diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index c62af0b4f..ed0df5de7 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -6,6 +6,23 @@ The format follows [Keep a Changelog](https://keepachangelog.com/), and this pro
 
 ---
 
+## [6.7.0] - 2026-02-10
+
+### Added
+
+- **Display math validation** — pure ZSH state machine (`_check_math_blanks`) detects blank lines and unclosed `$$` blocks in `.qmd` files (PR #368)
+- **Pre-commit gate** — lint-staged validates `.qmd` files at commit time via `scripts/check-math.zsh`
+- **Deploy preflight: math check** — display math validation runs as check 3 of 5 during `teach deploy`; CI mode blocks, interactive warns
+- **Quality Gates documentation** — new `docs/guides/QUALITY-GATES.md` mapping every validation layer from keystroke to production
+- **41 new test assertions** across 3 suites (unit, E2E with sandboxed repos, dogfood against demo course)
+
+### Changed
+
+- Deploy preflight checks renumbered: unpushed commits → check 4, production conflicts → check 5
+- Test suite: 42/42 passing (143 test files, up from 140)
+
+---
+
 ## [6.6.0] - 2026-02-09
 
 ### Added
diff --git a/docs/guides/QUALITY-GATES.md b/docs/guides/QUALITY-GATES.md
index ae3bb27f9..ba0cb283b 100644
--- a/docs/guides/QUALITY-GATES.md
+++ b/docs/guides/QUALITY-GATES.md
@@ -247,4 +247,4 @@ Areas where validation could be added in the future:
 ---
 
 **Last Updated:** 2026-02-10
-**Version:** v6.6.0
+**Version:** v6.7.0
diff --git a/docs/guides/TEACH-DEPLOY-GUIDE.md b/docs/guides/TEACH-DEPLOY-GUIDE.md
index 440803788..a3633b9b8 100644
--- a/docs/guides/TEACH-DEPLOY-GUIDE.md
+++ b/docs/guides/TEACH-DEPLOY-GUIDE.md
@@ -1224,5 +1224,5 @@ The deployment summary box now includes a direct link to your GitHub Actions pag
 
 ---
 
-**Last Updated:** 2026-02-09
-**Version:** v6.6.0
+**Last Updated:** 2026-02-10
+**Version:** v6.7.0
diff --git a/docs/reference/REFCARD-DEPLOY-V2.md b/docs/reference/REFCARD-DEPLOY-V2.md
index 2ea1c4bd4..84485208c 100644
--- a/docs/reference/REFCARD-DEPLOY-V2.md
+++ b/docs/reference/REFCARD-DEPLOY-V2.md
@@ -303,4 +303,4 @@ teach deploy --ci -d -m "Auto-deploy from GitHub Actions"
 
 ---
 
-*v6.6.0 - teach deploy v2 with safety enhancements*
+*v6.7.0 - teach deploy v2 with math preflight + quality gates*
diff --git a/docs/reference/REFCARD-TEACH-DISPATCHER.md b/docs/reference/REFCARD-TEACH-DISPATCHER.md
index 2495e14a6..edb169192 100644
--- a/docs/reference/REFCARD-TEACH-DISPATCHER.md
+++ b/docs/reference/REFCARD-TEACH-DISPATCHER.md
@@ -449,6 +449,6 @@ teach status --performance        # Review metrics
 
 ---
 
-**Version:** v6.6.0
-**Last Updated:** 2026-02-08
+**Version:** v6.7.0
+**Last Updated:** 2026-02-10
 **Commands:** 30 total (9 Scholar wrappers + 5 course mgmt + 6 content mgmt + 9 infrastructure + 1 discovery)