diff --git a/protocol/pom.xml b/protocol/pom.xml
index 72d3639..d25a86d 100644
--- a/protocol/pom.xml
+++ b/protocol/pom.xml
@@ -43,7 +43,7 @@
         <dependency>
             <groupId>it.unimi.dsi</groupId>
             <artifactId>fastutil</artifactId>
-            <version>8.4.2</version>
+            <version>8.5.9</version>
             <scope>provided</scope>
         </dependency>
     </dependencies>
diff --git a/server/pom.xml b/server/pom.xml
index 7e5286e..364e16b 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -137,7 +137,7 @@
         <dependency>
             <groupId>it.unimi.dsi</groupId>
             <artifactId>fastutil</artifactId>
-            <version>8.4.2</version>
+            <version>8.5.9</version>
             <scope>provided</scope>
         </dependency>