diff --git a/server/ssh-key-signer-server/pom.xml b/server/ssh-key-signer-server/pom.xml
index cf20f6f..ed8f704 100644
--- a/server/ssh-key-signer-server/pom.xml
+++ b/server/ssh-key-signer-server/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.6</version>
+        <version>4.0.0</version>
         <relativePath />
     </parent>