diff --git a/klanglicht-module-base/src/main/kotlin/de/visualdigits/kotlin/klanglicht/hardware/lightmanager/model/lm/LMScene.kt b/klanglicht-module-base/src/main/kotlin/de/visualdigits/kotlin/klanglicht/hardware/lightmanager/model/lm/LMScene.kt
index 6c94554..c92700e 100644
--- a/klanglicht-module-base/src/main/kotlin/de/visualdigits/kotlin/klanglicht/hardware/lightmanager/model/lm/LMScene.kt
+++ b/klanglicht-module-base/src/main/kotlin/de/visualdigits/kotlin/klanglicht/hardware/lightmanager/model/lm/LMScene.kt
@@ -8,6 +8,6 @@ class LMScene(
 ) {
 
     override fun toString(): String {
-        return "$name: $color${if (actions.isNotEmpty()) "\n    - ${actions.joinToString("\n    - ")}" else ""}"
+        return "$name: ${color.joinToString(",")}${if (actions.isNotEmpty()) "\n    - ${actions.joinToString("\n    - ")}" else ""}"
     }
 }
diff --git a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMHtmlScene.kt b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMHtmlScene.kt
index a2f40d7..9691683 100644
--- a/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMHtmlScene.kt
+++ b/klanglicht-rest/src/main/kotlin/de/visualdigits/kotlin/klanglicht/rest/lightmanager/model/html/LMHtmlScene.kt
@@ -17,19 +17,20 @@ class LMHtmlScene(
         val url = configHolder.preferences?.ownUrl
         val sb = StringBuilder()
         sb.append("      <div class=\"button\"")
-        if (scene.color?.isNotEmpty() == true) {
-            if (scene.color?.contains(",") == true) {
+        if (scene.color.isNotEmpty()) {
+            val sceneColor = scene.color.joinToString(",")
+            if (scene.color.size > 1) {
                 sb.append(" style=\"background: -moz-linear-gradient(left, ")
-                    .append(scene.color)
+                    .append(sceneColor)
                     .append("); background: -webkit-linear-gradient(left, ")
-                    .append(scene.color)
+                    .append(sceneColor)
                     .append("); background: linear-gradient(to right, ")
-                    .append(scene.color)
+                    .append(sceneColor)
                     .append(");\"")
             }
             else {
                 sb.append(" style=\"background-color: ")
-                    .append(scene.color)
+                    .append(sceneColor)
                     .append(";\"")
             }
         }
diff --git a/pom.xml b/pom.xml
index a604917..9b294e9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -27,12 +27,12 @@
 
     <kotlin.code.style>official</kotlin.code.style>
 
-    <version.jackson>2.15.2</version.jackson>
-    <version.kotlin.maven>1.9.20</version.kotlin.maven>
+    <version.jackson>2.16.2</version.jackson>
+    <version.kotlin.maven>1.9.23</version.kotlin.maven>
     <version.kotlin.language>1.9</version.kotlin.language>
     <version.log4j>1.2.17</version.log4j>
     <version.slf4j>2.0.5</version.slf4j>
-    <version.junit.jupiter>5.10.0</version.junit.jupiter>
+    <version.junit.jupiter>5.10.2</version.junit.jupiter>
     <version.acme4j-client>2.16</version.acme4j-client>
   </properties>
 
@@ -88,14 +88,14 @@
     <dependency>
       <groupId>org.jetbrains.kotlinx</groupId>
       <artifactId>kotlinx-coroutines-core</artifactId>
-      <version>1.7.2</version>
+      <version>1.7.3</version>
     </dependency>
 
     <!-- testing -->
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>
-      <version>5.10.0</version>
+      <version>${version.junit.jupiter}</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
@@ -128,7 +128,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>
-        <version>3.2.1</version> <!-- do not update to 3.3.0 due to a bug regarding multi module builds -->
+        <version>3.3.0</version> <!-- do not update to 3.3.0 due to a bug regarding multi module builds -->
         <executions>
           <execution>
             <id>attach-sources</id>
@@ -191,13 +191,13 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
-        <version>3.1.2</version>
+        <version>3.2.5</version>
       </plugin>
 
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-failsafe-plugin</artifactId>
-        <version>3.1.2</version>
+        <version>3.2.5</version>
       </plugin>
     </plugins>
   </build>