diff --git a/test/Dockerfile.client b/test/Dockerfile.client
index 63b0cc6..51be779 100644
--- a/test/Dockerfile.client
+++ b/test/Dockerfile.client
@@ -1,6 +1,6 @@
 # checkov:skip=CKV_DOCKER_2:Test container doesn't need healthcheck
 # checkov:skip=CKV_DOCKER_3:OpenVPN client requires root for NET_ADMIN
-FROM ubuntu:24.04
+FROM ubuntu:26.04
 
 ENV DEBIAN_FRONTEND=noninteractive
 
diff --git a/test/Dockerfile.server b/test/Dockerfile.server
index d7387d1..ccad1fa 100644
--- a/test/Dockerfile.server
+++ b/test/Dockerfile.server
@@ -1,7 +1,7 @@
 # checkov:skip=CKV_DOCKER_2:Test container doesn't need healthcheck
 # checkov:skip=CKV_DOCKER_3:OpenVPN server requires root for NET_ADMIN
 # checkov:skip=CKV_DOCKER_7:Base image is parameterized, some use latest tag
-ARG BASE_IMAGE=ubuntu:24.04
+ARG BASE_IMAGE=ubuntu:26.04
 FROM ${BASE_IMAGE}
 
 ARG BASE_IMAGE