diff --git a/.circleci/config.yml b/.circleci/config.yml
index caf0a50..20fd6d1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -17,11 +17,11 @@ defaults_bld: &defaults_bld
         command: ./bld compile test
 
 jobs:
-  bld_jdk20:
+  bld_jdk21:
     <<: *defaults
 
     docker:
-      - image: cimg/openjdk:20.0
+      - image: cimg/openjdk:21.0
 
     <<: *defaults_bld
 
@@ -38,4 +38,4 @@ workflows:
   bld:
     jobs:
       - bld_jdk17
-      - bld_jdk20
+      - bld_jdk21