diff --git a/src/rocksdb2/docs/Gemfile.lock b/src/rocksdb2/docs/Gemfile.lock
index 346fc6c1e..b22fb33c6 100644
--- a/src/rocksdb2/docs/Gemfile.lock
+++ b/src/rocksdb2/docs/Gemfile.lock
@@ -128,10 +128,10 @@ GEM
       faraday (~> 0.8, < 0.10)
     terminal-table (1.7.3)
       unicode-display_width (~> 1.1.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     typhoeus (0.8.0)
       ethon (>= 0.8.0)
-    tzinfo (1.2.2)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     unicode-display_width (1.1.1)