diff --git a/build.sbt b/build.sbt
index 419068ee..a33f1dfc 100644
--- a/build.sbt
+++ b/build.sbt
@@ -24,7 +24,7 @@ lazy val V =
     val requests = "0.8.0"
     val minimalMillVersion = "0.10.0"
     val millScipVersion = "0.3.6"
-    val kotlinVersion = "2.2.0"
+    val kotlinVersion = "2.3.21"
     // semanticdb-kotlinc has its own (older) protobuf-java codegen pinned to
     // 3.17.3 to keep the wire format stable for the kotlinc plugin without
     // perturbing the rest of scip-java.