diff --git a/.github/workflows/initializr-e2e.yml b/.github/workflows/initializr-e2e.yml
index 8693d9bdbeb..b6071be6086 100644
--- a/.github/workflows/initializr-e2e.yml
+++ b/.github/workflows/initializr-e2e.yml
@@ -38,22 +38,30 @@ concurrency:
 
 jobs:
   download:
-    name: ${{ matrix.template }}
+    name: ${{ matrix.template }} (JDK ${{ matrix.java }})
     runs-on: ubuntu-24.04
     timeout-minutes: 75
     strategy:
       fail-fast: false
       matrix:
         template: [BAREBONES, KOTLIN, WAYLINE, SAVOR, SKIRMISH, PARLEY, BASTION, REEL]
+        java: ['17']
+        # Developers download on current JDKs too: Kotlin 1.6.0 crashed on 25
+        # ("IllegalArgumentException: 25") while every 17 leg was green.
+        include:
+          - template: KOTLIN
+            java: '25'
+          - template: SKIRMISH
+            java: '25'
     steps:
       - uses: actions/checkout@v6
 
       # No cache: the point is a developer's first build, from an empty repository.
-      - name: Set up JDK 17
+      - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v5
         with:
           distribution: 'temurin'
-          java-version: '17'
+          java-version: ${{ matrix.java }}
 
       - name: Ensure a virtual display (xvfb) for the simulator
         run: |
@@ -71,7 +79,7 @@ jobs:
         if: ${{ !cancelled() }}
         uses: actions/upload-artifact@v7
         with:
-          name: initializr-e2e-${{ matrix.template }}
+          name: initializr-e2e-${{ matrix.template }}-jdk${{ matrix.java }}
           path: |
             scripts/initializr/target/e2e-shipped/*.log
             scripts/initializr/target/e2e-shipped/*-shots/**
diff --git a/scripts/initializr/common/pom.xml b/scripts/initializr/common/pom.xml
index 3c3bbaf6825..4e9629607bc 100644
--- a/scripts/initializr/common/pom.xml
+++ b/scripts/initializr/common/pom.xml
@@ -103,7 +103,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/common/src/main/resources/barebones-pom.xml b/scripts/initializr/common/src/main/resources/barebones-pom.xml
index 8a00f1c1539..e1a096a5363 100644
--- a/scripts/initializr/common/src/main/resources/barebones-pom.xml
+++ b/scripts/initializr/common/src/main/resources/barebones-pom.xml
@@ -98,7 +98,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/common/src/main/resources/bastion-pom.xml b/scripts/initializr/common/src/main/resources/bastion-pom.xml
index 5e088517a28..c86dfe1290a 100644
--- a/scripts/initializr/common/src/main/resources/bastion-pom.xml
+++ b/scripts/initializr/common/src/main/resources/bastion-pom.xml
@@ -104,7 +104,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/common/src/main/resources/kotlin-pom.xml b/scripts/initializr/common/src/main/resources/kotlin-pom.xml
index a4878608846..4c240d95a5b 100644
--- a/scripts/initializr/common/src/main/resources/kotlin-pom.xml
+++ b/scripts/initializr/common/src/main/resources/kotlin-pom.xml
@@ -94,7 +94,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/common/src/main/resources/parley-pom.xml b/scripts/initializr/common/src/main/resources/parley-pom.xml
index 5e088517a28..c86dfe1290a 100644
--- a/scripts/initializr/common/src/main/resources/parley-pom.xml
+++ b/scripts/initializr/common/src/main/resources/parley-pom.xml
@@ -104,7 +104,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/common/src/main/resources/reel-pom.xml b/scripts/initializr/common/src/main/resources/reel-pom.xml
index 5e088517a28..c86dfe1290a 100644
--- a/scripts/initializr/common/src/main/resources/reel-pom.xml
+++ b/scripts/initializr/common/src/main/resources/reel-pom.xml
@@ -104,7 +104,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/common/src/main/resources/savor-pom.xml b/scripts/initializr/common/src/main/resources/savor-pom.xml
index 5e088517a28..c86dfe1290a 100644
--- a/scripts/initializr/common/src/main/resources/savor-pom.xml
+++ b/scripts/initializr/common/src/main/resources/savor-pom.xml
@@ -104,7 +104,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/common/src/main/resources/skirmish-pom.xml b/scripts/initializr/common/src/main/resources/skirmish-pom.xml
index 7ac42a97d4c..e1462c1e296 100644
--- a/scripts/initializr/common/src/main/resources/skirmish-pom.xml
+++ b/scripts/initializr/common/src/main/resources/skirmish-pom.xml
@@ -110,7 +110,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/common/src/main/resources/wayline-pom.xml b/scripts/initializr/common/src/main/resources/wayline-pom.xml
index 5e088517a28..c86dfe1290a 100644
--- a/scripts/initializr/common/src/main/resources/wayline-pom.xml
+++ b/scripts/initializr/common/src/main/resources/wayline-pom.xml
@@ -104,7 +104,7 @@
                 </file>
             </activation>
             <properties>
-                <kotlin.version>1.6.0</kotlin.version>
+                <kotlin.version>2.2.10</kotlin.version>
                 <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
             </properties>
             <dependencies>
diff --git a/scripts/initializr/e2e-shipped.sh b/scripts/initializr/e2e-shipped.sh
index a9e25607860..4e2ff0ecbcb 100755
--- a/scripts/initializr/e2e-shipped.sh
+++ b/scripts/initializr/e2e-shipped.sh
@@ -43,6 +43,10 @@
 # simulator: xvfb-run is used where there is one.
 set -euo pipefail
 
+# Opt out of the build telemetry: the launchers and the plugin otherwise report
+# these builds to production as if a new developer had made them.
+export CN1_TELEMETRY=0
+
 HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 ROOT="$(cd "$HERE/../.." && pwd)"
 WORK="${E2E_WORK:-$HERE/target/e2e-shipped}"