diff --git a/README.md b/README.md
index 9ee848d5..0b8ae3b1 100644
--- a/README.md
+++ b/README.md
@@ -29,17 +29,14 @@ The source code for all examples can be found in the directory [src/main/java/la
 * Appendix D: Lambdas and JVM bytecode
 We will update the repository as we update the book. Stay tuned!
 
-### Make sure to have JDK8 installed
-The latest binary can be found here: http://www.oracle.com/technetwork/java/javase/overview/java8-2100321.html
+### Make sure to have JDK 11+ installed
+The latest binary can be found here: https://adoptium.net/temurin/releases/?version=11
 
 $ java -version
 
-java version "1.8.0_05"
-Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
-Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)
-
-
-You can download a preview version here: https://jdk8.java.net/
+openjdk version "11.0.x"
+OpenJDK Runtime Environment (build 11.0.x+x)
+OpenJDK 64-Bit Server VM (build 11.0.x+x, mixed mode)
 
 ### Compile/Run the examples
 Using maven:
diff --git a/pom.xml b/pom.xml
index 10e5035e..cb7eacf5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,18 +10,19 @@
     
     <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+      <maven.compiler.release>11</maven.compiler.release>
     </properties>
 
   <dependencies>
     <dependency>
       <groupId>org.openjdk.jmh</groupId>
       <artifactId>jmh-core</artifactId>
-      <version>1.17.4</version>
+      <version>1.37</version>
     </dependency>
     <dependency>
       <groupId>org.openjdk.jmh</groupId>
       <artifactId>jmh-generator-annprocess</artifactId>
-      <version>1.17.4</version>
+      <version>1.37</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>
@@ -35,10 +36,9 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.1</version>
+        <version>3.11.0</version>
         <configuration>
-          <source>1.9</source>
-          <target>1.9</target>
+          <release>11</release>
         </configuration>
       </plugin>
       <plugin>
diff --git a/src/main/java/lambdasinaction/chap11/Util.java b/src/main/java/lambdasinaction/chap11/Util.java
index a72c4d33..0fce0140 100644
--- a/src/main/java/lambdasinaction/chap11/Util.java
+++ b/src/main/java/lambdasinaction/chap11/Util.java
@@ -25,7 +25,7 @@ public static void delay() {
 
     public static double format(double number) {
         synchronized (formatter) {
-            return new Double(formatter.format(number));
+            return Double.parseDouble(formatter.format(number));
         }
     }