diff --git a/pom.xml b/pom.xml
index 4bd0205..8d63996 100644
--- a/pom.xml
+++ b/pom.xml
@@ -88,6 +88,13 @@
             <groupId>org.springframework.session</groupId>
             <artifactId>spring-session-data-redis</artifactId>
         </dependency>
+
+        <!-- https://mvnrepository.com/artifact/com.github.ben-manes.caffeine/caffeine -->
+        <dependency>
+            <groupId>com.github.ben-manes.caffeine</groupId>
+            <artifactId>caffeine</artifactId>
+            <version>3.1.8</version>
+        </dependency>
     </dependencies>