diff --git a/Gemfile.lock b/Gemfile.lock
index 459380bf..20f23473 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -299,7 +299,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rchardet (1.8.0)
-    rdoc (6.3.0)
+    rdoc (6.3.3)
     regexp_parser (2.0.3)
     responders (2.4.1)
       actionpack (>= 4.2.0, < 6.0)
@@ -363,8 +363,8 @@ GEM
     scrub_rb (1.0.1)
     scss_lint (0.59.0)
       sass (~> 3.5, >= 3.5.5)
-    sdoc (2.1.0)
-      rdoc (>= 5.0)
+    sdoc (2.3.1)
+      rdoc (>= 5.0, < 6.4.0)
     selenium-webdriver (3.142.7)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)