diff --git a/app/build.xml b/app/build.xml
index bef3f06b7..2fdf8afe0 100644
--- a/app/build.xml
+++ b/app/build.xml
@@ -28,8 +28,8 @@
     <!-- env used to set classpath below -->
     <property environment="env" />
 
-    <javac source="1.8"
-	   target="1.8"
+    <javac source="11"
+	   target="11"
 	   destdir="bin"
 	   excludes="**/tools/format/**"
 	   encoding="UTF-8"
diff --git a/build/jre/build.xml b/build/jre/build.xml
index 69c8109e8..414cbb1f8 100644
--- a/build/jre/build.xml
+++ b/build/jre/build.xml
@@ -22,8 +22,8 @@
       <!-- Where can I expect to find Java Mode JARs? -->
       <property name="java.mode" value="../../java/mode/" />
 
-      <javac source="1.8"
-          target="1.8"
+      <javac source="11"
+          target="11"
           srcdir="@{srcdir}"
           destdir="@{destdir}"
           debug="true"
diff --git a/core/build.xml b/core/build.xml
index 3951c7ed5..13f96e135 100644
--- a/core/build.xml
+++ b/core/build.xml
@@ -63,8 +63,8 @@
 
       <!-- link against apple.jar for the ThinkDifferent class -->
       <mkdir dir="@{destdir}" />
-      <javac source="1.8"
-  	   target="1.8"
+      <javac source="11"
+  	   target="11"
   	   encoding="UTF-8"
   	   includeAntRuntime="false"
   	   debug="true"
diff --git a/core/methods/build.xml b/core/methods/build.xml
index ad919dc77..d13a91e5d 100644
--- a/core/methods/build.xml
+++ b/core/methods/build.xml
@@ -3,14 +3,14 @@
   <target name="compile">
 
     <mkdir dir="bin" />
-    <javac source="1.8"
-           target="1.8"
+    <javac source="11"
+           target="11"
 	   srcdir="src"
            destdir="bin"
 	   debug="true"
 	   includeantruntime="true"
 	   nowarn="true">
-     
+
     </javac>
   </target>
 
diff --git a/java/build.xml b/java/build.xml
index 32893549b..a46aa4e9d 100644
--- a/java/build.xml
+++ b/java/build.xml
@@ -104,8 +104,8 @@
       <!-- env used to set classpath below -->
       <property environment="env" />
 
-      <javac source="1.8"
-  	   target="1.8"
+      <javac source="11"
+  	   target="11"
   	   destdir="@{destdir}"
   	   excludes="**/tools/format/**"
   	   encoding="UTF-8"
diff --git a/java/libraries/dxf/build.xml b/java/libraries/dxf/build.xml
index 9cb88085c..1d03fdf35 100644
--- a/java/libraries/dxf/build.xml
+++ b/java/libraries/dxf/build.xml
@@ -13,8 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
 
     <mkdir dir="bin" />
-    <javac source="1.8"
-	   target="1.8"
+    <javac source="11"
+	   target="11"
 	   srcdir="src" destdir="bin"
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
diff --git a/java/libraries/io/build.xml b/java/libraries/io/build.xml
index 0e9e10234..8d269d13b 100644
--- a/java/libraries/io/build.xml
+++ b/java/libraries/io/build.xml
@@ -1,31 +1,31 @@
 <?xml version="1.0"?>
 <project name="Processing Hardware I/O Library" default="build">
-  
+
   <target name="clean" description="Clean the build directories">
     <delete dir="bin" />
     <delete file="library/io.jar" />
   </target>
-  
+
   <target name="compile" description="Compile sources">
     <condition property="core-built">
       <available file="../../../core/library/core.jar" />
     </condition>
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
-    
+
     <mkdir dir="bin" />
-    <javac source="1.8"
-	   target="1.8"
-	   srcdir="src" destdir="bin" 
+    <javac source="11"
+	   target="11"
+	   srcdir="src" destdir="bin"
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
 	   classpath="../../../core/library/core.jar"
 	   nowarn="true"
 	   compiler="org.eclipse.jdt.core.JDTCompilerAdapter">
-      <compilerclasspath path="../../mode/org.eclipse.jdt.core.jar; 
+      <compilerclasspath path="../../mode/org.eclipse.jdt.core.jar;
                                ../../mode/jdtCompilerAdapter.jar" />
     </javac>
   </target>
-  
+
   <target name="build" depends="compile" description="Build I/O library">
     <jar basedir="bin" destfile="library/io.jar" />
   </target>
diff --git a/java/libraries/net/build.xml b/java/libraries/net/build.xml
index 40e22e7f7..064949012 100644
--- a/java/libraries/net/build.xml
+++ b/java/libraries/net/build.xml
@@ -13,8 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
 
     <mkdir dir="bin" />
-    <javac source="1.8"
-	   target="1.8"
+    <javac source="11"
+	   target="11"
 	   srcdir="src" destdir="bin"
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
diff --git a/java/libraries/pdf/build.xml b/java/libraries/pdf/build.xml
index 46b7d0408..7197f60e6 100644
--- a/java/libraries/pdf/build.xml
+++ b/java/libraries/pdf/build.xml
@@ -13,8 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
 
     <mkdir dir="bin" />
-    <javac source="1.8"
-	   target="1.8"
+    <javac source="11"
+	   target="11"
 	   srcdir="src" destdir="bin"
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
diff --git a/java/libraries/serial/build.xml b/java/libraries/serial/build.xml
index 4a50d2e60..a72a0ec79 100644
--- a/java/libraries/serial/build.xml
+++ b/java/libraries/serial/build.xml
@@ -13,8 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
 
     <mkdir dir="bin" />
-    <javac source="1.8"
-	   target="1.8"
+    <javac source="11"
+	   target="11"
 	   srcdir="src" destdir="bin"
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
diff --git a/java/libraries/svg/build.xml b/java/libraries/svg/build.xml
index 4477eedf8..99b5cb427 100644
--- a/java/libraries/svg/build.xml
+++ b/java/libraries/svg/build.xml
@@ -13,8 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
 
     <mkdir dir="bin" />
-    <javac source="1.8"
-	   target="1.8"
+    <javac source="11"
+	   target="11"
 	   srcdir="src" destdir="bin"
 	   encoding="UTF-8"
 	   includeAntRuntime="false"