diff --git a/Gemfile.lock b/Gemfile.lock
index 3b322e05b..521ca0b12 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -548,7 +548,7 @@ GEM
       rubocop (~> 0.87)
       rubocop-ast (>= 0.7.1)
     ruby-progressbar (1.11.0)
-    ruby-units (2.3.2)
+    ruby-units (2.4.1)
     ruby-vips (2.1.4)
       ffi (~> 1.12)
     ruby2_keywords (0.0.5)