diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 1f15814..4901dc1
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source 'https://rubygems.org/'
 
 gem 'combinatorics',  '~> 0.4.3'
 gem 'json', '~> 2.1.0'
-gem 'openssl', '~> 2'
+gem 'openssl', '~> 2', '>= 2.1.2'
 
 group :development do
   gem 'rake',           '~> 12.0'
diff --git a/Gemfile.lock b/Gemfile.lock
old mode 100755
new mode 100644
index e013b6f..2f20f46
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,11 +1,14 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    base16 (0.0.2)
     combinatorics (0.4.3)
     diff-lcs (1.3)
     docile (1.1.5)
+    ipaddr (1.2.5)
     json (2.1.0)
-    openssl (2.0.3)
+    openssl (2.2.3)
+      ipaddr
     rake (12.0.0)
     rspec (3.6.0)
       rspec-core (~> 3.6.0)
@@ -32,9 +35,10 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  base16 (~> 0.0.2)
   combinatorics (~> 0.4.3)
   json (~> 2.1.0)
-  openssl (~> 2)
+  openssl (~> 2, >= 2.1.2)
   rake (~> 12.0)
   rspec (~> 3.6)
   rubygems-tasks (~> 0.2)
@@ -45,4 +49,4 @@ RUBY VERSION
    ruby 2.4.1p111
 
 BUNDLED WITH
-   1.16.1
+   1.17.3