diff --git a/ci/test/00_setup_env_i686_no_ipc.sh b/ci/test/00_setup_env_i686_no_ipc.sh
index 93d5ab74460..2d2fe26bf35 100755
--- a/ci/test/00_setup_env_i686_no_ipc.sh
+++ b/ci/test/00_setup_env_i686_no_ipc.sh
@@ -8,7 +8,7 @@ export LC_ALL=C.UTF-8
 
 export HOST=i686-pc-linux-gnu
 export CONTAINER_NAME=ci_i686_no_multiprocess
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/debian:trixie"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export CI_IMAGE_PLATFORM="linux/amd64"
 export CI_CONTAINER_CAP="--security-opt seccomp=unconfined"
 export PACKAGES="llvm clang g++-multilib"
diff --git a/ci/test/00_setup_env_native_fuzz_with_valgrind.sh b/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
index ed84ae84cf3..8020ea43da7 100755
--- a/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
+++ b/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
@@ -6,7 +6,7 @@
 
 export LC_ALL=C.UTF-8
 
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/debian:trixie"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export CONTAINER_NAME=ci_native_fuzz_valgrind
 export PACKAGES="clang llvm libclang-rt-dev libevent-dev libboost-dev libsqlite3-dev valgrind libcapnp-dev capnproto"
 export NO_DEPENDS=1
diff --git a/ci/test/00_setup_env_native_valgrind.sh b/ci/test/00_setup_env_native_valgrind.sh
index 0ca02f77824..ba9d5b404aa 100755
--- a/ci/test/00_setup_env_native_valgrind.sh
+++ b/ci/test/00_setup_env_native_valgrind.sh
@@ -6,7 +6,7 @@
 
 export LC_ALL=C.UTF-8
 
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/debian:trixie"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export CONTAINER_NAME=ci_native_valgrind
 export PACKAGES="clang llvm libclang-rt-dev valgrind python3-zmq libevent-dev libboost-dev libzmq3-dev libsqlite3-dev libcapnp-dev capnproto python3-pip"
 export PIP_PACKAGES="--break-system-packages pycapnp"
diff --git a/ci/test/00_setup_env_s390x.sh b/ci/test/00_setup_env_s390x.sh
index d1e34070ca9..a7c59d76963 100755
--- a/ci/test/00_setup_env_s390x.sh
+++ b/ci/test/00_setup_env_s390x.sh
@@ -9,7 +9,7 @@ export LC_ALL=C.UTF-8
 export HOST=s390x-linux-gnu
 export PACKAGES="python3-zmq"
 export CONTAINER_NAME=ci_s390x
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/debian:trixie"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:26.04"
 export CI_IMAGE_PLATFORM="linux/s390x"
 # bind tests excluded for now, see https://github.com/bitcoin/bitcoin/issues/17765#issuecomment-602068547
 export TEST_RUNNER_EXTRA="--exclude rpc_bind --exclude feature_bind_extra"
diff --git a/test/sanitizer_suppressions/valgrind.supp b/test/sanitizer_suppressions/valgrind.supp
index 8bcad9140e3..27bbce8354e 100644
--- a/test/sanitizer_suppressions/valgrind.supp
+++ b/test/sanitizer_suppressions/valgrind.supp
@@ -12,7 +12,7 @@
 #       --error-limit=no build/bin/test_bitcoin
 #
 # Note that suppressions may depend on OS and/or library versions.
-# Tested on Debian Trixie system libs,
+# Tested on Ubuntu 26.04 system libs,
 # * using clang (only x86_64, see https://bugs.kde.org/show_bug.cgi?id=485276),
 # * and GCC (only -O1, see https://bugs.kde.org/show_bug.cgi?id=472329),
 # without gui (because it only passes with a DEBUG=1 depends build).