diff --git a/Gemfile b/Gemfile
index 32a1abee9..941100bef 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,7 +17,7 @@ end
 
 group(:generate_references) do
   gem 'yard', '~> 0.9'
-  gem 'rdoc', '~> 6.2'
+  gem 'rdoc', '~> 6.5'
   gem 'rgen', '~> 0.8'
   gem 'pandoc-ruby'
   gem 'puppet-strings'
diff --git a/Gemfile.lock b/Gemfile.lock
index a37645959..900b70f77 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -89,7 +89,7 @@ GEM
       forwardable-extended (~> 2.6)
     pragmatic_segmenter (0.3.23)
       unicode
-    psych (4.0.6)
+    psych (5.1.0)
       stringio
     public_suffix (5.0.0)
     punkt-segmenter (0.9.1)
@@ -132,7 +132,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rchardet (1.8.0)
-    rdoc (6.4.0)
+    rdoc (6.5.0)
       psych (>= 4.0.0)
     rexml (3.2.5)
     rgen (0.9.0)
@@ -141,7 +141,7 @@ GEM
     sassc (2.4.0)
       ffi (~> 1.9)
     semantic_puppet (1.0.4)
-    stringio (3.0.2)
+    stringio (3.0.6)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     thor (1.2.1)
@@ -183,7 +183,7 @@ DEPENDENCIES
   puppet_docs!
   rack (~> 2.2, >= 2.2.3)
   rake (~> 13.0, >= 13.0.1)
-  rdoc (~> 6.2)
+  rdoc (~> 6.5)
   rgen (~> 0.8)
   versionomy (~> 0.5.0)
   vlad (~> 2.7)