diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 579d9d19..bf7e23c8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -66,6 +66,13 @@ jobs:
             gradle: '8.14.2'
             toolchainJavaVersion: 21
 
+          - java: 17
+            gradle: '9.0.0-rc-1'
+
+          - java: 17
+            gradle: '9.0.0-rc-1'
+            toolchainJavaVersion: 21
+
     env:
       TEST_ALL_CONTAINERS: ${{ matrix.container }}
       GRADLE_VERSION: ${{ matrix.gradle }}
@@ -97,7 +104,7 @@ jobs:
             --warning-mode all \
             -PprivateRepoDir=$PRIVATE_REPO \
             publishToPrivateRepo
-        if: "startsWith(env.GRADLE_VERSION, '8.')"
+        if: ${{ ! startsWith(env.GRADLE_VERSION, '7.') }}
         working-directory: integrationTests/buildSrc
       # end workaround
 
diff --git a/libs/gretty/src/main/groovy/org/akhikhl/gretty/ServletContainerConfig.groovy b/libs/gretty/src/main/groovy/org/akhikhl/gretty/ServletContainerConfig.groovy
index 2dce5fc1..811722bc 100644
--- a/libs/gretty/src/main/groovy/org/akhikhl/gretty/ServletContainerConfig.groovy
+++ b/libs/gretty/src/main/groovy/org/akhikhl/gretty/ServletContainerConfig.groovy
@@ -32,7 +32,7 @@ class ServletContainerConfig {
       boolean alteredDependencies = false
       File webXmlFile = new File(ProjectUtils.getWebAppDir(proj), 'WEB-INF/web.xml')
       if(webXmlFile.exists()) {
-        def webXml = new XmlSlurper().parse(webXmlFile)
+        def webXml = new groovy.xml.XmlSlurper().parse(webXmlFile)
         if(webXml.filter.find { it.'filter-class'.text() == 'org.akhikhl.gretty.RedirectFilter' }) {
           project.dependencies.add 'runtimeOnly', "org.gretty:gretty-filter:${project.ext.grettyVersion}", {
             exclude group: 'javax.servlet', module: 'servlet-api'