PDFBOX-3330: upgrade to various plugins
diff --git a/package.json b/package.json
index 34af820..cb8651b 100644
--- a/package.json
+++ b/package.json
@@ -17,13 +17,13 @@
     "checks": "run-s check:*"
   },
   "devDependencies": {
-    "@11ty/eleventy": "^0.11.0",
-    "@11ty/eleventy-cache-assets": "^2.0.3",
+    "@11ty/eleventy": "^0.12.0",
+    "@11ty/eleventy-cache-assets": "^2.1.0",
     "@11ty/eleventy-plugin-syntaxhighlight": "^3.0.1",
-    "html-validate": "^2.23.0",
-    "markdown-it-anchor": "^5.3.0",
+    "html-validate": "^4.7.0",
+    "markdown-it-anchor": "^7.1.0",
     "npm-run-all": "^4.1.5",
-    "sass": "^1.26.8"
+    "sass": "^1.32.0"
   },
   "dependencies": {
     "eleventy-plugin-nesting-toc": "^1.2.0"