diff --git a/Dockerfile b/Dockerfile
index 29eef11..fd8b349 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,8 @@
-ARG MAVEN_BUILDER=3-openjdk-17-slim
+#ARG MAVEN_BUILDER=3-openjdk-17-slim
+#ARG SONARQUBE_VERSION=25.3.0.104237-community
 
-#ARG SONARQUBE_VERSION=24.12.0.100206-community
-ARG SONARQUBE_VERSION=25.3.0.104237-community
+ARG MAVEN_BUILDER=3-openjdk-11-slim
+ARG SONARQUBE_VERSION=9.9.8-community
 
 FROM maven:${MAVEN_BUILDER} AS builder
 
diff --git a/pom.xml b/pom.xml
index 69b9d72..a21bc84 100644
--- a/pom.xml
+++ b/pom.xml
@@ -36,7 +36,7 @@
 
     <properties>
 
-        <java.version>17</java.version>
+        <java.version>11</java.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
         <!-- to prevent message: system modules path not set in conjunction with -source 11 -->
@@ -82,7 +82,8 @@
         <test-it.sonarqube.keepRunning>false</test-it.sonarqube.keepRunning>
 
         <!-- Version of `sonarqube` used by integration tests (you can override this value to perform matrix compatibility tests) -->
-        <test-it.sonarqube.version>25.5.0.107428</test-it.sonarqube.version>
+<!--        <test-it.sonarqube.version>25.5.0.107428</test-it.sonarqube.version>-->
+        <test-it.sonarqube.version>9.9.8.100196</test-it.sonarqube.version>
 
         <!-- Version of `sonar-python-plugin` used by integration tests (you can override this value to perform matrix compatibility tests) -->
         <test-it.sonarpython.version>${sonarpython.version}</test-it.sonarpython.version>
@@ -329,7 +330,7 @@
             <plugin>
                 <groupId>com.mycila</groupId>
                 <artifactId>license-maven-plugin</artifactId>
-                <!-- max version without pb for JDK 17 / recent versions have a NPE when deploying in docker -->
+                <!-- max version without pb for JDK 11 and 17 / recent versions have a NPE when deploying in docker -->
                 <version>4.1</version>
                 <configuration>
                     <properties>
diff --git a/src/it/test-projects/creedengo-python-plugin-test-project/pom.xml b/src/it/test-projects/creedengo-python-plugin-test-project/pom.xml
index b42f947..5009f12 100644
--- a/src/it/test-projects/creedengo-python-plugin-test-project/pom.xml
+++ b/src/it/test-projects/creedengo-python-plugin-test-project/pom.xml
@@ -10,7 +10,7 @@
     <name>creedengo Python Sonar Plugin Test Project</name>
 
     <properties>
-        <java.version>17</java.version>
+        <java.version>11</java.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
 
diff --git a/src/main/java/org/greencodeinitiative/creedengo/python/checks/DictionaryItemsUnused.java b/src/main/java/org/greencodeinitiative/creedengo/python/checks/DictionaryItemsUnused.java
index 3fc6302..e481b45 100644
--- a/src/main/java/org/greencodeinitiative/creedengo/python/checks/DictionaryItemsUnused.java
+++ b/src/main/java/org/greencodeinitiative/creedengo/python/checks/DictionaryItemsUnused.java
@@ -79,7 +79,8 @@ private boolean isItemsCall(Expression expr) {
     }
 
     private void trackNameUsages(Tree node, ItemsLoopInfo info) {
-        if (node instanceof Name nodeName) {
+        if (node instanceof Name) {
+            Name nodeName = (Name) node;
             info.markUsage(nodeName.name());
         }
 
diff --git a/src/main/java/org/greencodeinitiative/creedengo/python/utils/UtilsAST.java b/src/main/java/org/greencodeinitiative/creedengo/python/utils/UtilsAST.java
index 0818805..40e3880 100644
--- a/src/main/java/org/greencodeinitiative/creedengo/python/utils/UtilsAST.java
+++ b/src/main/java/org/greencodeinitiative/creedengo/python/utils/UtilsAST.java
@@ -102,8 +102,10 @@ public static RegularArgument nthArgumentOrKeyword(int argPosition, String keywo
     }
 
     private static boolean hasKeyword(Argument argument, String keyword) {
-        return argument instanceof RegularArgument regularArgument &&
-                Optional.ofNullable(regularArgument.keywordArgument())
+        if (! (argument instanceof RegularArgument))
+            return false;
+        RegularArgument regularArgument = (RegularArgument) argument;
+        return Optional.ofNullable(regularArgument.keywordArgument())
                         .map(Name::name)
                         .filter(name -> name.equals(keyword))
                         .isPresent();