diff --git a/Gemfile.lock b/Gemfile.lock
index 89554626..48c33973 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -251,7 +251,7 @@ GEM
     i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     i18n_data (0.13.0)
-    icalendar (2.12.2)
+    icalendar (2.12.4)
       base64
       ice_cube (~> 0.16)
       logger