diff --git a/pom.xml b/pom.xml
index 0243938..4c705db 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,58 +30,58 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>${slf4j-api.version}</version>
+            <version>1.7.12</version>
         </dependency>
 
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
-            <version>${log4j.version}</version>
+            <version>2.17.1</version>
         </dependency>
 
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-slf4j-impl</artifactId>
-            <version>${log4j.version}</version>
+            <version>2.17.1</version>
         </dependency>
 
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>${guava.version}</version>
+            <version>32.0.1-jre</version>
         </dependency>
 
         <dependency>
             <groupId>com.google.code.findbugs</groupId>
             <artifactId>jsr305</artifactId>
-            <version>${jsr305.version}</version>
+            <version>3.0.0</version>
         </dependency>
 
         <dependency>
             <groupId>org.mongodb</groupId>
             <artifactId>mongo-java-driver</artifactId>
-            <version>${mongo.verson}</version>
+            <version>3.0.3</version>
             <scope>provided</scope>
         </dependency>
 
         <dependency>
             <groupId>org.apache.tomcat</groupId>
             <artifactId>dbcp</artifactId>
-            <version>${tomcat.dbcp.version}</version>
+            <version>6.0.44</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>${h2.version}</version>
+            <version>2.2.220</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>