diff --git a/README.md b/README.md
index b61b843..9218077 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ and development.
 ## Requirements
 
 * [Ruby] >= 3.0.0
-* [reline] ~> 0.1
+* [reline] ~> 0.4
 * [command_kit] ~> 0.6
 * [irb] ~> 1.0
 
diff --git a/gemspec.yml b/gemspec.yml
index ac1f8ee..a1170f6 100644
--- a/gemspec.yml
+++ b/gemspec.yml
@@ -20,7 +20,7 @@ metadata:
 required_ruby_version: ">= 3.0.0"
 
 dependencies:
-  reline: ~> 0.1
+  reline: ~> 0.4
   command_kit: ~> 0.6
   irb: ~> 1.0
 
diff --git a/lib/ronin/core/cli/ruby_shell.rb b/lib/ronin/core/cli/ruby_shell.rb
index c321258..5f627af 100644
--- a/lib/ronin/core/cli/ruby_shell.rb
+++ b/lib/ronin/core/cli/ruby_shell.rb
@@ -99,6 +99,7 @@ def configure
           IRB.conf[:IRB_NAME] = @name
 
           set_prompt
+          set_completion_dialog
         end
 
         #
@@ -141,6 +142,19 @@ def set_prompt
           end
         end
 
+        #
+        # Sets colors for the tab-completion menu.
+        #
+        # @since 0.3.0
+        #
+        def set_completion_dialog
+          Reline::Face.config(:completion_dialog) do |conf|
+            conf.define :default, foreground: :gray, background: :cyan
+            conf.define :enhanced, foreground: :gray, background: :green
+            conf.define :scrollbar, foreground: :gray, background: :cyan
+          end
+        end
+
       end
     end
   end