diff --git a/pom.xml b/pom.xml
index 21756e0..df90956 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,63 +1,67 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
 
-	<groupId>pl.waw.ipipan.zil.summ</groupId>
-	<artifactId>eval</artifactId>
-	<version>1.0</version>
+    <groupId>pl.waw.ipipan.zil.summ</groupId>
+    <artifactId>eval</artifactId>
+    <version>1.0</version>
 
-	<properties>
-		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<java.version.build>1.8</java.version.build>
-	</properties>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <java.version.build>1.8</java.version.build>
+    </properties>
 
-	<developers>
-		<developer>
-			<name>Mateusz Kopeć</name>
-			<organization>ICS PAS</organization>
-			<email>m.kopec@ipipan.waw.pl</email>
-		</developer>
-	</developers>
+    <developers>
+        <developer>
+            <name>Mateusz Kopeć</name>
+            <organization>ICS PAS</organization>
+            <email>m.kopec@ipipan.waw.pl</email>
+        </developer>
+    </developers>
 
-	<dependencies>
-		<dependency>
-			<groupId>org.apache.logging.log4j</groupId>
-			<artifactId>log4j-core</artifactId>
-			<version>2.3</version>
-		</dependency>
-		<dependency>
-			<groupId>junit</groupId>
-			<artifactId>junit</artifactId>
-			<version>4.12</version>
-		</dependency>
-		<dependency>
-			<groupId>com.google.guava</groupId>
-			<artifactId>guava</artifactId>
-			<version>18.0</version>
-		</dependency>
-		<dependency>
-			<groupId>org.apache.commons</groupId>
-			<artifactId>commons-math3</artifactId>
-			<version>3.5</version>
-		</dependency>
-		<dependency>
-			<groupId>org.apache.commons</groupId>
-			<artifactId>commons-lang3</artifactId>
-			<version>3.4</version>
-		</dependency>
-	</dependencies>
+    <prerequisites>
+        <maven>3.0.5</maven>
+    </prerequisites>
 
-	<build>
-		<plugins>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.1</version>
-				<configuration>
-					<source>${java.version.build}</source>
-					<target>${java.version.build}</target>
-				</configuration>
-			</plugin>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.8.2</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>21.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-math3</artifactId>
+            <version>3.6.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.5</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.6.1</version>
+                <configuration>
+                    <source>${java.version.build}</source>
+                    <target>${java.version.build}</target>
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-assembly-plugin</artifactId>
@@ -84,18 +88,18 @@
                     </execution>
                 </executions>
             </plugin>
-		</plugins>
-	</build>
+        </plugins>
+    </build>
 
-	<distributionManagement>
-		<repository>
-			<id>deployment</id>
-			<url>http://maven.nlp.ipipan.waw.pl/content/repositories/releases/</url>
-		</repository>
-		<snapshotRepository>
-			<id>deployment</id>
-			<url>http://maven.nlp.ipipan.waw.pl/content/repositories/snapshots/</url>
-		</snapshotRepository>
-	</distributionManagement>
+    <distributionManagement>
+        <repository>
+            <id>deployment</id>
+            <url>http://maven.nlp.ipipan.waw.pl/content/repositories/releases/</url>
+        </repository>
+        <snapshotRepository>
+            <id>deployment</id>
+            <url>http://maven.nlp.ipipan.waw.pl/content/repositories/snapshots/</url>
+        </snapshotRepository>
+    </distributionManagement>
 
 </project>
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