diff --git a/dev-ruby/actionpack/Manifest b/dev-ruby/actionpack/Manifest
index a89a6cba1d3cc..c30c024b33677 100644
--- a/dev-ruby/actionpack/Manifest
+++ b/dev-ruby/actionpack/Manifest
@@ -7,3 +7,4 @@ DIST rails-5.0.2.tgz 6034813 SHA256 4ca4ab89c06776f959edde03833f83be05002db5a102
 DIST rails-5.0.3.tgz 6041420 SHA256 0c16f63af96529c1e3d2b4476031bd024ae403322fe78e80e188a422412dc582 SHA512 5a25747507d2a8e1d2a19ce14c77a80c4f9bd5751fb343c3f405b8d9ec170d11fb866ebfedf6b850b6750399015631ab1551e6f78e097c6514061462a05e88f3 WHIRLPOOL 25fd8473a4eed2f007b99e22cb7ccf834780d4f21478a0818c44bea525f4c839610bab2b52ae5087a881f8d5519b78616f4e53e6a21f7d6f9270c0ddf648a2a5
 DIST rails-5.0.4.tgz 6041948 SHA256 50f64f8c1d083d22a652ce4d594b38674a502b89ed7b913ebb9f1dce6984a32e SHA512 9a99d506606f2901f8b4afcfa8cc92e7d122b0879c619a539aee52df5b8926e6dca98e0eb14234f810b8a73730c3c051985e13ab0bab5f52cd8c11a0b112c44d WHIRLPOOL 842f3dfd691c7904804be128e4acf555076b96e5dbb8d874918a6492991f67c31faf8d4a5410969eadcef1166035f64c1fed6e8ae4f9f2b808600ea729a15808
 DIST rails-5.1.1.tgz 6124695 SHA256 a09bfa7d2917865778af70dff8bd57fe01820eca0228cff85de581ee17e9adf2 SHA512 fd62506eac440f1ad9b37f20c7c712733440bc2ee676390c02e3bd50b912fe0fd53e8092c23664d47818ee62583568c6e20d2bfd5eff6d22a005289bb3bb258f WHIRLPOOL a23d6644126e6e01481c48c7089208a535188b5b32ad67cb69db36ac2044ee35bd95d4012076d7f12666aed2cbe984c75c3555889923710f10b1b91c150ccc73
+DIST rails-5.1.2.tgz 6124489 SHA256 cd6173b2ca492397d1cf22190a3070f1af485c2e25f7d9b3c2d0a80f553b4aae SHA512 95072d06ce19726343758f4dbdac96728598e31be0a0560f240511bf043aab47d55530ef47bd9b390aa61b5e0ad6e142781ed7167ce7f2cf11d22a71127d7872 WHIRLPOOL ba3d0e231f4307343c6c955ecc273ac2e507d503f58a859ea81addd945bd8007190d45f18afbf3ec6915872af324a27dd2377927efe5e6c857e2ca09b6549fce
diff --git a/dev-ruby/actionpack/actionpack-5.1.2.ebuild b/dev-ruby/actionpack/actionpack-5.1.2.ebuild
new file mode 100644
index 0000000000000..fe2914cdbd295
--- /dev/null
+++ b/dev-ruby/actionpack/actionpack-5.1.2.ebuild
@@ -0,0 +1,65 @@
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+USE_RUBY="ruby22 ruby23 ruby24"
+
+RUBY_FAKEGEM_TASK_DOC=""
+RUBY_FAKEGEM_DOCDIR="doc"
+RUBY_FAKEGEM_EXTRADOC="CHANGELOG.md README.rdoc"
+
+RUBY_FAKEGEM_GEMSPEC="actionpack.gemspec"
+
+RUBY_FAKEGEM_BINWRAP=""
+
+inherit ruby-fakegem versionator
+
+DESCRIPTION="Eases web-request routing, handling, and response"
+HOMEPAGE="https://github.com/rails/rails"
+SRC_URI="https://github.com/rails/rails/archive/v${PV}.tar.gz -> rails-${PV}.tgz"
+
+LICENSE="MIT"
+SLOT="$(get_version_component_range 1-2)"
+KEYWORDS="~amd64 ~amd64-linux"
+IUSE=""
+
+RUBY_S="rails-${PV}/${PN}"
+
+ruby_add_rdepend "
+	~dev-ruby/activesupport-${PV}
+	~dev-ruby/actionview-${PV}
+	dev-ruby/rack:2.0
+	>=dev-ruby/rack-test-0.6.3:0.6
+	>=dev-ruby/rails-html-sanitizer-1.0.2:1
+	dev-ruby/rails-dom-testing:2
+"
+
+ruby_add_bdepend "
+	test? (
+		dev-ruby/mocha:0.14
+		dev-ruby/bundler
+		>=dev-ruby/capybara-2.13:2
+		~dev-ruby/activemodel-${PV}
+		>=dev-ruby/rack-cache-1.2:1.2
+		www-servers/puma
+	)"
+
+all_ruby_prepare() {
+	# Remove items from the common Gemfile that we don't need for this
+	# test run. This also requires handling some gemspecs.
+	sed -i -e "/\(system_timer\|sdoc\|w3c_validators\|pg\|execjs\|jquery-rails\|'mysql'\|journey\|ruby-prof\|stackprof\|benchmark-ips\|kindlerb\|turbolinks\|coffee-rails\|debugger\|sprockets-rails\|redcarpet\|bcrypt\|uglifier\|sprockets\|stackprof\)/ s:^:#:" \
+		-e '/:job/,/end/ s:^:#:' \
+		-e '/group :doc/,/^end/ s:^:#:' ../Gemfile || die
+	rm ../Gemfile.lock || die
+
+	# Skip a failing test related to security updates in 4.2.5.1. Let's
+	# assume that this is not a bug but a test lagging a security
+	# measure.
+	sed -i -e '/test_dynamic_render_with_file/,/^  end/ s:^:#:' \
+		test/controller/render_test.rb || die
+
+	# Skip brittle test depending on mime type registration order (fixed upstream)
+	sed -i -e '/parse application with trailing star/,/^  end/ s:^:#:' \
+		test/dispatch/mime_type_test.rb
+}