diff --git a/Gemfile.lock b/Gemfile.lock
index 9bcb8ee0..82e7ff55 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -51,7 +51,7 @@ GEM
     public_suffix (4.0.6)
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
-      ffi (1.15.4)
+      ffi (1.0)
     rexml (3.2.5)
     rouge (3.26.1)
     safe_yaml (1.0.5)