diff --git a/stackdriver/Gemfile.lock b/stackdriver/Gemfile.lock
index 260ff82d6..0c31bbf28 100644
--- a/stackdriver/Gemfile.lock
+++ b/stackdriver/Gemfile.lock
@@ -4,7 +4,7 @@ GEM
     addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
     base64 (0.1.1)
-    concurrent-ruby (1.2.2)
+    concurrent-ruby (1.3.7)
     diff-lcs (1.5.0)
     faraday (2.7.11)
       base64