diff --git a/Gemfile.lock b/Gemfile.lock
index e9621f1..16f7927 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,8 +4,9 @@ GEM
     addressable (2.5.1)
       public_suffix (~> 2.0, >= 2.0.2)
     colorator (1.1.0)
-    ffi (1.9.18-x64-mingw32)
-    ffi (1.9.18-x86-mingw32)
+    ffi (1.12.2)
+    ffi (1.12.2-x64-mingw32)
+    ffi (1.12.2-x86-mingw32)
     forwardable-extended (2.6.0)
     jekyll (3.3.0)
       addressable (~> 2.4)
@@ -44,6 +45,7 @@ GEM
     sass (3.4.24)
 
 PLATFORMS
+  ruby
   x64-mingw32
   x86-mingw32