diff --git a/Makefile b/Makefile
index 427ffe5..d409e4b 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@
 # Makefile for mspsim
 #
 # Needed stuff in the PATH:
-#  java, javac (JDK 1.7 or newer)
+#  java, javac (JDK 11 or newer)
 #
 # Under MS-DOS/Windows
 #  A GNU compatible Make (for example Cygwin's)
@@ -46,7 +46,7 @@ SPACE := ${EMPTY} ${EMPTY}
 LIBS := ${wildcard lib/*.jar}
 BUILD := build
 CLASSPATH=${subst ${SPACE},${SEPARATOR},$(BUILD)/ ${LIBS}}
-CCARGS=-deprecation -Xlint:unchecked -source 1.7 -target 1.7 -classpath ".${SEPARATOR}${CLASSPATH}" -d $(BUILD)
+CCARGS=-deprecation -Xlint:unchecked -source 11 -target 11 -classpath ".${SEPARATOR}${CLASSPATH}" -d $(BUILD)
 
 JAVAARGS=-classpath "${CLASSPATH}"
 
diff --git a/build.xml b/build.xml
index bf768e5..5152910 100644
--- a/build.xml
+++ b/build.xml
@@ -8,8 +8,8 @@
   <property name="lib" location="lib"/>
   <property name="jarfile" location="mspsim.jar"/>
   <property name="javac.debug" value="true"/>
-  <property name="ant.build.javac.source" value="1.7"/>
-  <property name="ant.build.javac.target" value="1.7"/>
+  <property name="ant.build.javac.source" value="11"/>
+  <property name="ant.build.javac.target" value="11"/>
   <property name="ARGS" value=""/>
 
   <path id="classpath">