diff --git a/Gemfile.lock b/Gemfile.lock
index 05ba9c7..5868543 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,9 +9,9 @@ GEM
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    kramdown-rfc (1.7.11)
-      kramdown-rfc2629 (= 1.7.11)
-    kramdown-rfc2629 (1.7.11)
+    kramdown-rfc (1.7.13)
+      kramdown-rfc2629 (= 1.7.13)
+    kramdown-rfc2629 (1.7.13)
       certified (~> 1.0)
       differ (~> 0.1)
       json_pure (~> 2.0)
@@ -23,7 +23,9 @@ GEM
       unicode-scripts (~> 1.0)
     net-http-persistent (4.0.2)
       connection_pool (~> 2.2)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
+    strscan (3.1.0)
     unicode-blocks (1.9.0)
     unicode-name (1.12.0)
       unicode-types (~> 1.9)