Gemfile.lock in brief-1.8.11 vs Gemfile.lock in brief-1.8.12

@@ -1,10 +1,9 @@
 PATH
   remote: .
   specs:
-    brief (1.8.10)
-      activemodel
+    brief (1.8.12)
       activesupport (>= 4.0)
       commander (>= 4.2.1)
       github-fs
       github-markdown (~> 0.6.8)
       hashie (< 3.0)
@@ -13,13 +12,10 @@
       virtus (>= 1.0.3)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (4.2.1)
-      activesupport (= 4.2.1)
-      builder (~> 3.1)
     activesupport (4.2.1)
       i18n (~> 0.7)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
@@ -27,10 +23,9 @@
     addressable (2.3.7)
     axiom-types (0.1.1)
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
-    builder (3.2.2)
     coderay (1.1.0)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
     commander (4.3.1)
       highline (~> 1.7.1)