diff --git a/Gemfile.lock b/Gemfile.lock
index 7d5c0366..fc04683a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -307,8 +307,7 @@ GEM
       net-smtp
     marcel (1.0.4)
     matrix (0.4.3)
-    mina (1.2.4)
-      open4 (~> 1.3.4)
+    mina (1.2.5)
       rake
     mini_magick (5.3.1)
       logger
@@ -378,7 +377,6 @@ GEM
     omniauth-rails_csrf_protection (1.0.0)
       actionpack (>= 4.2)
       omniauth (~> 2.0)
-    open4 (1.3.4)
     orm_adapter (0.5.0)
     ostruct (0.6.3)
     paper_trail (16.0.0)