diff --git a/rblib/Gemfile.lock b/rblib/Gemfile.lock
index 7e01e16f..e1d619cc 100644
--- a/rblib/Gemfile.lock
+++ b/rblib/Gemfile.lock
@@ -13,8 +13,7 @@ GEM
     power_assert (2.0.3)
     public_suffix (5.0.3)
     rake (13.0.6)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -29,7 +28,6 @@ GEM
       rspec-support (~> 3.12.0)
     rspec-support (3.12.1)
     ruby2_keywords (0.0.5)
-    strscan (3.1.0)
     test-unit (3.6.1)
       power_assert
     unidecoder (1.1.2)