diff --git a/bom/compile/pom.xml b/bom/compile/pom.xml
index 7af442013..b39b59625 100644
--- a/bom/compile/pom.xml
+++ b/bom/compile/pom.xml
@@ -17,7 +17,7 @@
   <description>The dependencies that are used to compile the core bundles</description>
 
   <properties>
-    <californium.version>4.0.0-M2</californium.version>
+    <californium.version>4.0.0-M6</californium.version>
     <jetty.version>9.4.58.v20250814</jetty.version>
     <pax.web.version>8.0.35</pax.web.version>
     <swagger.version>2.2.43</swagger.version>
diff --git a/bom/runtime/pom.xml b/bom/runtime/pom.xml
index 061f4b416..eb8d07396 100644
--- a/bom/runtime/pom.xml
+++ b/bom/runtime/pom.xml
@@ -16,7 +16,7 @@
   <name>openHAB Core :: BOM :: Runtime</name>
 
   <properties>
-    <californium.version>4.0.0-M2</californium.version>
+    <californium.version>4.0.0-M6</californium.version>
     <!-- cxf can be updated independently of karaf, only used in karaf tests -->
     <cxf.version>3.6.10</cxf.version>
     <jackson.annotations.version>2.21</jackson.annotations.version>
diff --git a/features/karaf/openhab-tp/src/main/feature/feature.xml b/features/karaf/openhab-tp/src/main/feature/feature.xml
index dd810a231..02b9c5609 100644
--- a/features/karaf/openhab-tp/src/main/feature/feature.xml
+++ b/features/karaf/openhab-tp/src/main/feature/feature.xml
@@ -42,11 +42,11 @@
 	</feature>
 
 	<feature name="openhab.tp-coap" description="Californium CoAP library" version="${project.version}">
-		<capability>openhab.tp;feature=coap;version=4.0.0-M2</capability>
-		<bundle>mvn:org.eclipse.californium/californium-osgi/4.0.0-M2</bundle>
-		<bundle>mvn:org.eclipse.californium/californium-core/4.0.0-M2</bundle>
-		<bundle>mvn:org.eclipse.californium/element-connector/4.0.0-M2</bundle>
-		<bundle>mvn:org.eclipse.californium/scandium/4.0.0-M2</bundle>
+		<capability>openhab.tp;feature=coap;version=4.0.0-M6</capability>
+		<bundle>mvn:org.eclipse.californium/californium-osgi/4.0.0-M6</bundle>
+		<bundle>mvn:org.eclipse.californium/californium-core/4.0.0-M6</bundle>
+		<bundle>mvn:org.eclipse.californium/element-connector/4.0.0-M6</bundle>
+		<bundle>mvn:org.eclipse.californium/scandium/4.0.0-M6</bundle>
 		<bundle dependency="true">mvn:org.slf4j/jul-to-slf4j/2.0.17</bundle>
 		<bundle dependency="true">mvn:org.bouncycastle/bcprov-jdk18on/1.84</bundle>
 	</feature>