diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 79c9cd7ab..fc1bf3cd3 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -18,8 +18,8 @@ jobs:
     - name: Set up JDK
       uses: actions/setup-java@v2
       with:
-        java-version: 14
-        distribution: 'zulu'
+        java-version: 17
+        distribution: 'temurin'
             
     - name: Run Tests
       run: mvn test -B
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index b17b71689..4b44456b2 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -11,8 +11,8 @@ jobs:
       - name: Set up Maven Central Repository
         uses: actions/setup-java@v2
         with:
-          java-version: '14'
-          distribution: 'zulu'
+          java-version: '17'
+          distribution: 'temurin'
       - name: Set maven settings.xml
         uses: whelk-io/maven-settings-xml-action@v20
         with:
diff --git a/.github/workflows/spotless.yml b/.github/workflows/spotless.yml
index fbb86aaa3..968b4ad8c 100644
--- a/.github/workflows/spotless.yml
+++ b/.github/workflows/spotless.yml
@@ -18,8 +18,8 @@ jobs:
     - name: Set up JDK
       uses: actions/setup-java@v2
       with:
-        java-version: 14
-        distribution: 'zulu'
+        java-version: 17
+        distribution: 'temurin'
       
     - name: Check with Spotless
       run: mvn clean spotless:check
diff --git a/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/A/Java17.java b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/A/Java17.java
new file mode 100644
index 000000000..2a7edf8fa
--- /dev/null
+++ b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/A/Java17.java
@@ -0,0 +1,42 @@
+public class Java17 {
+
+	public Java17() {
+		Shape s = Math.random() > 0.5 ? new Circle(42) : new Rect(1, 4);
+		Shape c = new Circle(432);
+		Shape r = new Rect(1, 2);
+		double area = s.area() + c.area() + r.area();
+		System.out.println(area);
+	}
+
+	private abstract static sealed class Shape permits Circle, Rect {
+		public abstract double area();
+	}
+
+	private static final class Circle extends Shape {
+		private double r;
+
+		private Circle(double r) {
+			this.r = r;
+		}
+
+		@Override
+		public double area() {
+			return 2 * Math.PI * r * r;
+		}
+	}
+
+	private static final class Rect extends Shape {
+		private final int a;
+		private final int b;
+
+		private Rect(int a, int b) {
+			this.a = a;
+			this.b = b;
+		}
+
+		@Override
+		public double area() {
+			return a * b;
+		}
+	}
+}
diff --git a/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/A/Java17Preview.java b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/A/Java17Preview.java
new file mode 100644
index 000000000..00cc243ca
--- /dev/null
+++ b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/A/Java17Preview.java
@@ -0,0 +1,44 @@
+public class Java17Preview {
+
+	public Java17Preview() {
+		Shape s = Math.random() > 0.5 ? new Circle(42) : new Rect(1, 4);
+		double area = switch (s) {
+			case Circle c -> c.area() + 0.123;
+			case Rect r -> r.area() + r.area();
+		};
+
+		System.out.println(area);
+	}
+
+	private abstract static sealed class Shape permits Circle, Rect {
+		public abstract double area();
+	}
+
+	private static final class Circle extends Shape {
+		private double r;
+
+		private Circle(double r) {
+			this.r = r;
+		}
+
+		@Override
+		public double area() {
+			return 2 * Math.PI * r * r;
+		}
+	}
+
+	private static final class Rect extends Shape {
+		private final int a;
+		private final int b;
+
+		private Rect(int a, int b) {
+			this.a = a;
+			this.b = b;
+		}
+
+		@Override
+		public double area() {
+			return a * b;
+		}
+	}
+}
diff --git a/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/B/Java17.java b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/B/Java17.java
new file mode 100644
index 000000000..f09bde3be
--- /dev/null
+++ b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/B/Java17.java
@@ -0,0 +1,42 @@
+public class Java17 {
+
+	public Java17() {
+		Shape s = Math.random() > 0.6 ? new Circle(5435) : new Rect(54, 4);
+		Shape c = new Circle(43425);
+		Shape r = new Rect(14, 21);
+		double area = s.area() + c.area() + r.area();
+		System.out.println(area);
+	}
+
+	private abstract static sealed class Shape permits Circle, Rect {
+		public abstract double area();
+	}
+
+	private static final class Circle extends Shape {
+		private double r;
+
+		private Circle(double r) {
+			this.r = r;
+		}
+
+		@Override
+		public double area() {
+			return 2 * Math.PI * r * r;
+		}
+	}
+
+	private static final class Rect extends Shape {
+		private final int a;
+		private final int b;
+
+		private Rect(int a, int b) {
+			this.a = a;
+			this.b = b;
+		}
+
+		@Override
+		public double area() {
+			return a * b;
+		}
+	}
+}
diff --git a/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/B/Java17Preview.java b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/B/Java17Preview.java
new file mode 100644
index 000000000..76be4842c
--- /dev/null
+++ b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/B/Java17Preview.java
@@ -0,0 +1,44 @@
+public class Java17Preview {
+
+	public Java17Preview() {
+		Shape s = Math.random() > 0.5 ? new Circle(24) : new Rect(5, 1);
+		double area = switch (s) {
+			case Circle c -> c.area() + 2.345;
+			case Rect r -> r.area() + r.area();
+		};
+
+		System.out.println(area);
+	}
+
+	private abstract static sealed class Shape permits Circle, Rect {
+		public abstract double area();
+	}
+
+	private static final class Circle extends Shape {
+		private double r;
+
+		private Circle(double r) {
+			this.r = r;
+		}
+
+		@Override
+		public double area() {
+			return 2 * Math.PI * r * r;
+		}
+	}
+
+	private static final class Rect extends Shape {
+		private final int a;
+		private final int b;
+
+		private Rect(int a, int b) {
+			this.a = a;
+			this.b = b;
+		}
+
+		@Override
+		public double area() {
+			return a * b;
+		}
+	}
+}
diff --git a/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/blacklist.txt b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/blacklist.txt
index e3701b145..163769f63 100644
--- a/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/blacklist.txt
+++ b/jplag/src/test/resources/de/jplag/samples/NewJavaFeatures/blacklist.txt
@@ -1 +1 @@
-Java16.java
\ No newline at end of file
+Java17Preview.java
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index b17856672..ec0a4f401 100644
--- a/pom.xml
+++ b/pom.xml
@@ -79,8 +79,8 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>14</maven.compiler.source>
-        <maven.compiler.target>14</maven.compiler.target>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
         <spotless.version>2.21.0</spotless.version>
     </properties>
     <dependencyManagement>