diff --git a/Gemfile.lock b/Gemfile.lock
index c15a153b..d6e82174 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -106,7 +106,7 @@ GEM
       reline (>= 0.3.1)
     diff-lcs (1.5.0)
     diffy (3.4.2)
-    dockerfile-rails (1.5.8)
+    dockerfile-rails (1.5.9)
       rails
     dotenv (2.8.1)
     erubi (1.12.0)