Gemfile.lock in ladder_drive-0.4.1 vs Gemfile.lock in ladder_drive-0.5.0

@@ -1,10 +1,11 @@
 PATH
   remote: .
   specs:
-    ladder_drive (0.4.1)
+    ladder_drive (0.5.0)
       activesupport (~> 4.2, >= 4.2.7)
+      pi_piper
       thor (~> 0)
 
 GEM
   remote: https://rubygems.org/
   specs:
@@ -12,18 +13,24 @@
       i18n (~> 0.7)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
+    eventmachine (1.0.9)
+    ffi (1.9.18)
+    ffi (1.9.18-x64-mingw32)
     i18n (0.7.0)
     json (1.8.3)
     minitest (5.9.1)
+    pi_piper (2.0.0)
+      eventmachine (= 1.0.9)
+      ffi
     power_assert (0.2.7)
     rake (10.5.0)
     test-unit (3.1.7)
       power_assert
-    thor (0.19.4)
+    thor (0.20.0)
     thread_safe (0.3.5)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
 
 PLATFORMS
@@ -32,10 +39,11 @@
 
 DEPENDENCIES
   activesupport (>= 4.2.7)
   bundler (~> 1.11)
   ladder_drive!
+  pi_piper
   rake (~> 10.0)
   test-unit
 
 BUNDLED WITH
-   1.14.3
+   1.15.4