diff --git a/Gemfile b/Gemfile
index 4f81f1ae7fc5..2eaab75c4c98 100644
--- a/Gemfile
+++ b/Gemfile
@@ -128,7 +128,7 @@ gem 'gitlab-markup', '~> 1.6.2'
 gem 'redcarpet', '~> 3.4'
 gem 'commonmarker', '~> 0.17'
 gem 'RedCloth', '~> 4.3.2'
-gem 'rdoc', '~> 4.2'
+gem 'rdoc', '~> 6.0'
 gem 'org-ruby', '~> 0.9.12'
 gem 'creole', '~> 0.5.0'
 gem 'wikicloth', '0.8.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1dd8576e30bc..88b546941fdb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -703,8 +703,7 @@ GEM
       ffi
     rbnacl-libsodium (1.0.11)
       rbnacl (>= 3.0.1)
-    rdoc (4.2.2)
-      json (~> 1.4)
+    rdoc (6.0.2)
     re2 (1.1.1)
     recaptcha (3.0.0)
       json
@@ -1148,7 +1147,7 @@ DEPENDENCIES
   rblineprof (~> 0.3.6)
   rbnacl (~> 4.0)
   rbnacl-libsodium
-  rdoc (~> 4.2)
+  rdoc (~> 6.0)
   re2 (~> 1.1.1)
   recaptcha (~> 3.0)
   redcarpet (~> 3.4)