diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index feb5149..8efec56 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -14,14 +14,16 @@ jobs:
     name: ${{ matrix.title }}
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         include:
-          - title: Java 11
-            java: 11
-          - title: Java 17
+          - title: Java 17 # minimally supported version, set the same in gradle.properties
             java: 17
           - title: Java 21
             java: 21
+#          todo #41
+#          - title: Java 25
+#            java: 25
     steps:
       - name: Checkout
         uses: actions/checkout@v5
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5f1aa85..9f3a8fd 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -10,7 +10,7 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
index ae5ba76..0bc45cf 100644
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -9,6 +9,16 @@
       </inspection_tool>
     </profile>
   </component>
+  <component name="IssueNavigationConfiguration">
+    <option name="links">
+      <list>
+        <IssueNavigationLink>
+          <option name="issueRegexp" value="#(\d+)" />
+          <option name="linkRegexp" value="https://github.com/dtruebin/thinking-in-java/issues/$1" />
+        </IssueNavigationLink>
+      </list>
+    </option>
+  </component>
   <component name="VcsDirectoryMappings">
     <mapping directory="$PROJECT_DIR$" vcs="Git" />
   </component>
diff --git a/gradle.properties b/gradle.properties
index 9168973..3e3ab3a 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1 +1 @@
-javaVersion=11
\ No newline at end of file
+javaVersion=17
\ No newline at end of file