diff --git a/main/pom.xml b/main/pom.xml
index 1d791958d..040153a5c 100644
--- a/main/pom.xml
+++ b/main/pom.xml
@@ -190,12 +190,12 @@
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-log4j12</artifactId>
-      <version>1.7.18</version>
+      <version>${slf4j.version}</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
-      <version>1.7.30</version>
+      <version>${slf4j.version}</version>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>
diff --git a/pom.xml b/pom.xml
index b33029507..d4ae196f9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -60,6 +60,7 @@
     <surefireArgs></surefireArgs>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <jackson.version>2.11.0</jackson.version>
+    <slf4j.version>1.7.30</slf4j.version>
   </properties>
 
 
diff --git a/server/pom.xml b/server/pom.xml
index 9deeff091..9fccead46 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -185,12 +185,12 @@
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-log4j12</artifactId>
-      <version>1.7.18</version>
+      <version>${slf4j.version}</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
-      <version>1.7.30</version>
+      <version>${slf4j.version}</version>
     </dependency>
   </dependencies>
 </project>