diff --git a/Gemfile.lock b/Gemfile.lock
index 03e790d..53a865d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
   specs:
     ast (2.4.3)
     base64 (0.3.0)
-    bigdecimal (4.0.1)
+    bigdecimal (4.1.0)
     bitflyer (2.0.2)
       faraday (>= 2.0)
       websocket-client-simple (>= 0.9)