diff --git a/.gitignore b/.gitignore
index 06cbdf8..721745e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 /.bundle/
 /.yardoc
-/Gemfile.lock
+Gemfile.lock
 /_yardoc/
 /coverage/
 /doc/
diff --git a/README.md b/README.md
index 01e2031..36c66ac 100644
--- a/README.md
+++ b/README.md
@@ -13,10 +13,6 @@ Sinja aims to be lightweight (to the extent that Sinatra is), ORM-agnostic (to
 the extent that JSONAPI::Serializers is), and opinionated (to the extent that
 the JSON:API specification is).
 
-**CAVEAT EMPTOR: This gem is still very new and under active development. The
-API is mostly stable, but there still may be significant breaking changes. It
-has not yet been thoroughly tested or vetted in a production environment.**
-
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
 
diff --git a/demo-app/Gemfile.lock b/demo-app/Gemfile.lock
deleted file mode 100644
index 757656f..0000000
--- a/demo-app/Gemfile.lock
+++ /dev/null
@@ -1,67 +0,0 @@
-PATH
-  remote: ..
-  specs:
-    sinja (0.2.0.beta2)
-      activesupport (>= 4.2.7.1, < 6)
-      json (>= 1.8.3, < 3)
-      jsonapi-serializers (~> 0.16)
-      mustermann (>= 1.0.0.beta2, < 2)
-      sinatra (>= 1.4.7, < 3)
-      sinatra-contrib (>= 1.4.7, < 3)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activesupport (5.0.0.1)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-    backports (3.6.8)
-    concurrent-ruby (1.0.2)
-    i18n (0.7.0)
-    json (2.0.2)
-    jsonapi-serializers (0.16.1)
-      activesupport
-    minitest (5.10.0)
-    minitest-hooks (1.4.0)
-    multi_json (1.12.1)
-    mustermann (1.0.0.beta2)
-    rack (1.6.5)
-    rack-protection (1.5.3)
-      rack
-    rack-test (0.6.3)
-      rack (>= 1.0)
-    rake (11.3.0)
-    sequel (4.40.0)
-    sinatra (1.4.7)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
-    sinatra-contrib (1.4.7)
-      backports (>= 2.0)
-      multi_json
-      rack-protection
-      rack-test
-      sinatra (~> 1.4.0)
-      tilt (>= 1.3, < 3)
-    sqlite3 (1.3.12)
-    thread_safe (0.3.5)
-    tilt (2.0.5)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  bundler (~> 1.11)
-  minitest (~> 5.9)
-  minitest-hooks (~> 1.4)
-  rake (~> 11.3)
-  sequel (~> 4.38)
-  sinja!
-  sqlite3 (~> 1.3)
-
-BUNDLED WITH
-   1.13.6
diff --git a/demo-app/classes/comment.rb b/demo-app/classes/comment.rb
index eb65947..d401c05 100644
--- a/demo-app/classes/comment.rb
+++ b/demo-app/classes/comment.rb
@@ -81,6 +81,9 @@ def role
     end
 
     graft(roles: :superuser, sideload_on: :create) do |rio|
+      halt 403, 'You may only assign yourself as comment author!' \
+        unless role?(:superuser) || rio[:id].to_i == current_user.id
+
       resource.author = Author.with_pk!(rio[:id].to_i)
       resource.save_changes(validate: !sideloaded?)
     end
diff --git a/lib/sinja/version.rb b/lib/sinja/version.rb
index fbaaed5..32183d2 100644
--- a/lib/sinja/version.rb
+++ b/lib/sinja/version.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 module Sinja
-  VERSION = '0.2.0.beta2'.freeze
+  VERSION = '1.0.0.pre1'
 end