diff --git a/core-java-modules/core-java-os/pom.xml b/core-java-modules/core-java-os/pom.xml
index 04db6a53f3..d088014816 100644
--- a/core-java-modules/core-java-os/pom.xml
+++ b/core-java-modules/core-java-os/pom.xml
@@ -1,99 +1,100 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <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>
-    <artifactId>core-java-os</artifactId>
-    <version>0.1.0-SNAPSHOT</version>
-    <name>core-java-os</name>
-    <packaging>jar</packaging>
+	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>
+	<artifactId>core-java-os</artifactId>
+	<version>0.1.0-SNAPSHOT</version>
+	<name>core-java-os</name>
+	<packaging>jar</packaging>
 
-    <parent>
-        <groupId>com.baeldung.core-java-modules</groupId>
-        <artifactId>core-java-modules</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../</relativePath>
-    </parent>
+	<parent>
+		<groupId>com.baeldung.core-java-modules</groupId>
+		<artifactId>core-java-modules</artifactId>
+		<version>0.0.1-SNAPSHOT</version>
+		<relativePath>../</relativePath>
+	</parent>
 
-    <dependencies>
-	    <dependency>
+	<dependencies>
+		<dependency>
 			<groupId>org.junit.jupiter</groupId>
 			<artifactId>junit-jupiter-engine</artifactId>
-			<version>5.7.2</version>
+			<version>${junit-jupiter-engine.version}</version>
 			<scope>test</scope>
 		</dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-collections4</artifactId>
-            <version>${commons-collections4.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>${commons-io.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>log4j</groupId>
-            <artifactId>log4j</artifactId>
-            <version>${log4j.version}</version>
-        </dependency>
-        <!-- test scoped -->
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>${assertj.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.unix4j</groupId>
-            <artifactId>unix4j-command</artifactId>
-            <version>${unix4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.googlecode.grep4j</groupId>
-            <artifactId>grep4j</artifactId>
-            <version>${grep4j.version}</version>
-        </dependency>
-    </dependencies>
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-collections4</artifactId>
+			<version>${commons-collections4.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>commons-io</groupId>
+			<artifactId>commons-io</artifactId>
+			<version>${commons-io.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-lang3</artifactId>
+			<version>${commons-lang3.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>log4j</groupId>
+			<artifactId>log4j</artifactId>
+			<version>${log4j.version}</version>
+		</dependency>
+		<!-- test scoped -->
+		<dependency>
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<version>${assertj.version}</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.unix4j</groupId>
+			<artifactId>unix4j-command</artifactId>
+			<version>${unix4j.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>com.googlecode.grep4j</groupId>
+			<artifactId>grep4j</artifactId>
+			<version>${grep4j.version}</version>
+		</dependency>
+	</dependencies>
 
-    <build>
-        <finalName>core-java-os</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <source>${maven.compiler.source}</source>
-                    <target>${maven.compiler.target}</target>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
+	<build>
+		<finalName>core-java-os</finalName>
+		<resources>
+			<resource>
+				<directory>src/main/resources</directory>
+				<filtering>true</filtering>
+			</resource>
+		</resources>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>${maven-compiler-plugin.version}</version>
+				<configuration>
+					<source>${maven.compiler.source}</source>
+					<target>${maven.compiler.target}</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
 
-    <properties>
-        <!-- util -->
-        <commons-collections4.version>4.1</commons-collections4.version>
-        <collections-generic.version>4.01</collections-generic.version>
-        <!-- testing -->
-        <assertj.version>3.6.1</assertj.version>
-        <asspectj.version>1.8.9</asspectj.version>
-        <maven.compiler.source>1.9</maven.compiler.source>
-        <maven.compiler.target>1.9</maven.compiler.target>
-        <guava.version>25.1-jre</guava.version>
-        <unix4j.version>0.4</unix4j.version>
-        <grep4j.version>1.8.7</grep4j.version>
-    </properties>
+	<properties>
+		<!-- util -->
+		<commons-collections4.version>4.1</commons-collections4.version>
+		<collections-generic.version>4.01</collections-generic.version>
+		<!-- testing -->
+		<assertj.version>3.6.1</assertj.version>
+		<asspectj.version>1.8.9</asspectj.version>
+		<maven.compiler.source>1.9</maven.compiler.source>
+		<maven.compiler.target>1.9</maven.compiler.target>
+		<guava.version>25.1-jre</guava.version>
+		<unix4j.version>0.4</unix4j.version>
+		<grep4j.version>1.8.7</grep4j.version>
+		<junit-jupiter-engine.version>5.7.2</junit-jupiter-engine.version>
+	</properties>
 
 </project>
\ No newline at end of file