diff --git a/Gemfile.lock b/Gemfile.lock
index df5ef538..8eb64cb9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,8 @@ GEM
     rake-compiler (1.3.1)
       rake
     rake-compiler-dock (1.11.0)
-    rb_sys (0.9.124)
+    rb_sys (0.9.125)
+      json (>= 2)
       rake-compiler-dock (= 1.11.0)
     rdoc (7.2.0)
       erb