diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3d28d50..aa5266b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ '11', '17' ]
+        java: [ '17' ]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/build.gradle b/build.gradle
index 8df48d2..67ddc8b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,8 +18,8 @@ dependencies {
 compileJava.options.encoding = 'UTF-8'
 compileTestJava.options.encoding = 'UTF-8'
 
-sourceCompatibility = 11
-targetCompatibility = 11
+sourceCompatibility = 17
+targetCompatibility = 17
 
 description = 'Export Structurizr models and views to external formats'
 group = 'com.structurizr'