diff --git a/pom.xml b/pom.xml
index 5c96bce..348ec54 100644
--- a/pom.xml
+++ b/pom.xml
@@ -49,7 +49,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-core</artifactId>
-            <version>1.2.3</version>
+            <version>1.3.15</version>
         </dependency>
 
         <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
@@ -62,20 +62,20 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.2.3</version>
+            <version>1.3.15</version>
         </dependency>
 
         <!-- junit -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-engine</artifactId>
-            <version>${junit.jupiter.version}</version>
+            <version>5.5.2</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>1.5.2</version>
             <scope>test</scope>
         </dependency>