diff --git a/Gemfile.lock b/Gemfile.lock
index af3fe0a..684cf9a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,9 +25,8 @@ GEM
       thread_safe (~> 0.1)
       tzinfo (~> 0.3.37)
     ansi (1.4.3)
-    bson (1.12.1)
-    bson_ext (1.12.1)
-      bson (~> 1.12.1)
+    bson (4.8.2)
+    bson_ext (1.5.1)
     builder (3.2.2)
     celluloid (0.15.2)
       timers (~> 1.1.0)
@@ -69,8 +68,8 @@ GEM
       powerbar
     mocha (1.1.0)
       metaclass (~> 0.0.1)
-    mongo (1.12.1)
-      bson (= 1.12.1)
+    mongo (2.12.1)
+      bson (>= 4.8.2, < 5.0.0)
     multi_json (1.11.0)
     netrc (0.10.3)
     numerizer (0.1.1)