diff --git a/04_recycler/server/build.gradle.kts b/04_recycler/server/build.gradle.kts
index 0b122d5ec..de13a3943 100644
--- a/04_recycler/server/build.gradle.kts
+++ b/04_recycler/server/build.gradle.kts
@@ -1,7 +1,7 @@
 plugins {
     id("org.springframework.boot") version "4.0.1"
     id("io.spring.dependency-management") version "1.1.7"
-    val kotlinVersion = "2.3.0"
+    val kotlinVersion = "2.3.20"
     id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
     kotlin("jvm") version kotlinVersion
     kotlin("plugin.spring") version kotlinVersion