diff --git a/build.gradle.kts b/build.gradle.kts
index c21b3a42..d0738008 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -22,7 +22,7 @@ group = "recce.server"
 // the Gradle DSL properly. Here we pick one of the versions where multiple artifacts are released at the same time
 // and use this to bump the others consistently.
 val depDescriptors = mapOf(
-    "micronaut" to "io.micronaut:micronaut-core:3.9.4",
+    "micronaut" to "io.micronaut:micronaut-core:4.0.0",
     "restAssured" to "io.rest-assured:rest-assured:4.5.1"
 )
 val depVersions = depDescriptors.mapValues { (_, v) -> v.split(':').last() } + mapOf(