diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9ec6a39..94835f5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -210,7 +210,7 @@ jobs:
   bazel-ubuntu:
     name: bazel ubuntu amd64
     runs-on: ubuntu-latest
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     steps:
       - name: setup
         run: |
@@ -242,7 +242,7 @@ jobs:
   bazel-ubuntu-arm64:
     name: bazel ubuntu arm64
     runs-on: ubuntu-24.04-arm
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     steps:
       - name: setup
         run: |
@@ -540,7 +540,7 @@ jobs:
   cmake-ubuntu:
     name: cmake ubuntu amd64
     runs-on: ubuntu-latest
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     steps:
       - name: setup
         run: |
@@ -592,7 +592,7 @@ jobs:
   cmake-ubuntu-arm64:
     name: cmake ubuntu arm64
     runs-on: ubuntu-24.04-arm
-    container: ubuntu:24.04
+    container: ubuntu:26.04
     steps:
       - name: setup
         run: |
diff --git a/Dockerfile b/Dockerfile
index cf5d5b8..804f2ac 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,7 +33,7 @@
 # <https://gamma.cs.unc.edu/AVO/>
 #
 
-FROM ubuntu:24.04
+FROM ubuntu:26.04
 ARG TARGETARCH
 LABEL org.opencontainers.image.authors="Jur van den Berg, Jamie Snape, Stephen J. Guy, and Dinesh Manocha"
 LABEL org.opencontainers.image.base.name="docker.io/library/ubuntu:latest"