diff --git a/base/Dockerfile b/base/Dockerfile
index 93ec1f38..24ddde25 100644
--- a/base/Dockerfile
+++ b/base/Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_IMAGE=ubuntu:24.04
+ARG BASE_IMAGE=ubuntu:26.04
 FROM $BASE_IMAGE
 
 LABEL maintainer="InseeFrLab <innovation@insee.fr>"
diff --git a/versions.env b/versions.env
index 2f9ef6ca..e4c59803 100644
--- a/versions.env
+++ b/versions.env
@@ -2,7 +2,7 @@
 # (utils/generate_matrix.py) and by local build scripts (utils/build_chains.sh, utils/build_chain.py).
 # Updated by Renovate, which also keeps the ARG defaults of the Dockerfiles in sync.
 
-BASE_IMAGE_CPU="ubuntu:24.04"
+BASE_IMAGE_CPU="ubuntu:26.04"
 BASE_IMAGE_GPU="nvidia/cuda:13.2.1-cudnn-runtime-ubuntu24.04"
 
 PYTHON_VERSION_1="3.14.7"