diff --git a/build.xml b/build.xml
index f5898b1a7..3fd09f7f4 100644
--- a/build.xml
+++ b/build.xml
@@ -18,7 +18,7 @@
     </path>
 
     <target name="compile" depends="init">
-        <javac destdir="${out}" encoding="UTF-8" debug="true" source="1.7" target="1.7" includeAntRuntime="false" nowarn="on" deprecation="off">
+        <javac destdir="${out}" encoding="UTF-8" debug="true" source="1.8" target="1.8" includeAntRuntime="false" nowarn="on" deprecation="off">
             <classpath refid="fizteh.classpath"/>
             <src refid="fizteh.sourcepath"/>
             <include name="**/*.java"/>
@@ -34,7 +34,7 @@
     </target>
 
     <target name="run.checkstyle" description="Checkstyle utility (code conventions)">
-        <taskdef resource="checkstyletask.properties" classpath="lib/checkstyle-5.6-all.jar"/>
+        <taskdef resource="checkstyletask.properties" classpath="lib/checkstyle-5.9-SNAPSHOT-all.jar"/>
 
         <checkstyle
                 config="lib/checkstyle-rules.xml"
diff --git a/lib/checkstyle-5.6-all.jar b/lib/checkstyle-5.6-all.jar
deleted file mode 100644
index ed785c2c3..000000000
Binary files a/lib/checkstyle-5.6-all.jar and /dev/null differ
diff --git a/lib/checkstyle-5.9-SNAPSHOT-all.jar b/lib/checkstyle-5.9-SNAPSHOT-all.jar
new file mode 100644
index 000000000..8efac779e
Binary files /dev/null and b/lib/checkstyle-5.9-SNAPSHOT-all.jar differ