diff --git a/arduino/cosmos/Gemfile.lock b/arduino/cosmos/Gemfile.lock
index 69e603e..b2586b2 100644
--- a/arduino/cosmos/Gemfile.lock
+++ b/arduino/cosmos/Gemfile.lock
@@ -26,7 +26,7 @@ GEM
   specs:
     coderay (1.1.2)
     httpclient (2.8.3)
-    json (2.2.0)
+    json (2.3.1)
     method_source (0.9.2)
     mini_portile2 (2.4.0)
     nokogiri (1.10.3)