diff --git a/ruby-oj/PKGBUILD b/ruby-oj/PKGBUILD
index a69a77c..9e9284e 100644
--- a/ruby-oj/PKGBUILD
+++ b/ruby-oj/PKGBUILD
@@ -2,40 +2,45 @@
 
 _gemname=oj
 pkgname=ruby-$_gemname
-pkgver=3.13.0
+pkgver=3.13.1
 pkgrel=1
 pkgdesc='The fastest JSON parser and object serializer'
 arch=('x86_64')
 url='https://github.com/ohler55/oj'
 license=('MIT')
 depends=('ruby')
+makedepends=('ruby-rdoc')
 options=(!emptydirs)
 source=("https://rubygems.org/downloads/$_gemname-$pkgver.gem")
 noextract=("$_gemname-$pkgver.gem")
-b2sums=('483e89e7027cf3d096de78c07432adf5d3c341d87a69e7d1335ce8012aa8b68c51e8fd6dcead177134b5fbc203f81cfbc9c7583795221e30b37934ef6cbb4d83')
+b2sums=('a77d194ab66a93abb6a9606c4b1697e4382dd1d7f4d1f59dedb370971c760feba221d6d881ce933632d98f63696695ae290f0709e78b36459c1c8cbf43b74242')
 
 package() {
   local _gemdir="$(ruby -e'puts Gem.default_dir')"
 
   gem install \
+    --verbose \
     --ignore-dependencies \
     --no-user-install \
-    --no-document \
     --install-dir "$pkgdir/$_gemdir" \
     --bindir "$pkgdir/usr/bin" \
     "$_gemname-$pkgver.gem"
 
   # delete cache
   cd "$pkgdir/$_gemdir"
-  rm -rf cache
+  rm -vrf cache
 
+  # delete unnecessary files & folders
+  # TODO: investigate gem.build_complete (gem_build_complete_path)
+  rm -vrf "extensions/$(uname -m)-linux/$(basename $(ruby -e'puts Gem.default_dir'))/$_gemname-$pkgver/gem_make.out"
   cd "gems/$_gemname-$pkgver"
-  # delete unnecessary folders
-  rm -rf test ext
+  rm -vrf test ext
+
   # move documentation
   install -vd "$pkgdir/usr/share/doc/$pkgname"
-  mv README.md pages "$pkgdir/usr/share/doc/$pkgname"
+  mv -v README.md pages "$pkgdir/usr/share/doc/$pkgname"
+
   # license
   install -vd "$pkgdir/usr/share/licenses/$pkgname"
-  mv LICENSE "$pkgdir/usr/share/licenses/$pkgname"
+  mv -v LICENSE "$pkgdir/usr/share/licenses/$pkgname"
 }