diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cb9a89479..350c3cdb3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,7 +26,6 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           java-version: |
-            11
             17
           distribution: 'zulu'
           cache: 'gradle'
@@ -38,7 +37,7 @@ jobs:
       - name: Build
         env:
           ORG_GRADLE_PROJECT_version: ${{ steps.build_variables.outputs.VERSION }}
-        run: ./gradlew -PenableCrossCompilerPlugin=true build --stacktrace ${{ steps.build_variables.outputs.REPO }}-web:installDist
+        run: ./gradlew build --stacktrace ${{ steps.build_variables.outputs.REPO }}-web:installDist
       - name: Build local slim container image for testing
         uses: docker/build-push-action@v6
         with:
@@ -86,28 +85,3 @@ jobs:
           tags: |
             "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ github.ref_name }}-latest-unvalidated-ubuntu"
             "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.build_variables.outputs.VERSION }}-unvalidated-ubuntu"
-      - name: Build and publish slim JRE 11 container image
-        # Only run this on repositories in the 'spinnaker' org, not on forks.
-        if: startsWith(github.repository, 'spinnaker/')
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: Dockerfile.java11.slim
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: |
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ github.ref_name }}-latest-java11-unvalidated"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.build_variables.outputs.VERSION }}-java11-unvalidated"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ github.ref_name }}-latest-java11-unvalidated-slim"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.build_variables.outputs.VERSION }}-java11-unvalidated-slim"
-      - name: Build and publish ubuntu JRE 11 container image
-        # Only run this on repositories in the 'spinnaker' org, not on forks.
-        if: startsWith(github.repository, 'spinnaker/')
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: Dockerfile.java11.ubuntu
-          push: true
-          tags: |
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ github.ref_name }}-latest-java11-unvalidated-ubuntu"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.build_variables.outputs.VERSION }}-java11-unvalidated-ubuntu"
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 6ab3de453..1a633921c 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -20,7 +20,6 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           java-version: |
-            11
             17
           distribution: 'zulu'
           cache: 'gradle'
@@ -32,7 +31,7 @@ jobs:
       - name: Build
         env:
           ORG_GRADLE_PROJECT_version: ${{ steps.build_variables.outputs.VERSION }}
-        run: ./gradlew -PenableCrossCompilerPlugin=true build ${{ steps.build_variables.outputs.REPO }}-web:installDist
+        run: ./gradlew build ${{ steps.build_variables.outputs.REPO }}-web:installDist
       - name: Build slim container image
         uses: docker/build-push-action@v6
         with:
@@ -53,26 +52,6 @@ jobs:
           tags: |
             "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:latest-ubuntu"
             "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.build_variables.outputs.VERSION }}-ubuntu"
-      - name: Build slim JRE 11 container image
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: Dockerfile.java11.slim
-          platforms: linux/amd64,linux/arm64
-          tags: |
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:latest-java11"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.build_variables.outputs.VERSION }}-java11"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:latest-java11-slim"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.build_variables.outputs.VERSION }}-java11-slim"
-      - name: Build ubuntu JRE 11 container image
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: Dockerfile.java11.ubuntu
-          platforms: linux/amd64,linux/arm64
-          tags: |
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:latest-java11-ubuntu"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.build_variables.outputs.VERSION }}-java11-ubuntu"
       - name: Build local slim container image for testing
         uses: docker/build-push-action@v6
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4ec132e3d..48db9fa9a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -24,7 +24,6 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           java-version: |
-            11
             17
           distribution: 'zulu'
           cache: 'gradle'
@@ -52,14 +51,14 @@ jobs:
           ORG_GRADLE_PROJECT_nexusPgpSigningKey: ${{ secrets.NEXUS_PGP_SIGNING_KEY }}
           ORG_GRADLE_PROJECT_nexusPgpSigningPassword: ${{ secrets.NEXUS_PGP_SIGNING_PASSWORD }}
         run: |
-          ./gradlew -PenableCrossCompilerPlugin=true --info build ${{ steps.build_variables.outputs.REPO }}-web:installDist publishToNexus closeAndReleaseNexusStagingRepository
+          ./gradlew --info build ${{ steps.build_variables.outputs.REPO }}-web:installDist publishToNexus closeAndReleaseNexusStagingRepository
       - name: Publish apt packages to Google Artifact Registry
         env:
           ORG_GRADLE_PROJECT_version: ${{ steps.release_info.outputs.RELEASE_VERSION }}
           ORG_GRADLE_PROJECT_artifactRegistryPublishEnabled: true
           GAR_JSON_KEY: ${{ secrets.GAR_JSON_KEY }}
         run: |
-          ./gradlew -PenableCrossCompilerPlugin=true --info publish
+          ./gradlew --info publish
       - name: Login to Google Cloud
         # Only run this on repositories in the 'spinnaker' org, not on forks.
         if: startsWith(github.repository, 'spinnaker/')
@@ -110,31 +109,6 @@ jobs:
           tags: |
             "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.release_info.outputs.RELEASE_VERSION }}-unvalidated-ubuntu"
             "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.release_info.outputs.RELEASE_VERSION }}-${{ steps.build_variables.outputs.VERSION }}-unvalidated-ubuntu"
-      - name: Build and publish slim JRE 11 container image
-        # Only run this on repositories in the 'spinnaker' org, not on forks.
-        if: startsWith(github.repository, 'spinnaker/')
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: Dockerfile.java11.slim
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: |
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.release_info.outputs.RELEASE_VERSION }}-java11-unvalidated"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.release_info.outputs.RELEASE_VERSION }}-java11-unvalidated-slim"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.release_info.outputs.RELEASE_VERSION }}-${{ steps.build_variables.outputs.VERSION }}-java11-unvalidated-slim"
-      - name: Build and publish ubuntu JRE 11 container image
-        # Only run this on repositories in the 'spinnaker' org, not on forks.
-        if: startsWith(github.repository, 'spinnaker/')
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: Dockerfile.java11.ubuntu
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: |
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.release_info.outputs.RELEASE_VERSION }}-java11-unvalidated-ubuntu"
-            "${{ env.CONTAINER_REGISTRY }}/${{ steps.build_variables.outputs.REPO }}:${{ steps.release_info.outputs.RELEASE_VERSION }}-${{ steps.build_variables.outputs.VERSION }}-java11-unvalidated-ubuntu"
       - name: Create release
         if: steps.release_info.outputs.SKIP_RELEASE == 'false'
         uses: softprops/action-gh-release@v2
diff --git a/Dockerfile.java11.slim b/Dockerfile.java11.slim
deleted file mode 100644
index 58a92034a..000000000
--- a/Dockerfile.java11.slim
+++ /dev/null
@@ -1,9 +0,0 @@
-# Not using the alpine image because it lacks a package gRPC needed to establish pub/sub listeners.
-FROM openjdk:11
-LABEL maintainer="sig-platform@spinnaker.io"
-RUN adduser --system --uid 10111 --group spinnaker
-COPY echo-web/build/install/echo /opt/echo
-RUN mkdir -p /opt/echo/plugins && chown -R spinnaker:nogroup /opt/echo/plugins
-USER spinnaker
-HEALTHCHECK CMD curl http://localhost:8089/health | grep UP || exit 1
-CMD ["/opt/echo/bin/echo"]
diff --git a/Dockerfile.java11.ubuntu b/Dockerfile.java11.ubuntu
deleted file mode 100644
index 1235cee0b..000000000
--- a/Dockerfile.java11.ubuntu
+++ /dev/null
@@ -1,9 +0,0 @@
-FROM ubuntu:bionic
-LABEL maintainer="sig-platform@spinnaker.io"
-RUN apt-get update && apt-get -y install curl openjdk-11-jre-headless wget
-RUN adduser --system --uid 10111 --group spinnaker
-COPY echo-web/build/install/echo /opt/echo
-RUN mkdir -p /opt/echo/plugins && chown -R spinnaker:nogroup /opt/echo/plugins
-USER spinnaker
-HEALTHCHECK CMD curl http://localhost:8089/health | grep UP || exit 1
-CMD ["/opt/echo/bin/echo"]
diff --git a/gradle.properties b/gradle.properties
index b817c97c4..886862054 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -3,7 +3,7 @@ korkVersion=7.244.0
 kotlinVersion=1.6.21
 org.gradle.parallel=true
 spinnakerGradleVersion=8.32.1
-targetJava17=false
+targetJava17=true
 
 # To enable a composite reference to a project, set the
 #  project property `'<projectName>Composite=true'`.
diff --git a/gradle/kotlin.gradle b/gradle/kotlin.gradle
index 18a7d1ee8..609b560df 100644
--- a/gradle/kotlin.gradle
+++ b/gradle/kotlin.gradle
@@ -19,14 +19,14 @@ apply plugin: "kotlin"
 compileKotlin {
   kotlinOptions {
     languageVersion = "1.6"
-    jvmTarget = "11"
+    jvmTarget = "17"
   }
 }
 
 compileTestKotlin {
   kotlinOptions {
     languageVersion = "1.6"
-    jvmTarget = "11"
+    jvmTarget = "17"
   }
 }