diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45a9071..0fc359f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,7 +11,7 @@ Pre-v1.0.0 tags followed the pi npm version (`v{pi_version}[letter]`).
 
 ---
 
-## Unreleased
+## v1.9.3 — 2026-09-19
 
 ### Dependency audit (2026-09-19)
 
diff --git a/Dockerfile.base b/Dockerfile.base
index 706d08a..87f19ed 100644
--- a/Dockerfile.base
+++ b/Dockerfile.base
@@ -14,7 +14,7 @@
 # content-addressed over this file, so any byte change invalidates the
 # cache. Recommended cadence: once per release for security updates.
 #
-# BASE_REBUILD_DATE: 2026-07-13 (Unreleased — agent-browser CLI + Playwright Chromium for headless browser automation; prior: typst PDF engine + xz-utils + pandoc typst-template default-font patch)
+# BASE_REBUILD_DATE: 2026-09-19 (v1.9.3 — mempalace-version label, mempalace-toolkit 817b3a8 mine deadline, pi-extensions skill floor 25c1265; the marker had been stale since 2026-07-13 through the v1.9.0 Node 24 and v1.9.2 npm-residue rebuilds, updated now because the base is rebuilding anyway)
 #
 # ── Lineage note ─────────────────────────────────────────────────────
 # Adapted from opencode-devbox/Dockerfile.base (commit before v1.16.2).