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-rw-r--r--src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile2
-rw-r--r--src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile2
-rw-r--r--src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile2
-rw-r--r--src/doc/unstable-book/src/compiler-flags/branch-protection.md1
4 files changed, 4 insertions, 3 deletions
diff --git a/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile b/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
index 71de8f917fa..04b46226acf 100644
--- a/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
+++ b/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:22.04
+FROM ubuntu:25.10
 
 ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && apt-get install -y --no-install-recommends \
diff --git a/src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile b/src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile
index adbb1f03378..095624d6fb7 100644
--- a/src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile
+++ b/src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:25.04
+FROM ubuntu:25.10
 
 ARG DEBIAN_FRONTEND=noninteractive
 
diff --git a/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile b/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
index e6133fce83e..4b61fd94a6c 100644
--- a/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
+++ b/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:22.04
+FROM ubuntu:25.10
 
 ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && apt-get install -y --no-install-recommends \
diff --git a/src/doc/unstable-book/src/compiler-flags/branch-protection.md b/src/doc/unstable-book/src/compiler-flags/branch-protection.md
index f0cc44a07f3..c15567dcac2 100644
--- a/src/doc/unstable-book/src/compiler-flags/branch-protection.md
+++ b/src/doc/unstable-book/src/compiler-flags/branch-protection.md
@@ -13,6 +13,7 @@ It takes some combination of the following values, separated by a `,`.
 - `leaf` - Enable pointer authentication for all functions, including leaf functions.
 - `b-key` - Sign return addresses with key B, instead of the default key A.
 - `bti` - Enable branch target identification.
+- `gcs` - Enable guarded control stack support.
 
 `leaf`, `b-key` and `pc` are only valid if `pac-ret` was previously specified.
 For example, `-Z branch-protection=bti,pac-ret,leaf` is valid, but