diff --git a/bazel/bazelapp/pom.xml b/bazel/bazelapp/pom.xml
index 9c9fb59619..e56cc06ef4 100644
--- a/bazel/bazelapp/pom.xml
+++ b/bazel/bazelapp/pom.xml
@@ -16,14 +16,17 @@
         <dependency>
             <groupId>com.baeldung</groupId>
             <artifactId>bazelgreeting</artifactId>
-            <version>1.0.0-SNAPSHOT</version>
+            <version>${bazelgreeting.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
-            <version>3.9</version>
+            <version>${commons-lang3.version}</version>
         </dependency>
     </dependencies>
 
+    <properties>
+        <bazelgreeting.version>1.0.0-SNAPSHOT</bazelgreeting.version>
+    </properties>
 
 </project>
\ No newline at end of file
diff --git a/kotlin-libraries/pom.xml b/kotlin-libraries/pom.xml
index e252329426..5299b5029e 100644
--- a/kotlin-libraries/pom.xml
+++ b/kotlin-libraries/pom.xml
@@ -100,7 +100,7 @@
         <dependency>
             <groupId>io.arrow-kt</groupId>
             <artifactId>arrow-core</artifactId>
-            <version>0.7.3</version>
+            <version>${arrow-core.version}</version>
         </dependency>
 
         <dependency>
@@ -117,7 +117,7 @@
         <dependency>
             <groupId>nl.komponents.kovenant</groupId>
             <artifactId>kovenant</artifactId>
-            <version>3.3.0</version>
+            <version>${kovenant.version}</version>
             <type>pom</type>
         </dependency>
 
@@ -132,13 +132,13 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>27.1-jre</version>
+            <version>${guava.version}</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/org.jetbrains.kotlinx/kotlinx-collections-immutable -->
         <dependency>
             <groupId>org.jetbrains.kotlinx</groupId>
             <artifactId>kotlinx-collections-immutable</artifactId>
-            <version>0.1</version>
+            <version>${kotlinx-collections-immutable.version}</version>
         </dependency>
 
         <!-- MockK dependencies-->
@@ -151,26 +151,26 @@
         <dependency>
             <groupId>net.bytebuddy</groupId>
             <artifactId>byte-buddy</artifactId>
-            <version>1.8.13</version>
+            <version>${byte-buddy.version}</version>
             <scope>compile</scope>
         </dependency>
         <dependency>
             <groupId>net.bytebuddy</groupId>
             <artifactId>byte-buddy-agent</artifactId>
-            <version>1.8.13</version>
+            <version>${byte-buddy.version}</version>
             <scope>compile</scope>
         </dependency>
         <dependency>
             <groupId>org.objenesis</groupId>
             <artifactId>objenesis</artifactId>
-            <version>2.6</version>
+            <version>${objenesis.version}</version>
             <scope>compile</scope>
         </dependency>
 
         <dependency>
             <groupId>io.reactivex.rxjava2</groupId>
             <artifactId>rxkotlin</artifactId>
-            <version>2.3.0</version>
+            <version>${rxkotlin.version}</version>
         </dependency>
     </dependencies>
 
@@ -186,6 +186,13 @@
         <assertj.version>3.10.0</assertj.version>
         <exposed.version>0.10.4</exposed.version>
         <mockk.version>1.9.3</mockk.version>
+        <guava.version>27.1-jre</guava.version>
+        <kovenant.version>3.3.0</kovenant.version>
+        <byte-buddy.version>1.8.13</byte-buddy.version>
+        <objenesis.version>2.6</objenesis.version>
+        <rxkotlin.version>2.3.0</rxkotlin.version>
+        <kotlinx-collections-immutable.version>0.1</kotlinx-collections-immutable.version>
+        <arrow-core.version>0.7.3</arrow-core.version>
     </properties>
 
 </project>
diff --git a/libraries/pom.xml b/libraries/pom.xml
index a8ded19a1e..9511563817 100644
--- a/libraries/pom.xml
+++ b/libraries/pom.xml
@@ -579,7 +579,7 @@
         <dependency>
             <groupId>org.asciidoctor</groupId>
             <artifactId>asciidoctor-maven-plugin</artifactId>
-            <version>1.5.7.1</version>
+            <version>${asciidoctor-maven-plugin.version}</version>
         </dependency>
       	<!-- Reflections -->
 		<dependency>
@@ -789,6 +789,7 @@
         <mockftpserver.version>2.7.1</mockftpserver.version>
         <commons-net.version>3.6</commons-net.version>
         <reflections.version>0.9.11</reflections.version>
+        <asciidoctor-maven-plugin.version>1.5.7.1</asciidoctor-maven-plugin.version>
 
     </properties>
 
diff --git a/oauth2-framework-impl/oauth2-authorization-server/pom.xml b/oauth2-framework-impl/oauth2-authorization-server/pom.xml
index 6ab7a60f72..25927c9f1a 100644
--- a/oauth2-framework-impl/oauth2-authorization-server/pom.xml
+++ b/oauth2-framework-impl/oauth2-authorization-server/pom.xml
@@ -18,23 +18,26 @@
         <h2.version>1.4.199</h2.version>
         <httpPort>9080</httpPort>
         <httpsPort>9443</httpsPort>
+        <nimbus-jose-jwt.version>7.3</nimbus-jose-jwt.version>
+        <bcprov-jdk15on.version>1.62</bcprov-jdk15on.version>
+        <bcpkix-jdk15on.version>1.62</bcpkix-jdk15on.version>
     </properties>
 
     <dependencies>
         <dependency>
             <groupId>com.nimbusds</groupId>
             <artifactId>nimbus-jose-jwt</artifactId>
-            <version>7.3</version>
+            <version>${nimbus-jose-jwt.version}</version>
         </dependency>
         <dependency>
             <groupId>org.bouncycastle</groupId>
             <artifactId>bcprov-jdk15on</artifactId>
-            <version>1.62</version>
+            <version>${bcprov-jdk15on.version}</version>
         </dependency>
         <dependency>
             <groupId>org.bouncycastle</groupId>
             <artifactId>bcpkix-jdk15on</artifactId>
-            <version>1.62</version>
+            <version>${bcpkix-jdk15on.version}</version>
         </dependency>
     </dependencies>
     <build>
diff --git a/oauth2-framework-impl/oauth2-resource-server/pom.xml b/oauth2-framework-impl/oauth2-resource-server/pom.xml
index e6bc860c67..5e5cd087ed 100644
--- a/oauth2-framework-impl/oauth2-resource-server/pom.xml
+++ b/oauth2-framework-impl/oauth2-resource-server/pom.xml
@@ -18,13 +18,14 @@
         <httpsPort>8643</httpsPort>
         <jwt.issuer>http://localhost:9080</jwt.issuer>
         <jwt.resourceId>http://localhost:9280</jwt.resourceId>
+        <microprofile-jwt-auth-api.version>1.1</microprofile-jwt-auth-api.version>
     </properties>
 
     <dependencies>
         <dependency>
             <groupId>org.eclipse.microprofile.jwt</groupId>
             <artifactId>microprofile-jwt-auth-api</artifactId>
-            <version>1.1</version>
+            <version>${microprofile-jwt-auth-api.version}</version>
             <scope>provided</scope>
         </dependency>
     </dependencies>
diff --git a/oauth2-framework-impl/pom.xml b/oauth2-framework-impl/pom.xml
index 47d42eaaea..fd1a2c926f 100644
--- a/oauth2-framework-impl/pom.xml
+++ b/oauth2-framework-impl/pom.xml
@@ -15,19 +15,21 @@
         <failOnMissingWebXml>false</failOnMissingWebXml>
         <openliberty.version>RELEASE</openliberty.version>
         <openliberty.maven.version>2.6.4</openliberty.maven.version>
+        <javaee-web-api.version>8.0</javaee-web-api.version>
+        <microprofile-config-api.version>1.3</microprofile-config-api.version>
     </properties>
 
     <dependencies>
         <dependency>
             <groupId>javax</groupId>
             <artifactId>javaee-web-api</artifactId>
-            <version>8.0</version>
+            <version>${javaee-web-api.version}</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.eclipse.microprofile.config</groupId>
             <artifactId>microprofile-config-api</artifactId>
-            <version>1.3</version>
+            <version>${microprofile-config-api.version}</version>
             <scope>provided</scope>
         </dependency>
     </dependencies>
diff --git a/optaplanner/pom.xml b/optaplanner/pom.xml
index 93b1e68264..bcf7080a1e 100644
--- a/optaplanner/pom.xml
+++ b/optaplanner/pom.xml
@@ -16,8 +16,12 @@
         <dependency>
             <groupId>org.optaplanner</groupId>
             <artifactId>optaplanner-core</artifactId>
-            <version>7.9.0.Final</version>
+            <version>${optaplanner-core.version}</version>
         </dependency>
     </dependencies>
 
+	<properties>
+		<optaplanner-core.version>7.9.0.Final</optaplanner-core.version>
+	</properties>
+
 </project>
\ No newline at end of file
diff --git a/persistence-modules/java-jpa/pom.xml b/persistence-modules/java-jpa/pom.xml
index ced049d281..7ce8262ba5 100644
--- a/persistence-modules/java-jpa/pom.xml
+++ b/persistence-modules/java-jpa/pom.xml
@@ -57,7 +57,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.5.1</version>
+                <version>${maven-compiler-plugin.version}</version>
                 <configuration>
                     <compilerArgument>-proc:none</compilerArgument>
                 </configuration>
@@ -65,7 +65,7 @@
 			<plugin>
 				<groupId>org.bsc.maven</groupId>
 				<artifactId>maven-processor-plugin</artifactId>
-				<version>3.3.3</version>
+				<version>${maven-processor-plugin.version}</version>
 				<executions>
 					<execution>
 						<id>process</id>
@@ -86,7 +86,7 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>build-helper-maven-plugin</artifactId>
-				<version>3.0.0</version>
+				<version>${build-helper-maven-plugin.version}</version>
 				<executions>
 					<execution>
 						<id>add-source</id>
@@ -110,6 +110,8 @@
         <eclipselink.version>2.7.4-RC1</eclipselink.version>
         <postgres.version>42.2.5</postgres.version>
         <javax.persistence-api.version>2.2</javax.persistence-api.version>
+        <maven-processor-plugin.version>3.3.3</maven-processor-plugin.version>
+        <build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
     </properties>
 
 </project>
\ No newline at end of file
diff --git a/persistence-modules/r2dbc/pom.xml b/persistence-modules/r2dbc/pom.xml
index 388abafdaf..fd48a47f12 100644
--- a/persistence-modules/r2dbc/pom.xml
+++ b/persistence-modules/r2dbc/pom.xml
@@ -17,6 +17,7 @@
 
 	<properties>
 		<java.version>1.8</java.version>
+		<r2dbc-h2.version>0.8.0.M8</r2dbc-h2.version>
 	</properties>
 
 	<dependencies>
@@ -41,7 +42,7 @@
 		<dependency>
 			<groupId>io.r2dbc</groupId>
 			<artifactId>r2dbc-h2</artifactId>
-			<version>0.8.0.M8</version>
+			<version>${r2dbc-h2.version}</version>
 		</dependency>
 
 		<dependency>
diff --git a/persistence-modules/sirix/pom.xml b/persistence-modules/sirix/pom.xml
index 677c5b8f3a..8de961120f 100644
--- a/persistence-modules/sirix/pom.xml
+++ b/persistence-modules/sirix/pom.xml
@@ -20,7 +20,7 @@
 		<dependency>
 			<groupId>io.sirix</groupId>
 			<artifactId>sirix-core</artifactId>
-			<version>0.9.3</version>
+			<version>${sirix-core.version}</version>
 		</dependency>
 	</dependencies>
 
@@ -48,5 +48,6 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<maven.release.version>11</maven.release.version>
+		<sirix-core.version>0.9.3</sirix-core.version>
 	</properties>
 </project>
diff --git a/persistence-modules/spring-boot-mysql/pom.xml b/persistence-modules/spring-boot-mysql/pom.xml
index 6be58332aa..29374ec116 100644
--- a/persistence-modules/spring-boot-mysql/pom.xml
+++ b/persistence-modules/spring-boot-mysql/pom.xml
@@ -17,7 +17,6 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
-            <version>2.1.5.RELEASE</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
diff --git a/persistence-modules/spring-persistence-simple/pom.xml b/persistence-modules/spring-persistence-simple/pom.xml
index d0b3f5fe29..f0cf8e49d5 100644
--- a/persistence-modules/spring-persistence-simple/pom.xml
+++ b/persistence-modules/spring-persistence-simple/pom.xml
@@ -116,7 +116,7 @@
             <plugin>
                 <groupId>com.mysema.maven</groupId>
                 <artifactId>apt-maven-plugin</artifactId>
-                <version>1.1.3</version>
+                <version>${apt-maven-plugin.version}</version>
                 <executions>
                     <execution>
                         <phase>generate-sources</phase>
@@ -148,6 +148,7 @@
         <!-- util -->
         <guava.version>21.0</guava.version>
         <assertj.version>3.8.0</assertj.version>
+        <apt-maven-plugin.version>1.1.3</apt-maven-plugin.version>
     </properties>
 
 </project>
\ No newline at end of file
diff --git a/spring-boot-custom-starter/greeter-spring-boot-autoconfigure/pom.xml b/spring-boot-custom-starter/greeter-spring-boot-autoconfigure/pom.xml
index 1e4ee698c6..74e786be99 100644
--- a/spring-boot-custom-starter/greeter-spring-boot-autoconfigure/pom.xml
+++ b/spring-boot-custom-starter/greeter-spring-boot-autoconfigure/pom.xml
@@ -44,7 +44,7 @@
         <dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>
-			<version>1.5.10.RELEASE</version>
+			<version>${spring-boot.version}</version>
 			<scope>test</scope>
 		</dependency>
 
diff --git a/spring-boot-data/pom.xml b/spring-boot-data/pom.xml
index 9c11e09f4a..4af0acc3c0 100644
--- a/spring-boot-data/pom.xml
+++ b/spring-boot-data/pom.xml
@@ -18,25 +18,22 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-redis</artifactId>
-            <version>2.1.6.RELEASE</version>
         </dependency>
 
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-mongodb</artifactId>
-            <version>2.1.6.RELEASE</version>
         </dependency>
 
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
-            <version>2.1.6.RELEASE</version>
         </dependency>
 
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>1.4.197</version>
+            <version>${h2.version}</version>
         </dependency>
 
         <dependency>
diff --git a/spring-boot-logging-log4j2/pom.xml b/spring-boot-logging-log4j2/pom.xml
index 64696969ca..8e4bf60f91 100644
--- a/spring-boot-logging-log4j2/pom.xml
+++ b/spring-boot-logging-log4j2/pom.xml
@@ -37,7 +37,7 @@
         <dependency>
         	<groupId>org.projectlombok</groupId>
         	<artifactId>lombok</artifactId>
-        	<version>1.18.4</version>
+        	<version>${lombok.version}</version>
         	<scope>provided</scope>
     	</dependency>
         
@@ -79,5 +79,6 @@
         <start-class>com.baeldung.springbootlogging.SpringBootLoggingApplication</start-class>
 		<spring-boot-starter-log4j.version>1.3.8.RELEASE</spring-boot-starter-log4j.version>
 		<gelfj.version>1.1.16</gelfj.version>
+		<lombok.version>1.18.4</lombok.version>
     </properties>
 </project>
diff --git a/spring-boot-mvc-birt/pom.xml b/spring-boot-mvc-birt/pom.xml
index bf6bbbf71d..3532b20c15 100644
--- a/spring-boot-mvc-birt/pom.xml
+++ b/spring-boot-mvc-birt/pom.xml
@@ -48,19 +48,19 @@
         <dependency>
             <groupId>com.innoventsolutions.birt.runtime</groupId>
             <artifactId>org.eclipse.birt.runtime_4.8.0-20180626</artifactId>
-            <version>4.8.0</version>
+            <version>${eclipse.birt.runtime.version}</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/log4j/log4j -->
         <dependency>
             <groupId>log4j</groupId>
             <artifactId>log4j</artifactId>
-            <version>1.2.17</version>
+            <version>${log4j.version}</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
-            <version>1.18.6</version>
+            <version>${lombok.version}</version>
             <scope>provided</scope>
         </dependency>
 
@@ -80,6 +80,7 @@
         <start-class>com.baeldung.birt.engine.ReportEngineApplication</start-class>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
+        <eclipse.birt.runtime.version>4.8.0</eclipse.birt.runtime.version>
     </properties>
 
 </project>
diff --git a/spring-cloud/spring-cloud-stream/spring-cloud-stream-kafka/pom.xml b/spring-cloud/spring-cloud-stream/spring-cloud-stream-kafka/pom.xml
index 13ad18810e..18bc426364 100644
--- a/spring-cloud/spring-cloud-stream/spring-cloud-stream-kafka/pom.xml
+++ b/spring-cloud/spring-cloud-stream/spring-cloud-stream-kafka/pom.xml
@@ -18,6 +18,8 @@
     <properties>
         <java.version>1.8</java.version>
         <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
+        <kafka-avro-serializer.version>4.0.0</kafka-avro-serializer.version>
+        <avro.version>1.8.2</avro.version>
     </properties>
 
     <dependencies>
@@ -41,19 +43,19 @@
         <dependency>
             <groupId>io.confluent</groupId>
             <artifactId>kafka-avro-serializer</artifactId>
-            <version>4.0.0</version>
+            <version>${kafka-avro-serializer.version}</version>
         </dependency>
 
         <dependency>
             <groupId>org.apache.avro</groupId>
             <artifactId>avro-compiler</artifactId>
-            <version>1.8.2</version>
+            <version>${avro.version}</version>
         </dependency>
 
         <dependency>
             <groupId>org.apache.avro</groupId>
             <artifactId>avro-maven-plugin</artifactId>
-            <version>1.8.2</version>
+            <version>${avro.version}</version>
         </dependency>
 
     </dependencies>
diff --git a/spring-di/pom.xml b/spring-di/pom.xml
index f3ad380778..5bcdda7371 100644
--- a/spring-di/pom.xml
+++ b/spring-di/pom.xml
@@ -66,7 +66,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-war-plugin</artifactId>
-                <version>3.2.2</version>
+                <version>${maven-war-plugin.version}</version>
                 <configuration>
                     <failOnMissingWebXml>false</failOnMissingWebXml>
                 </configuration>
diff --git a/spring-rest/pom.xml b/spring-rest/pom.xml
index 670bac9805..555eafe40a 100644
--- a/spring-rest/pom.xml
+++ b/spring-rest/pom.xml
@@ -139,7 +139,7 @@
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
-            <version>2.4</version>
+            <version>${commons-io.version}</version>
         </dependency>
         <dependency>
             <groupId>au.com.dius</groupId>
diff --git a/spring-security-kerberos/pom.xml b/spring-security-kerberos/pom.xml
index d98d0ff508..437e8566bb 100644
--- a/spring-security-kerberos/pom.xml
+++ b/spring-security-kerberos/pom.xml
@@ -28,17 +28,17 @@
 		<dependency>
 			<groupId>org.springframework.security.kerberos</groupId>
 			<artifactId>spring-security-kerberos-core</artifactId>
-			<version>1.0.1.RELEASE</version>
+			<version>${spring-security-kerberos.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.security.kerberos</groupId>
 			<artifactId>spring-security-kerberos-web</artifactId>
-			<version>1.0.1.RELEASE</version>
+			<version>${spring-security-kerberos.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.security.kerberos</groupId>
 			<artifactId>spring-security-kerberos-client</artifactId>
-			<version>1.0.1.RELEASE</version>
+			<version>${spring-security-kerberos.version}</version>
 		</dependency>
 
 		<dependency>
@@ -61,4 +61,8 @@
 			</plugin>
 		</plugins>
 	</build>
+
+    <properties>
+        <spring-security-kerberos.version>1.0.1.RELEASE</spring-security-kerberos.version>
+    </properties>
 </project>
diff --git a/testing-modules/easy-random/pom.xml b/testing-modules/easy-random/pom.xml
index 93c0027f8f..d80927c3e8 100644
--- a/testing-modules/easy-random/pom.xml
+++ b/testing-modules/easy-random/pom.xml
@@ -17,8 +17,12 @@
         <dependency>
             <groupId>org.jeasy</groupId>
             <artifactId>easy-random-core</artifactId>
-            <version>4.0.0</version>
+            <version>${easy-random-core.version}</version>
         </dependency>
     </dependencies>
 
+    <properties>
+        <easy-random-core.version>4.0.0</easy-random-core.version>
+    </properties>
+
 </project>
\ No newline at end of file