diff --git a/.depcheckrc.json b/.depcheckrc.json
index 89ba088081ef23f5f604ffaabd021a6d285da5c6..265fde2d341c96e2c77c849d36fce8c4e6c5073f 100644
--- a/.depcheckrc.json
+++ b/.depcheckrc.json
@@ -1,4 +1,5 @@
 {
   "ignore-bin-package": true,
+  "ignore-dirs": ["public"],
   "ignores": ["highlight.js", "reveal.js", "esm"]
 }
diff --git a/package.json b/package.json
index c2e35ac2ef38c68f14dcc21560a68e2856f07e9b..ed77640499f40fd95f682435225efd47ce18c922 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "reveal.js": "^3.9.2",
     "rollup": "^2.8.2",
     "through2": "^3.0.1",
+    "vinyl": "^2.2.0",
     "vinyl-sourcemaps-apply": "^0.2.1"
   },
   "devDependencies": {