diff --git a/.circleci/config.yml b/.circleci/config.yml
index 2ed37a3..0cf455a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -52,11 +52,10 @@ jobs:
       - image: cimg/openjdk:21.0
     steps:
       - build_and_test:
-          kotlin: 2.0.21
+          kotlin: 2.1.0
 
 workflows:
   bld:
     jobs:
       - bld_jdk17
       - bld_jdk21
-