diff --git a/viewers/webcomponents/htmx/pom.xml b/viewers/webcomponents/htmx/pom.xml
index 1d8f07f2cca..c4195c7747f 100644
--- a/viewers/webcomponents/htmx/pom.xml
+++ b/viewers/webcomponents/htmx/pom.xml
@@ -36,7 +36,7 @@
     <properties>
         <jar-plugin.automaticModuleName>org.apache.causeway.viewer.webcomponents.htmx</jar-plugin.automaticModuleName>
         <git-plugin.propertiesDir>org/apache/causeway/viewer/webcomponents/htmx</git-plugin.propertiesDir>
-        <htmx.version>2.0.6</htmx.version>
+        <htmx.version>4.0.0</htmx.version>
     </properties>
 
     <dependencies>