diff --git a/.circleci/config.yml b/.circleci/config.yml
index a3fe3a33..1f1a007a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,7 +2,7 @@ version: 2
 jobs:
   build_gcc48_opentracing_15:
     docker:
-      - image: ubuntu:18.04
+      - image: ubuntu:24.04
     environment:
       OPENTRACING_VERSION: v1.5.1
     steps:
@@ -13,7 +13,7 @@ jobs:
       - run: ./ci/do_ci.sh build
   build_gcc48_opentracing_16:
     docker:
-      - image: ubuntu:18.04
+      - image: ubuntu:24.04
     environment:
       OPENTRACING_VERSION: v1.6.0
     steps: