diff --git a/Gemfile.lock b/Gemfile.lock
index 580333f6e6d382b56715571649104cbe220fa567..8eeacc58a492c221e7f40b35a90ca47d3d68158c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,58 +26,58 @@ GIT
 PATH
   remote: .
   specs:
-    actioncable (5.1.0.beta1)
-      actionpack (= 5.1.0.beta1)
+    actioncable (5.1.0.rc1)
+      actionpack (= 5.1.0.rc1)
       nio4r (~> 2.0)
       websocket-driver (~> 0.6.1)
-    actionmailer (5.1.0.beta1)
-      actionpack (= 5.1.0.beta1)
-      actionview (= 5.1.0.beta1)
-      activejob (= 5.1.0.beta1)
+    actionmailer (5.1.0.rc1)
+      actionpack (= 5.1.0.rc1)
+      actionview (= 5.1.0.rc1)
+      activejob (= 5.1.0.rc1)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.1.0.beta1)
-      actionview (= 5.1.0.beta1)
-      activesupport (= 5.1.0.beta1)
+    actionpack (5.1.0.rc1)
+      actionview (= 5.1.0.rc1)
+      activesupport (= 5.1.0.rc1)
       rack (~> 2.0)
       rack-test (~> 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.0.beta1)
-      activesupport (= 5.1.0.beta1)
+    actionview (5.1.0.rc1)
+      activesupport (= 5.1.0.rc1)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.1.0.beta1)
-      activesupport (= 5.1.0.beta1)
+    activejob (5.1.0.rc1)
+      activesupport (= 5.1.0.rc1)
       globalid (>= 0.3.6)
-    activemodel (5.1.0.beta1)
-      activesupport (= 5.1.0.beta1)
-    activerecord (5.1.0.beta1)
-      activemodel (= 5.1.0.beta1)
-      activesupport (= 5.1.0.beta1)
+    activemodel (5.1.0.rc1)
+      activesupport (= 5.1.0.rc1)
+    activerecord (5.1.0.rc1)
+      activemodel (= 5.1.0.rc1)
+      activesupport (= 5.1.0.rc1)
       arel (~> 8.0)
-    activesupport (5.1.0.beta1)
+    activesupport (5.1.0.rc1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    rails (5.1.0.beta1)
-      actioncable (= 5.1.0.beta1)
-      actionmailer (= 5.1.0.beta1)
-      actionpack (= 5.1.0.beta1)
-      actionview (= 5.1.0.beta1)
-      activejob (= 5.1.0.beta1)
-      activemodel (= 5.1.0.beta1)
-      activerecord (= 5.1.0.beta1)
-      activesupport (= 5.1.0.beta1)
+    rails (5.1.0.rc1)
+      actioncable (= 5.1.0.rc1)
+      actionmailer (= 5.1.0.rc1)
+      actionpack (= 5.1.0.rc1)
+      actionview (= 5.1.0.rc1)
+      activejob (= 5.1.0.rc1)
+      activemodel (= 5.1.0.rc1)
+      activerecord (= 5.1.0.rc1)
+      activesupport (= 5.1.0.rc1)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 5.1.0.beta1)
+      railties (= 5.1.0.rc1)
       sprockets-rails (>= 2.0.0)
-    railties (5.1.0.beta1)
-      actionpack (= 5.1.0.beta1)
-      activesupport (= 5.1.0.beta1)
+    railties (5.1.0.rc1)
+      actionpack (= 5.1.0.rc1)
+      activesupport (= 5.1.0.rc1)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
@@ -159,7 +159,7 @@ GEM
       http_parser.rb (>= 0.6.0)
     em-socksify (0.3.1)
       eventmachine (>= 1.0.0.beta.4)
-    erubi (1.4.0)
+    erubi (1.6.0)
     erubis (2.7.0)
     event_emitter (0.2.5)
     eventmachine (1.2.1)
diff --git a/RAILS_VERSION b/RAILS_VERSION
index d5d15fa148d85ffaad2c8a3cc2dea1965bad6c6e..09b65f3fadb04923cc88993c0837ae75d0cc5399 100644
--- a/RAILS_VERSION
+++ b/RAILS_VERSION
@@ -1 +1 @@
-5.1.0.beta1
+5.1.0.rc1
diff --git a/actioncable/CHANGELOG.md b/actioncable/CHANGELOG.md
index a0254fe32361541bd1cfb1d88c3c6174f953dcd9..1d39d9fb7fa074de8de0d895ee8eeee675ddeea4 100644
--- a/actioncable/CHANGELOG.md
+++ b/actioncable/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.1.0.beta1 (February 23, 2017) ##
 
 *   Redis subscription adapters now support `channel_prefix` option in `cable.yml`
diff --git a/actioncable/lib/action_cable/gem_version.rb b/actioncable/lib/action_cable/gem_version.rb
index c09613a74709aff1193b557de376866f91c8918b..606bf2dd27efad8dd39b013bef6decf441996025 100644
--- a/actioncable/lib/action_cable/gem_version.rb
+++ b/actioncable/lib/action_cable/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actioncable/package.json b/actioncable/package.json
index 69ae3519d966a833a96dee6887f58f2adf00dc54..8d6c310aa8a4579a2e77736baeb8cfb2d99e9f66 100644
--- a/actioncable/package.json
+++ b/actioncable/package.json
@@ -1,6 +1,6 @@
 {
   "name": "actioncable",
-  "version": "5.1.0-beta1",
+  "version": "5.1.0-rc1",
   "description": "WebSocket framework for Ruby on Rails.",
   "main": "lib/assets/compiled/action_cable.js",
   "files": [
diff --git a/actionmailer/CHANGELOG.md b/actionmailer/CHANGELOG.md
index ee33450b4567412d88a3a0a5a4f9f0eb1f62b8e8..3883ab4bbd590ab64d4c5605ae0754834d2b95e3 100644
--- a/actionmailer/CHANGELOG.md
+++ b/actionmailer/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.1.0.beta1 (February 23, 2017) ##
 
 *   Add `:args` to `process.action_mailer` event.
diff --git a/actionmailer/lib/action_mailer/gem_version.rb b/actionmailer/lib/action_mailer/gem_version.rb
index de2d71bd3ec9e1968dd5cf61a2e4c10f188d78c5..5a2c61a9a9163ff4aa4ed408cae2f2fbf38a284e 100644
--- a/actionmailer/lib/action_mailer/gem_version.rb
+++ b/actionmailer/lib/action_mailer/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index d0662bdae2bf49a453a1c4b991fb17d0408896cf..0f46a2d728986627b07c437bc21a54dcaf20f86a 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
 *   Fix `NameError` raised in `ActionController::Renderer#with_defaults`
 
     *Hiroyuki Ishii*
diff --git a/actionpack/lib/action_pack/gem_version.rb b/actionpack/lib/action_pack/gem_version.rb
index d6a91a0569479ad5a35438dcf7ba52ce6826135e..f769c66099619c0fe839b2eb0c4c5d05a77609ea 100644
--- a/actionpack/lib/action_pack/gem_version.rb
+++ b/actionpack/lib/action_pack/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actionview/CHANGELOG.md b/actionview/CHANGELOG.md
index 6e718093854470684efe91c97194ef36abddf5e2..198718c55f4cb55ce53719146a5f98ff436aee6d 100644
--- a/actionview/CHANGELOG.md
+++ b/actionview/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
 *   Remove the option `encode_special_chars` misnomer from `strip_tags`
 
     As of rails-html-sanitizer v1.0.3, the sanitizer will ignore the
diff --git a/actionview/lib/action_view/gem_version.rb b/actionview/lib/action_view/gem_version.rb
index 662a85f19154938fba6d5c610f84f4d43ba74a55..f566fd4718ef549e0db89fc04885c35bc0f2c089 100644
--- a/actionview/lib/action_view/gem_version.rb
+++ b/actionview/lib/action_view/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/actionview/package.json b/actionview/package.json
index a1da13315e5b9474785f7582434a8f7bb59ee538..a6a0d428712e3670155a5d47a6ef6ad71e140113 100644
--- a/actionview/package.json
+++ b/actionview/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rails-ujs",
-  "version": "5.1.0-beta1",
+  "version": "5.1.0-rc1",
   "description": "Ruby on Rails unobtrusive scripting adapter",
   "main": "lib/assets/compiled/rails-ujs.js",
   "files": [
diff --git a/activejob/CHANGELOG.md b/activejob/CHANGELOG.md
index 41505fbf832f403ca5b4f237193a8a46e5777ba2..7675c45792b3dfd8504a632044841c129724c504 100644
--- a/activejob/CHANGELOG.md
+++ b/activejob/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.1.0.beta1 (February 23, 2017) ##
 
 *   Correctly set test adapter when configure the queue adapter on a per job.
diff --git a/activejob/lib/active_job/gem_version.rb b/activejob/lib/active_job/gem_version.rb
index 2b608b9a65c4b1ce00c1b1d8e7311ba3f2a68d23..39af441e9a6d5954d017dc5d426c873ce7ba8937 100644
--- a/activejob/lib/active_job/gem_version.rb
+++ b/activejob/lib/active_job/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index 1503b6a3e4fb07be1bd5252778eb743641672caa..50b55f0f08ca4f7301b0b81801662673892acf9e 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.1.0.beta1 (February 23, 2017) ##
 
 *   Remove deprecated behavior that halts callbacks when the return is false.
diff --git a/activemodel/lib/active_model/gem_version.rb b/activemodel/lib/active_model/gem_version.rb
index 6a2ab2a8e5cae0f9eebfa6f4896639f90696db18..f5e4f4220817c96f5fd24b1351f5a4e2338d0d6c 100644
--- a/activemodel/lib/active_model/gem_version.rb
+++ b/activemodel/lib/active_model/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 4488524c4e4aff93847b11c11256ef92d7ace2db..cc1d686090d95e0bfddb2448a3ad90a769f8d15b 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
 *   Remove comments from structure.sql when using postgresql adapter to avoid
     version-specific parts of the file.
 
diff --git a/activerecord/lib/active_record/gem_version.rb b/activerecord/lib/active_record/gem_version.rb
index 174f71615256483db93f898526b9e7accb5a7aac..9bff5cdec83087e4b3a7b43981bffaf8689de39d 100644
--- a/activerecord/lib/active_record/gem_version.rb
+++ b/activerecord/lib/active_record/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index d12cbc34dd4bc0c0595646e1a913d50feb9f2492..96dab0a515d17328015a0cfe807fdb4486a2c020 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
 *   Fixed bug in `DateAndTime::Compatibility#to_time` that caused it to
     raise `RuntimeError: can't modify frozen Time` when called on any frozen `Time`.
     Properly pass through the frozen `Time` or `ActiveSupport::TimeWithZone` object
diff --git a/activesupport/lib/active_support/gem_version.rb b/activesupport/lib/active_support/gem_version.rb
index a641b96c57ca99157ac553c5e15f9385e0fc7cee..efbb2eb1d13362de38dd5208a50faa47f9058aa7 100644
--- a/activesupport/lib/active_support/gem_version.rb
+++ b/activesupport/lib/active_support/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/guides/CHANGELOG.md b/guides/CHANGELOG.md
index 3a602efb3dd77a7cadeb9843c7a5a0a749f8ce68..aebe857bcafe623a4eb0f64ea084d4275f17ae8e 100644
--- a/guides/CHANGELOG.md
+++ b/guides/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
+*   No changes.
+
+
 ## Rails 5.1.0.beta1 (February 23, 2017) ##
 
 *   No changes.
diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index f4d3529a374b2bfee558b5b7c97ecdb48fd2c70c..bf3e5aee2d29ebfa2113c5fb11c84ddd5b738bcc 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,3 +1,5 @@
+## Rails 5.1.0.rc1 (March 20, 2017) ##
+
 *   Add `app:update` task to engines.
 
     *Yuji Yaginuma*
diff --git a/railties/lib/rails/gem_version.rb b/railties/lib/rails/gem_version.rb
index 3174ffb0dca4a4704091f1328a8e3a108ae37540..6d9305794761fdcd6120d18db561847d8ca4552b 100644
--- a/railties/lib/rails/gem_version.rb
+++ b/railties/lib/rails/gem_version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end
diff --git a/version.rb b/version.rb
index 3174ffb0dca4a4704091f1328a8e3a108ae37540..6d9305794761fdcd6120d18db561847d8ca4552b 100644
--- a/version.rb
+++ b/version.rb
@@ -8,7 +8,7 @@ module VERSION
     MAJOR = 5
     MINOR = 1
     TINY  = 0
-    PRE   = "beta1"
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")
   end