diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index 14ff439..a40142f 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -1,7 +1,7 @@
 {
   "name": "diagram-design",
   "description": "Create branded architecture, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, loop/flywheel, nested, tree, org chart, layer stack, Venn, pyramid/funnel, bar, line, Gantt and scatter charts, high-level, process, medallion, data flow, DP integration, or DP security matrix diagrams as standalone HTML/SVG/PNG. Redraw .drawio/.drawio.png/.drawio.svg or Mermaid .mmd sources at a chosen size/detail; onboard brand tokens from a website; add semantic patterns, callouts, accessible motion, or sketchy/hand-drawn styling.",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "author": {
     "name": "Cathryn Lavery",
     "url": "https://github.com/cathrynlavery"
diff --git a/.codex-plugin/plugin.json b/.codex-plugin/plugin.json
index d3c0828..afdeaa5 100644
--- a/.codex-plugin/plugin.json
+++ b/.codex-plugin/plugin.json
@@ -1,7 +1,7 @@
 {
   "name": "diagram-design",
   "description": "Create branded architecture, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, loop/flywheel, nested, tree, org chart, layer stack, Venn, pyramid/funnel, bar, line, Gantt and scatter charts, high-level, process, medallion, data flow, DP integration, or DP security matrix diagrams as standalone HTML/SVG/PNG. Redraw .drawio/.drawio.png/.drawio.svg or Mermaid .mmd sources at a chosen size/detail; onboard brand tokens from a website; add semantic patterns, callouts, accessible motion, or sketchy/hand-drawn styling.",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "author": {
     "name": "Cathryn Lavery",
     "url": "https://github.com/cathrynlavery"
diff --git a/scripts/lint-skin.py b/scripts/lint-skin.py
index 0911fa9..874a90f 100644
--- a/scripts/lint-skin.py
+++ b/scripts/lint-skin.py
@@ -53,6 +53,10 @@ ALLOWED_FONTS = {
     "instrument serif",
     "geist",
     "geist mono",
+    "hiragino sans",
+    "noto sans jp",
+    "yu gothic",
+    "noto sans mono cjk jp",
     "system-ui",
     "sans-serif",
     "serif",
diff --git a/scripts/test-lint-a11y.py b/scripts/test-lint-a11y.py
index e85c523..45aa051 100644
--- a/scripts/test-lint-a11y.py
+++ b/scripts/test-lint-a11y.py
@@ -363,6 +363,49 @@ def main() -> int:
             "font-family: unsupported font family: Unapproved Sans",
             directory,
         )
+        cjk_name_svg = VALID_SVG.replace("fixture-title", "cjk-name-stack-title").replace(
+            "fixture-desc", "cjk-name-stack-desc"
+        )
+        require_pass(
+            "cjk-name-stack",
+            cjk_name_svg.replace(
+                "</svg>",
+                '<text font-family="\'Geist\', \'Hiragino Sans\', \'Noto Sans JP\', '
+                '\'Yu Gothic\', sans-serif">認証サービス</text>\n</svg>',
+            ),
+            directory,
+        )
+        cjk_mono_svg = VALID_SVG.replace("fixture-title", "cjk-mono-stack-title").replace(
+            "fixture-desc", "cjk-mono-stack-desc"
+        )
+        require_pass(
+            "cjk-mono-stack",
+            cjk_mono_svg.replace(
+                "</svg>",
+                '<text font-family="\'Geist Mono\', \'Noto Sans Mono CJK JP\', '
+                'monospace">포트 443</text>\n</svg>',
+            ),
+            directory,
+        )
+        cjk_css_svg = VALID_SVG.replace("fixture-title", "cjk-css-stack-title").replace(
+            "fixture-desc", "cjk-css-stack-desc"
+        )
+        require_pass(
+            "cjk-css-stack",
+            '<style>text { font-family: "Geist", "Hiragino Sans", "Noto Sans JP", '
+            '"Yu Gothic", sans-serif; }</style>\n' + cjk_css_svg,
+            directory,
+        )
+        yu_gothic_ui_svg = VALID_SVG.replace(
+            "fixture-title", "yu-gothic-ui-title"
+        ).replace("fixture-desc", "yu-gothic-ui-desc")
+        require_lint_finding(
+            "yu-gothic-ui",
+            '<style>text { font-family: "Yu Gothic UI", sans-serif; }</style>\n'
+            + yu_gothic_ui_svg,
+            "font-family: unsupported font family: Yu Gothic UI",
+            directory,
+        )
 
         spec = importlib.util.spec_from_file_location("build_icons", BUILD_ICONS)
         if spec is None or spec.loader is None: