diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68272ae..5fc8104 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@
 ## Unreleased
 - None
 
+## [0.1.19](releases/tag/v0.1.19) - 2019-03-01
+### Fixed
+- Address CVE-2020-8130 - `rake` OS command injection vulnerability
+
 ## [0.1.18](releases/tag/v0.1.18) - 2018-01-05
 ### Added
 - [#29] Support for im.create and im.counters ([@christianmoretti][])
diff --git a/Gemfile b/Gemfile
index a743565..0801b46 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in rocketchat.gemspec
diff --git a/Rakefile b/Rakefile
index 4c774a2..82bb534 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 
diff --git a/bin/console b/bin/console
index 4847424..058002f 100755
--- a/bin/console
+++ b/bin/console
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'bundler/setup'
 require 'rocketchat'
diff --git a/lib/rocket_chat/error.rb b/lib/rocket_chat/error.rb
index 61b9f17..ab8c60d 100644
--- a/lib/rocket_chat/error.rb
+++ b/lib/rocket_chat/error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   class Error < StandardError; end
   class HTTPError < Error; end
diff --git a/lib/rocket_chat/gem_version.rb b/lib/rocket_chat/gem_version.rb
index bd2bfab..3dea040 100644
--- a/lib/rocket_chat/gem_version.rb
+++ b/lib/rocket_chat/gem_version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
-  VERSION = '0.1.18'.freeze
+  VERSION = '0.1.19'
 end
diff --git a/lib/rocket_chat/im_summary.rb b/lib/rocket_chat/im_summary.rb
index 17bb90e..c78f013 100644
--- a/lib/rocket_chat/im_summary.rb
+++ b/lib/rocket_chat/im_summary.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat IM Summary
diff --git a/lib/rocket_chat/info.rb b/lib/rocket_chat/info.rb
index a8b6760..0999516 100644
--- a/lib/rocket_chat/info.rb
+++ b/lib/rocket_chat/info.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat Info
diff --git a/lib/rocket_chat/message.rb b/lib/rocket_chat/message.rb
index e7f2830..49a2878 100644
--- a/lib/rocket_chat/message.rb
+++ b/lib/rocket_chat/message.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat Message
diff --git a/lib/rocket_chat/messages/channel.rb b/lib/rocket_chat/messages/channel.rb
index 7238157..6728a1a 100644
--- a/lib/rocket_chat/messages/channel.rb
+++ b/lib/rocket_chat/messages/channel.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/chat.rb b/lib/rocket_chat/messages/chat.rb
index 82c0b14..ccbb7fa 100644
--- a/lib/rocket_chat/messages/chat.rb
+++ b/lib/rocket_chat/messages/chat.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/group.rb b/lib/rocket_chat/messages/group.rb
index 928b779..d6b2770 100644
--- a/lib/rocket_chat/messages/group.rb
+++ b/lib/rocket_chat/messages/group.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/im.rb b/lib/rocket_chat/messages/im.rb
index b104ffe..753ab52 100644
--- a/lib/rocket_chat/messages/im.rb
+++ b/lib/rocket_chat/messages/im.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/list_support.rb b/lib/rocket_chat/messages/list_support.rb
index 17b9daa..05d989f 100644
--- a/lib/rocket_chat/messages/list_support.rb
+++ b/lib/rocket_chat/messages/list_support.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/room.rb b/lib/rocket_chat/messages/room.rb
index 0798764..d53fc62 100644
--- a/lib/rocket_chat/messages/room.rb
+++ b/lib/rocket_chat/messages/room.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/room_support.rb b/lib/rocket_chat/messages/room_support.rb
index d224c20..6391ba1 100644
--- a/lib/rocket_chat/messages/room_support.rb
+++ b/lib/rocket_chat/messages/room_support.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/settings.rb b/lib/rocket_chat/messages/settings.rb
index c8be56f..2031d77 100644
--- a/lib/rocket_chat/messages/settings.rb
+++ b/lib/rocket_chat/messages/settings.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/user.rb b/lib/rocket_chat/messages/user.rb
index e00090d..d1e8ee5 100644
--- a/lib/rocket_chat/messages/user.rb
+++ b/lib/rocket_chat/messages/user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/messages/user_support.rb b/lib/rocket_chat/messages/user_support.rb
index c5a6547..76215cc 100644
--- a/lib/rocket_chat/messages/user_support.rb
+++ b/lib/rocket_chat/messages/user_support.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   module Messages
     #
diff --git a/lib/rocket_chat/presence_status.rb b/lib/rocket_chat/presence_status.rb
index 8311bae..9bc5655 100644
--- a/lib/rocket_chat/presence_status.rb
+++ b/lib/rocket_chat/presence_status.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat PresenceStatus
diff --git a/lib/rocket_chat/request_helper.rb b/lib/rocket_chat/request_helper.rb
index 5bc733d..e38642a 100644
--- a/lib/rocket_chat/request_helper.rb
+++ b/lib/rocket_chat/request_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'uri'
 require 'openssl'
 require 'net/http'
@@ -30,7 +32,7 @@ def request_json(path, options = {})
       check_response response, fail_unless_ok
 
       response_json = parse_response(response.body)
-      options[:debug].puts("Response: #{response_json.inspect}") if options[:debug]
+      options[:debug]&.puts("Response: #{response_json.inspect}")
       check_response_json response_json, upstreamed_errors
 
       response_json
diff --git a/lib/rocket_chat/room.rb b/lib/rocket_chat/room.rb
index ed26a28..6424d81 100644
--- a/lib/rocket_chat/room.rb
+++ b/lib/rocket_chat/room.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat Room
diff --git a/lib/rocket_chat/server.rb b/lib/rocket_chat/server.rb
index 205278b..8e1dfd0 100644
--- a/lib/rocket_chat/server.rb
+++ b/lib/rocket_chat/server.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat Server
diff --git a/lib/rocket_chat/session.rb b/lib/rocket_chat/session.rb
index 0a542d3..64866e7 100644
--- a/lib/rocket_chat/session.rb
+++ b/lib/rocket_chat/session.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat Session
diff --git a/lib/rocket_chat/token.rb b/lib/rocket_chat/token.rb
index d3a3857..c5f07f0 100644
--- a/lib/rocket_chat/token.rb
+++ b/lib/rocket_chat/token.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat Token
diff --git a/lib/rocket_chat/user.rb b/lib/rocket_chat/user.rb
index 3d5130b..8cec410 100644
--- a/lib/rocket_chat/user.rb
+++ b/lib/rocket_chat/user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat User
diff --git a/lib/rocket_chat/util.rb b/lib/rocket_chat/util.rb
index 85b1172..4754d50 100644
--- a/lib/rocket_chat/util.rb
+++ b/lib/rocket_chat/util.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RocketChat
   #
   # Rocket.Chat generic utility functions
diff --git a/lib/rocketchat.rb b/lib/rocketchat.rb
index 6bb8fd6..cf6f96c 100644
--- a/lib/rocketchat.rb
+++ b/lib/rocketchat.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rocket_chat/gem_version'
 
 require 'json'
diff --git a/rocketchat.gemspec b/rocketchat.gemspec
index 908ff1b..74d3456 100644
--- a/rocketchat.gemspec
+++ b/rocketchat.gemspec
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
@@ -19,7 +21,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler', ['>= 1.11', '< 3.0']
-  spec.add_development_dependency 'rake', '~> 10.0'
+  spec.add_development_dependency 'rake', '>= 12.3.3'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'rubocop', '~> 0.62'
   spec.add_development_dependency 'rubocop-rspec', '~> 1.31'
diff --git a/spec/rocket_chat/message_spec.rb b/spec/rocket_chat/message_spec.rb
index 3fe8302..307d4ff 100644
--- a/spec/rocket_chat/message_spec.rb
+++ b/spec/rocket_chat/message_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Message do
diff --git a/spec/rocket_chat/messages/channel_spec.rb b/spec/rocket_chat/messages/channel_spec.rb
index 721c906..3291e8e 100644
--- a/spec/rocket_chat/messages/channel_spec.rb
+++ b/spec/rocket_chat/messages/channel_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Messages::Channel do
diff --git a/spec/rocket_chat/messages/chat_spec.rb b/spec/rocket_chat/messages/chat_spec.rb
index 298e944..d4be696 100644
--- a/spec/rocket_chat/messages/chat_spec.rb
+++ b/spec/rocket_chat/messages/chat_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Messages::Chat do
diff --git a/spec/rocket_chat/messages/group_spec.rb b/spec/rocket_chat/messages/group_spec.rb
index 2625c91..bf26128 100644
--- a/spec/rocket_chat/messages/group_spec.rb
+++ b/spec/rocket_chat/messages/group_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Messages::Group do
diff --git a/spec/rocket_chat/messages/im_spec.rb b/spec/rocket_chat/messages/im_spec.rb
index 102baf0..b0cdad8 100644
--- a/spec/rocket_chat/messages/im_spec.rb
+++ b/spec/rocket_chat/messages/im_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Messages::Im do
diff --git a/spec/rocket_chat/messages/settings_spec.rb b/spec/rocket_chat/messages/settings_spec.rb
index 712da85..b3de2c5 100644
--- a/spec/rocket_chat/messages/settings_spec.rb
+++ b/spec/rocket_chat/messages/settings_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Messages::Settings do
diff --git a/spec/rocket_chat/messages/user_spec.rb b/spec/rocket_chat/messages/user_spec.rb
index 8df4de9..8f4faa3 100644
--- a/spec/rocket_chat/messages/user_spec.rb
+++ b/spec/rocket_chat/messages/user_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Messages::User do
diff --git a/spec/rocket_chat/server_spec.rb b/spec/rocket_chat/server_spec.rb
index 81dbdca..7264697 100644
--- a/spec/rocket_chat/server_spec.rb
+++ b/spec/rocket_chat/server_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Server do
diff --git a/spec/rocket_chat/session_spec.rb b/spec/rocket_chat/session_spec.rb
index b00244a..bc0d51b 100644
--- a/spec/rocket_chat/session_spec.rb
+++ b/spec/rocket_chat/session_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::Session do
diff --git a/spec/rocket_chat/user_spec.rb b/spec/rocket_chat/user_spec.rb
index bbbc2d3..add655a 100644
--- a/spec/rocket_chat/user_spec.rb
+++ b/spec/rocket_chat/user_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe RocketChat::User do
diff --git a/spec/shared/room_behaviors.rb b/spec/shared/room_behaviors.rb
index 6fcf560..6e434db 100644
--- a/spec/shared/room_behaviors.rb
+++ b/spec/shared/room_behaviors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 shared_examples 'room_behavior' do |room_type: nil, query: false|
   let(:server) { RocketChat::Server.new(SERVER_URI) }
   let(:token) { RocketChat::Token.new(authToken: AUTH_TOKEN, userId: USER_ID) }
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index daec7f1..3576c2e 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'simplecov'
 SimpleCov.start
 
@@ -10,11 +12,11 @@
 require 'shared/room_behaviors'
 
 SERVER_URI = URI.parse('http://www.example.com/')
-AUTH_TOKEN = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'.freeze
-USER_ID = 'AAAAAAAAAAAAAAAAA'.freeze
-OTHER_USER_ID = 'BBBBBBBBBBBBBBBBB'.freeze
-USERNAME = 'user'.freeze
-PASSWORD = 'password'.freeze
+AUTH_TOKEN = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'
+USER_ID = 'AAAAAAAAAAAAAAAAA'
+OTHER_USER_ID = 'BBBBBBBBBBBBBBBBB'
+USERNAME = 'user'
+PASSWORD = 'password'
 UNAUTHORIZED_BODY = {
   status: :error,
   message: 'You must be logged in to do this.'