diff --git a/Gemfile.lock b/Gemfile.lock
old mode 100755
new mode 100644
index 0b5f4bd..b51b035
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,9 +13,9 @@ GEM
     colorator (0.1)
     execjs (2.3.0)
     fast-stemmer (1.0.2)
-    ffi (1.9.6)
-    ffi (1.9.6-x64-mingw32)
-    ffi (1.9.6-x86-mingw32)
+    ffi (1.15.3)
+    ffi (1.15.3-x64-mingw32)
+    ffi (1.15.3-x86-mingw32)
     hitimes (1.2.2)
     hitimes (1.2.2-x86-mingw32)
     jekyll (2.5.3)