diff --git a/Gemfile.lock b/Gemfile.lock
index ea0a63e..1bd7970 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -167,7 +167,7 @@ GEM
     kramdown (1.14.0)
     launchy (2.4.3)
       addressable (~> 2.3)
-    letter_opener (1.4.1)
+    letter_opener (1.6.0)
       launchy (~> 2.2)
     loofah (2.2.0)
       crass (~> 1.0.2)