diff --git a/Gemfile.lock b/Gemfile.lock
index 423e897..37e28a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -40,7 +40,7 @@ GEM
       minitest (>= 5.1)
       mutex_m
       tzinfo (~> 2.0)
-    appraisal (2.4.1)
+    appraisal (2.5.0)
       bundler
       rake
       thor (>= 0.14.0)