diff --git a/ci/test/00_setup_env_freebsd_cross.sh b/ci/test/00_setup_env_freebsd_cross.sh
index da7304d1d26..1be28a22c64 100755
--- a/ci/test/00_setup_env_freebsd_cross.sh
+++ b/ci/test/00_setup_env_freebsd_cross.sh
@@ -7,7 +7,7 @@
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_freebsd_cross
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export APT_LLVM_V="22"
 export FREEBSD_VERSION=15.0
 export PACKAGES="clang-${APT_LLVM_V} llvm-${APT_LLVM_V} lld"
diff --git a/ci/test/00_setup_env_native_fuzz.sh b/ci/test/00_setup_env_native_fuzz.sh
index cdfe2a0d35b..276ce08d056 100755
--- a/ci/test/00_setup_env_native_fuzz.sh
+++ b/ci/test/00_setup_env_native_fuzz.sh
@@ -6,7 +6,7 @@
 
 export LC_ALL=C.UTF-8
 
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export CONTAINER_NAME=ci_native_fuzz
 export APT_LLVM_V="22"
 export PACKAGES="clang-${APT_LLVM_V} llvm-${APT_LLVM_V} libclang-rt-${APT_LLVM_V}-dev libevent-dev libboost-dev libsqlite3-dev libcapnp-dev capnproto"
diff --git a/ci/test/00_setup_env_native_fuzz_with_msan.sh b/ci/test/00_setup_env_native_fuzz_with_msan.sh
index 82d9044a8d7..c35a93622df 100755
--- a/ci/test/00_setup_env_native_fuzz_with_msan.sh
+++ b/ci/test/00_setup_env_native_fuzz_with_msan.sh
@@ -6,7 +6,7 @@
 
 export LC_ALL=C.UTF-8
 
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export APT_LLVM_V="22"
 LIBCXX_DIR="/cxx_build/"
 export MSAN_FLAGS="-fsanitize=memory -fsanitize-memory-track-origins=2 -fno-omit-frame-pointer -g -O1 -fno-optimize-sibling-calls"
diff --git a/ci/test/00_setup_env_native_iwyu.sh b/ci/test/00_setup_env_native_iwyu.sh
index 27b1e02b6db..3a26be56e7e 100755
--- a/ci/test/00_setup_env_native_iwyu.sh
+++ b/ci/test/00_setup_env_native_iwyu.sh
@@ -6,7 +6,7 @@
 
 export LC_ALL=C.UTF-8
 
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/debian:trixie"  # To build codegen, CMake must be 3.31 or newer.
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"  # To build codegen, CMake must be 3.31 or newer.
 export CONTAINER_NAME=ci_native_iwyu
 export IWYU_LLVM_V="22"
 export APT_LLVM_V="${IWYU_LLVM_V}"
diff --git a/ci/test/00_setup_env_native_msan.sh b/ci/test/00_setup_env_native_msan.sh
index 4a10bf96eab..1d005abbd60 100755
--- a/ci/test/00_setup_env_native_msan.sh
+++ b/ci/test/00_setup_env_native_msan.sh
@@ -6,7 +6,7 @@
 
 export LC_ALL=C.UTF-8
 
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export APT_LLVM_V="22"
 LIBCXX_DIR="/cxx_build/"
 export MSAN_FLAGS="-fsanitize=memory -fsanitize-memory-track-origins=2 -fno-omit-frame-pointer -g -O1 -fno-optimize-sibling-calls"
diff --git a/ci/test/00_setup_env_native_tidy.sh b/ci/test/00_setup_env_native_tidy.sh
index b3cda17e8ee..5cebb8cd8ca 100755
--- a/ci/test/00_setup_env_native_tidy.sh
+++ b/ci/test/00_setup_env_native_tidy.sh
@@ -6,7 +6,7 @@
 
 export LC_ALL=C.UTF-8
 
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export CONTAINER_NAME=ci_native_tidy
 export TIDY_LLVM_V="22"
 export APT_LLVM_V="${TIDY_LLVM_V}"