diff --git a/Gemfile.lock b/Gemfile.lock
index 53b576f5..174d8aa3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,13 +1,13 @@
 PATH
   remote: middleman-cli
   specs:
-    middleman-cli (4.3.0.rc.3)
+    middleman-cli (4.3.0.rc.4)
       thor (>= 0.17.0, < 2.0)
 
 PATH
   remote: middleman-core
   specs:
-    middleman-core (4.3.0.rc.3)
+    middleman-core (4.3.0.rc.4)
       activesupport (>= 4.2, < 5.2)
       addressable (~> 2.3)
       backports (~> 3.11)
@@ -71,7 +71,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.3)
     contracts (0.16.0)
     cucumber (3.1.2)
       builder (>= 2.1.2)