker": "readonly"
     }
 };
diff --git a/castellum/settings/default.py b/castellum/settings/default.py
index 5dc90deaebc183321d7035b8f0e885a6fa0c6caa..9948c97f939763e4b28ec76e593092e5dadc9ba8 100644
--- a/castellum/settings/default.py
+++ b/castellum/settings/default.py
@@ -182,10 +182,10 @@ NPM_FILE_PATTERNS = {
         'dist/css/bootstrap.min.css',
         'dist/js/bootstrap.min.js'
     ],
-    'bootstrap-datepicker': [
-        'dist/css/bootstrap-datepicker3.min.css',
-        'dist/js/bootstrap-datepicker.min.js',
-        'dist/locales/bootstrap-datepicker.de.min.js',
+    'vanillajs-datepicker': [
+        'dist/css/datepicker.min.css',
+        'dist/js/datepicker.min.js',
+        'dist/js/locales/de.js',
     ],
     'jdenticon': ['dist/jdenticon.min.js'],
     'jquery': ['dist/jquery.min.js'],
diff --git a/castellum/static/js/utils.js b/castellum/static/js/utils.js
index 919b20d44a459aa235e5546d8e3a96bba4a90b26..f6f504f8e57c9c4255c2e83858a45b7aab505a6c 100644
--- a/castellum/static/js/utils.js
+++ b/castellum/static/js/utils.js
@@ -45,12 +45,12 @@
 
     document.querySelectorAll('[type="date"]').forEach(function(e) {
         if (e.type !== 'date') {
-            $(e).datepicker({
+            new Datepicker(e, {
                 format: 'yyyy-mm-dd',
                 language: document.documentElement.lang,
                 autoclose: true,
                 calendarWeeks: true,
-                daysOfWeekHighlighted: '0,6',
+                daysOfWeekHighlighted: [0, 6],
                 todayHighlight: true,
             });
         }
diff --git a/castellum/templates/base.html b/castellum/templates/base.html
index 3c6be178a70e76ceedf3fa32952fc0ec154e65bc..d2a5ae4b6d00d654850983f1616d91a95307de2f 100644
--- a/castellum/templates/base.html
+++ b/castellum/templates/base.html
@@ -12,7 +12,7 @@
 
     <link rel="shortcut icon" type="image/x-icon" href="{% static 'images/favicon.ico' %}" />
     <link rel="stylesheet" type="text/css" href="{% static 'bootstrap/dist/css/bootstrap.min.css' %}" />
-    <link rel="stylesheet" type="text/css" href="{% static 'bootstrap-datepicker/dist/css/bootstrap-datepicker3.min.css' %}" />
+    <link rel="stylesheet" type="text/css" href="{% static 'vanillajs-datepicker/dist/css/datepicker.min.css' %}" />
     <link rel="stylesheet" type="text/css" href="{% static '@fortawesome/fontawesome-free/css/all.min.css' %}" />
     <link rel="stylesheet" type="text/css" href="{% static 'style.css' %}" />
     {% block extra_styles %}{% endblock %}
@@ -127,8 +127,8 @@
     <script src="{% static 'jdenticon/dist/jdenticon.min.js' %}"></script>
     <script src="{% static 'popper.js/dist/umd/popper.min.js' %}"></script>
     <script src="{% static 'bootstrap/dist/js/bootstrap.min.js' %}"></script>
-    <script src="{% static 'bootstrap-datepicker/dist/js/bootstrap-datepicker.min.js' %}"></script>
-    <script src="{% static 'bootstrap-datepicker/dist/locales/bootstrap-datepicker.de.min.js' %}"></script>
+    <script src="{% static 'vanillajs-datepicker/dist/js/datepicker.min.js' %}"></script>
+    <script src="{% static 'vanillajs-datepicker/dist/js/locales/de.js' %}"></script>
     <script src="{% static 'js/utils.js' %}"></script>
     <script src="{% static 'js/unsaved-changes.js' %}"></script>
 
diff --git a/package.json b/package.json
index dfdc66964f4c5b72814f449025e2444c0b82bc69..9e17c0de6533fbb82735748ab6b9cbed162e15b6 100644
--- a/package.json
+++ b/package.json
@@ -4,11 +4,11 @@
   "dependencies": {
     "@fortawesome/fontawesome-free": "^5.15.2",
     "bootstrap": "^4.6.0",
-    "bootstrap-datepicker": "^1.9.0",
     "fullcalendar-scheduler": "^5.5.1",
     "jdenticon": "^3.1.0",
     "jquery": "^3.5.1",
-    "popper.js": "^1.16.0"
+    "popper.js": "^1.16.0",
+    "vanillajs-datepicker": "^1.1.2"
   },
   "devDependencies": {
     "eslint": "^7.18.0"