diff --git a/crates/cognitive-stack/Dockerfile b/crates/cognitive-stack/Dockerfile
index 06a96a4c4..7d48a3a3a 100644
--- a/crates/cognitive-stack/Dockerfile
+++ b/crates/cognitive-stack/Dockerfile
@@ -18,10 +18,11 @@
 # AUTH: a Railway server has access to all private AdaWorldAPI repos by design;
 # CARGO_NET_GIT_FETCH_WITH_CLI=true makes cargo use the system git (ambient creds).
 
-ARG ADA_BRANCH=claude/jirak-math-theorems-harvest-rfii13
+# ndarray branch to clone: master, the default every other build and CI job uses.
+ARG ADA_BRANCH=master
 
 # ── builder ──────────────────────────────────────────────────────────────────
-FROM rust:1.98.1-bookworm AS builder
+FROM rust:1.99.0-bookworm AS builder
 ARG ADA_BRANCH
 ENV CARGO_NET_GIT_FETCH_WITH_CLI=true
 # Native build deps for the closure: aws-lc-sys (C++), zstd/lz4 (C), and protoc
diff --git a/crates/symbiont/Dockerfile b/crates/symbiont/Dockerfile
index be728ca1a..8155b0b4d 100644
--- a/crates/symbiont/Dockerfile
+++ b/crates/symbiont/Dockerfile
@@ -18,10 +18,11 @@
 # the SYSTEM git (which honors Railway's ambient credentials) rather than its
 # built-in libgit2 transport — done via CARGO_NET_GIT_FETCH_WITH_CLI=true below.
 
-ARG ADA_BRANCH=claude/jirak-math-theorems-harvest-rfii13
+# ndarray branch to clone: master, the default every other build and CI job uses.
+ARG ADA_BRANCH=master
 
 # ── builder ──────────────────────────────────────────────────────────────────
-FROM rust:1.98.1-bookworm AS builder
+FROM rust:1.99.0-bookworm AS builder
 ARG ADA_BRANCH
 # Make cargo fetch git deps via the system `git` CLI so it uses Railway's
 # ambient credentials for the private AdaWorldAPI forks.