diff --git a/pom.xml b/pom.xml
index b1c9e66..9e78ec0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,6 +40,23 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <kemitix.build.directory>target</kemitix.build.directory>
+
+        <maven-javadoc-plugin.version>2.10.3</maven-javadoc-plugin.version>
+        <maven-source-plugin.version>3.0.0</maven-source-plugin.version>
+        <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
+        <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
+        <maven-checkstyle-plugin.version>2.17</maven-checkstyle-plugin.version>
+        <checkstyle.version>6.17</checkstyle.version>
+        <sevntu-checkstyle-maven-plugin.version>1.18.0</sevntu-checkstyle-maven-plugin.version>
+        <maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version>
+        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
+        <maven-failsafe-plugin.version>2.19.1</maven-failsafe-plugin.version>
+        <maven-pmd-plugin.version>3.6</maven-pmd-plugin.version>
+        <findbugs-maven-plugin.version>3.0.3</findbugs-maven-plugin.version>
+        <jacoco-maven-plugin.version>0.7.6.201602180812</jacoco-maven-plugin.version>
+        <highwheel-maven.version>1.2</highwheel-maven.version>
+        <maven-project-info-reports-plugin.version>2.9</maven-project-info-reports-plugin.version>
+        <maven-jxr-plugin.version>2.5</maven-jxr-plugin.version>
     </properties>
 
     <developers>
@@ -60,7 +77,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-javadoc-plugin</artifactId>
-                        <version>2.10.3</version>
+                        <version>${maven-javadoc-plugin.version}</version>
                         <executions>
                             <execution>
                                 <id>attach-javadocs</id>
@@ -75,7 +92,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-source-plugin</artifactId>
-                        <version>3.0.0</version>
+                        <version>${maven-source-plugin.version}</version>
                         <executions>
                             <execution>
                                 <id>attach-sources</id>
@@ -90,7 +107,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-gpg-plugin</artifactId>
-                        <version>1.6</version>
+                        <version>${maven-gpg-plugin.version}</version>
                         <configuration>
                             <passphrase>${gpg.passphrase}</passphrase>
                         </configuration>
@@ -108,7 +125,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-deploy-plugin</artifactId>
-                        <version>2.8.2</version>
+                        <version>${maven-deploy-plugin.version}</version>
                     </plugin><!-- maven deploy-plugin -->
                 </plugins>
             </build>
@@ -134,12 +151,12 @@
                         <dependency>
                             <groupId>com.puppycrawl.tools</groupId>
                             <artifactId>checkstyle</artifactId>
-                            <version>6.17</version>
+                            <version>${checkstyle.version}</version>
                         </dependency>
                         <dependency>
                             <groupId>com.github.sevntu.checkstyle</groupId>
                             <artifactId>sevntu-checkstyle-maven-plugin</artifactId>
-                            <version>1.18.0</version>
+                            <version>${sevntu-checkstyle-maven-plugin.version}</version>
                         </dependency>
                     </dependencies>
                 </plugin><!-- maven-checkstyle-plugin -->
@@ -150,7 +167,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.5.1</version>
+                <version>${maven-compiler-plugin.version}</version>
                 <configuration>
                     <compilerArgs>
                         <arg>-Xlint:unchecked</arg>
@@ -165,13 +182,13 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.19.1</version>
+                <version>${maven-surefire-plugin.version}</version>
             </plugin><!-- maven-surefire-plugin -->
 
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-failsafe-plugin</artifactId>
-                <version>2.19.1</version>
+                <version>${maven-failsafe-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>integration-test</id>
@@ -191,7 +208,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>2.17</version>
+                <version>${maven-checkstyle-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>validate</id>
@@ -214,7 +231,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-pmd-plugin</artifactId>
-                <version>3.6</version>
+                <version>${maven-pmd-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>pmd</id>
@@ -236,7 +253,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>findbugs-maven-plugin</artifactId>
-                <version>3.0.3</version>
+                <version>${findbugs-maven-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>check</id>
@@ -251,7 +268,7 @@
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
-                <version>0.7.6.201602180812</version>
+                <version>${jacoco-maven-plugin.version}</version>
                 <executions>
                     <execution>
                         <goals>
@@ -305,7 +322,7 @@
             <plugin>
                 <groupId>org.pitest</groupId>
                 <artifactId>highwheel-maven</artifactId>
-                <version>1.2</version>
+                <version>${highwheel-maven.version}</version>
                 <executions>
                     <execution>
                         <phase>validate</phase>
@@ -323,27 +340,27 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-project-info-reports-plugin</artifactId>
-                <version>2.9</version>
+                <version>${maven-project-info-reports-plugin.version}</version>
             </plugin><!-- maven-project-info-reports-plugin -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-report-plugin</artifactId>
-                <version>2.19.1</version>
+                <version>${maven-surefire-plugin.version}</version>
             </plugin><!-- maven-surefire-report-plugin -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jxr-plugin</artifactId>
-                <version>2.5</version>
+                <version>${maven-jxr-plugin.version}</version>
             </plugin><!-- maven-jxr-plugin -->
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
-                <version>0.7.6.201602180812</version>
+                <version>${jacoco-maven-plugin.version}</version>
             </plugin><!-- jacoco-maven-plugin -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>2.17</version>
+                <version>${maven-checkstyle-plugin.version}</version>
                 <reportSets>
                     <reportSet>
                         <reports>
@@ -356,7 +373,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-pmd-plugin</artifactId>
-                <version>3.6</version>
+                <version>${maven-pmd-plugin.version}</version>
                 <configuration>
                     <linkXref>true</linkXref>
                 </configuration>
@@ -365,7 +382,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>findbugs-maven-plugin</artifactId>
-                <version>3.0.3</version>
+                <version>${findbugs-maven-plugin.version}</version>
             </plugin><!-- findbugs-maven-plugin -->
         </plugins>
     </reporting>