diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 1f15814..77d4677
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ gem 'json', '~> 2.1.0'
 gem 'openssl', '~> 2'
 
 group :development do
-  gem 'rake',           '~> 12.0'
+  gem 'rake', '~> 12.3', '>= 12.3.3'
   gem 'rubygems-tasks', '~> 0.2'
   gem 'rspec',          '~> 3.6'
   gem 'yard',           '~> 0.9.12'
diff --git a/Gemfile.lock b/Gemfile.lock
old mode 100755
new mode 100644
index e013b6f..ca852e0
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,12 +1,13 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    base16 (0.0.2)
     combinatorics (0.4.3)
     diff-lcs (1.3)
     docile (1.1.5)
     json (2.1.0)
     openssl (2.0.3)
-    rake (12.0.0)
+    rake (12.3.3)
     rspec (3.6.0)
       rspec-core (~> 3.6.0)
       rspec-expectations (~> 3.6.0)
@@ -32,10 +33,11 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  base16 (~> 0.0.2)
   combinatorics (~> 0.4.3)
   json (~> 2.1.0)
   openssl (~> 2)
-  rake (~> 12.0)
+  rake (~> 12.3, >= 12.3.3)
   rspec (~> 3.6)
   rubygems-tasks (~> 0.2)
   simplecov (~> 0.7)
@@ -45,4 +47,4 @@ RUBY VERSION
    ruby 2.4.1p111
 
 BUNDLED WITH
-   1.16.1
+   1.17.3