diff --git a/gemfiles/typecheck/Gemfile.lock b/gemfiles/typecheck/Gemfile.lock
index 2b126857c6..4ca355aecb 100644
--- a/gemfiles/typecheck/Gemfile.lock
+++ b/gemfiles/typecheck/Gemfile.lock
@@ -108,7 +108,7 @@ GEM
       unicode-display_width (>= 1.1.1, < 4)
     test-unit (3.7.0)
       power_assert
-    thor (1.3.2)
+    thor (1.4.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (3.1.4)