diff --git a/pom.xml b/pom.xml
index cdcd1bd..ec34bd5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -100,7 +100,7 @@
     <dependency>
       <groupId>org.webjars</groupId>
       <artifactId>bootstrap</artifactId>
-      <version>5.0.0</version>
+      <version>5.1.1</version>
     </dependency>
     <dependency>
       <groupId>org.webjars.npm</groupId>
diff --git a/src/main/resources/META-INF/resources/error.html b/src/main/resources/META-INF/resources/error.html
index c64651a..e4b0d74 100644
--- a/src/main/resources/META-INF/resources/error.html
+++ b/src/main/resources/META-INF/resources/error.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="UTF-8"/>
   <meta name="viewport" content="width=device-width, initial-scale=1">
-  <link rel="stylesheet" href="/webjars/bootstrap/5.0.0/css/bootstrap.min.css">
+  <link rel="stylesheet" href="/webjars/bootstrap/5.1.1/css/bootstrap.min.css">
   <link rel="stylesheet" href="/webjars/bootstrap-icons/1.5.0/font/bootstrap-icons.css">
   <title>Bürokalender</title>
 </head>
diff --git a/src/main/resources/META-INF/resources/login.html b/src/main/resources/META-INF/resources/login.html
index 6d08fe7..b39b51a 100644
--- a/src/main/resources/META-INF/resources/login.html
+++ b/src/main/resources/META-INF/resources/login.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="UTF-8"/>
   <meta name="viewport" content="width=device-width, initial-scale=1">
-  <link rel="stylesheet" href="/webjars/bootstrap/5.0.0/css/bootstrap.min.css">
+  <link rel="stylesheet" href="/webjars/bootstrap/5.1.1/css/bootstrap.min.css">
   <link rel="stylesheet" href="/webjars/bootstrap-icons/1.5.0/font/bootstrap-icons.css">
   <title>Bürokalender</title>
 </head>
@@ -28,6 +28,6 @@
     </div>
   </div>
 </div>
-<script src="/webjars/bootstrap/5.0.0/js/bootstrap.min.js"></script>
+<script src="/webjars/bootstrap/5.1.1/js/bootstrap.min.js"></script>
 </body>
 </html>
\ No newline at end of file
diff --git a/src/main/resources/templates/base.html b/src/main/resources/templates/base.html
index f6e5136..c191b64 100644
--- a/src/main/resources/templates/base.html
+++ b/src/main/resources/templates/base.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="UTF-8"/>
   <meta name="viewport" content="width=device-width, initial-scale=1">
-  <link rel="stylesheet" href="/webjars/bootstrap/5.0.0/css/bootstrap.min.css">
+  <link rel="stylesheet" href="/webjars/bootstrap/5.1.1/css/bootstrap.min.css">
   <link rel="stylesheet" href="/webjars/bootstrap-icons/1.5.0/font/bootstrap-icons.css">
 
   <title>Bürokalender</title>
@@ -30,6 +30,6 @@
   {#insert contents}No contents!{/}
 </div>
 <script src="/webjars/popper.js/2.9.2/umd/popper.min.js"></script>
-<script src="/webjars/bootstrap/5.0.0/js/bootstrap.min.js"></script>
+<script src="/webjars/bootstrap/5.1.1/js/bootstrap.min.js"></script>
 </body>
 </html>
\ No newline at end of file
