diff --git a/.doc/Gemfile.lock b/.doc/Gemfile.lock
index e9256d483f..a98de19375 100644
--- a/.doc/Gemfile.lock
+++ b/.doc/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
       kramdown (~> 0.13)
       liquid (~> 2.3)
       maruku (~> 0.5)
-    json (1.7.3)
+    json (2.6.1)
     kramdown (0.13.6)
     liquid (2.3.0)
     maruku (0.6.0)