diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0cf455a..693330f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -40,16 +40,9 @@ commands:
           path: << parameters.reports-dir >>
 
 jobs:
-  bld_jdk17:
-    docker:
-      - image: cimg/openjdk:17.0
-    steps:
-      - build_and_test:
-          kotlin: 1.9.24
-
   bld_jdk21:
     docker:
-      - image: cimg/openjdk:21.0
+      - image: cimg/openjdk:23.0
     steps:
       - build_and_test:
           kotlin: 2.1.0
@@ -57,5 +50,4 @@ jobs:
 workflows:
   bld:
     jobs:
-      - bld_jdk17
-      - bld_jdk21
+      - bld_jdk23