diff --git a/Library/Homebrew/cmd/deps.rb b/Library/Homebrew/cmd/deps.rb
index 2d7863255f..4cb93befde 100644
--- a/Library/Homebrew/cmd/deps.rb
+++ b/Library/Homebrew/cmd/deps.rb
@@ -4,7 +4,7 @@ require "formula"
 require "ostruct"
 require "cli/parser"
 require "cask/caskroom"
-require "cask_dependent"
+require "dependencies_helpers"
 
 module Homebrew
   extend DependenciesHelpers
@@ -110,16 +110,6 @@ module Homebrew
     puts all_deps
   end
 
-  def dependents(formulae_or_casks)
-    formulae_or_casks.map do |formula_or_cask|
-      if formula_or_cask.is_a?(Formula)
-        formula_or_cask
-      else
-        CaskDependent.new(formula_or_cask)
-      end
-    end
-  end
-
   def sorted_dependents(formulae_or_casks)
     dependents(formulae_or_casks).sort_by(&:name)
   end
diff --git a/Library/Homebrew/cmd/uses.rb b/Library/Homebrew/cmd/uses.rb
index ba71e0972d..91e58e9dbd 100644
--- a/Library/Homebrew/cmd/uses.rb
+++ b/Library/Homebrew/cmd/uses.rb
@@ -6,6 +6,8 @@
 
 require "formula"
 require "cli/parser"
+require "cask/caskroom"
+require "dependencies_helpers"
 
 module Homebrew
   extend DependenciesHelpers
@@ -68,39 +70,22 @@ module Homebrew
                              !args.include_optional? &&
                              !args.skip_recommended?
 
+    recursive = args.recursive?
+    includes, ignores = args_includes_ignores(args)
+
     uses = if use_runtime_dependents && !used_formulae_missing
       used_formulae.map(&:runtime_installed_formula_dependents)
                    .reduce(&:&)
-                   .select(&:any_version_installed?)
+                   .select(&:any_version_installed?) +
+        select_used_dependents(dependents(Cask::Caskroom.casks), used_formulae, recursive, includes, ignores)
     else
-      formulae = args.installed? ? Formula.installed : Formula
-      recursive = args.recursive?
-      includes, ignores = args_includes_ignores(args)
-
-      formulae.select do |f|
-        deps = if recursive
-          recursive_includes(Dependency, f, includes, ignores)
-        else
-          reject_ignores(f.deps, ignores, includes)
-        end
-
-        used_formulae.all? do |ff|
-          deps.any? do |dep|
-            match = begin
-              dep.to_formula.full_name == ff.full_name if dep.name.include?("/")
-            rescue
-              nil
-            end
-            next match unless match.nil?
-
-            dep.name == ff.name
-          end
-        rescue FormulaUnavailableError
-          # Silently ignore this case as we don't care about things used in
-          # taps that aren't currently tapped.
-          next
-        end
+      deps = if args.installed?
+        dependents(Formula.installed + Cask::Caskroom.casks)
+      else
+        dependents(Formula.to_a + Cask::Cask.to_a)
       end
+
+      select_used_dependents(deps, used_formulae, recursive, includes, ignores)
     end
 
     return if uses.empty?
@@ -108,4 +93,31 @@ module Homebrew
     puts Formatter.columns(uses.map(&:full_name).sort)
     odie "Missing formulae should not have dependents!" if used_formulae_missing
   end
+
+  def select_used_dependents(dependents, used_formulae, recursive, includes, ignores)
+    dependents.select do |d|
+      deps = if recursive
+        recursive_includes(Dependency, d, includes, ignores)
+      else
+        reject_ignores(d.deps, ignores, includes)
+      end
+
+      used_formulae.all? do |ff|
+        deps.any? do |dep|
+          match = begin
+            dep.to_formula.full_name == ff.full_name if dep.name.include?("/")
+          rescue
+            nil
+          end
+          next match unless match.nil?
+
+          dep.name == ff.name
+        end
+      rescue FormulaUnavailableError
+        # Silently ignore this case as we don't care about things used in
+        # taps that aren't currently tapped.
+        next
+      end
+    end
+  end
 end
diff --git a/Library/Homebrew/dependencies.rb b/Library/Homebrew/dependencies.rb
index 1ece9e5340..476d1b53ec 100644
--- a/Library/Homebrew/dependencies.rb
+++ b/Library/Homebrew/dependencies.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "delegate"
+require "cask_dependent"
 
 class Dependencies < DelegateClass(Array)
   def initialize(*args)
@@ -55,71 +56,3 @@ class Requirements < DelegateClass(Set)
     "#<#{self.class.name}: {#{to_a.join(", ")}}>"
   end
 end
-
-module DependenciesHelpers
-  def args_includes_ignores(args)
-    includes = []
-    ignores = []
-
-    if args.include_build?
-      includes << "build?"
-    else
-      ignores << "build?"
-    end
-
-    if args.include_test?
-      includes << "test?"
-    else
-      ignores << "test?"
-    end
-
-    if args.include_optional?
-      includes << "optional?"
-    else
-      ignores << "optional?"
-    end
-
-    ignores << "recommended?" if args.skip_recommended?
-
-    [includes, ignores]
-  end
-
-  def recursive_includes(klass, root_dependent, includes, ignores)
-    type = if klass == Dependency
-      :dependencies
-    elsif klass == Requirement
-      :requirements
-    else
-      raise ArgumentError, "Invalid class argument: #{klass}"
-    end
-
-    root_dependent.send("recursive_#{type}") do |dependent, dep|
-      if dep.recommended?
-        klass.prune if ignores.include?("recommended?") || dependent.build.without?(dep)
-      elsif dep.optional?
-        klass.prune if !includes.include?("optional?") && !dependent.build.with?(dep)
-      elsif dep.build? || dep.test?
-        keep = false
-        keep ||= dep.test? && includes.include?("test?") && dependent == root_dependent
-        keep ||= dep.build? && includes.include?("build?")
-        klass.prune unless keep
-      end
-
-      # If a tap isn't installed, we can't find the dependencies of one of
-      # its formulae, and an exception will be thrown if we try.
-      if type == :dependencies &&
-         dep.is_a?(TapDependency) &&
-         !dep.tap.installed?
-        Dependency.keep_but_prune_recursive_deps
-      end
-    end
-  end
-
-  def reject_ignores(dependables, ignores, includes)
-    dependables.reject do |dep|
-      next false unless ignores.any? { |ignore| dep.send(ignore) }
-
-      includes.none? { |include| dep.send(include) }
-    end
-  end
-end
diff --git a/Library/Homebrew/dependencies_helpers.rb b/Library/Homebrew/dependencies_helpers.rb
new file mode 100644
index 0000000000..fb6f13e9d1
--- /dev/null
+++ b/Library/Homebrew/dependencies_helpers.rb
@@ -0,0 +1,82 @@
+# frozen_string_literal: true
+
+require "cask_dependent"
+
+module DependenciesHelpers
+  def args_includes_ignores(args)
+    includes = []
+    ignores = []
+
+    if args.include_build?
+      includes << "build?"
+    else
+      ignores << "build?"
+    end
+
+    if args.include_test?
+      includes << "test?"
+    else
+      ignores << "test?"
+    end
+
+    if args.include_optional?
+      includes << "optional?"
+    else
+      ignores << "optional?"
+    end
+
+    ignores << "recommended?" if args.skip_recommended?
+
+    [includes, ignores]
+  end
+
+  def recursive_includes(klass, root_dependent, includes, ignores)
+    type = if klass == Dependency
+      :dependencies
+    elsif klass == Requirement
+      :requirements
+    else
+      raise ArgumentError, "Invalid class argument: #{klass}"
+    end
+
+    root_dependent.send("recursive_#{type}") do |dependent, dep|
+      if dep.recommended?
+        klass.prune if ignores.include?("recommended?") || dependent.build.without?(dep)
+      elsif dep.optional?
+        klass.prune if !includes.include?("optional?") && !dependent.build.with?(dep)
+      elsif dep.build? || dep.test?
+        keep = false
+        keep ||= dep.test? && includes.include?("test?") && dependent == root_dependent
+        keep ||= dep.build? && includes.include?("build?")
+        klass.prune unless keep
+      end
+
+      # If a tap isn't installed, we can't find the dependencies of one of
+      # its formulae, and an exception will be thrown if we try.
+      if type == :dependencies &&
+         dep.is_a?(TapDependency) &&
+         !dep.tap.installed?
+        Dependency.keep_but_prune_recursive_deps
+      end
+    end
+  end
+
+  def reject_ignores(dependables, ignores, includes)
+    dependables.reject do |dep|
+      next false unless ignores.any? { |ignore| dep.send(ignore) }
+
+      includes.none? { |include| dep.send(include) }
+    end
+  end
+
+  def dependents(formulae_or_casks)
+    formulae_or_casks.map do |formula_or_cask|
+      if formula_or_cask.is_a?(Formula)
+        formula_or_cask
+      else
+        CaskDependent.new(formula_or_cask)
+      end
+    end
+  end
+  module_function :dependents
+end
diff --git a/Library/Homebrew/test/dependencies_helpers_spec.rb b/Library/Homebrew/test/dependencies_helpers_spec.rb
new file mode 100644
index 0000000000..4686084bce
--- /dev/null
+++ b/Library/Homebrew/test/dependencies_helpers_spec.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+require "dependencies_helpers"
+
+describe DependenciesHelpers do
+  specify "#dependents" do
+    foo = formula "foo" do
+      url "foo"
+      version "1.0"
+    end
+
+    foo_cask = Cask::CaskLoader.load(+<<-RUBY)
+      cask "foo_cask" do
+      end
+    RUBY
+
+    bar = formula "bar" do
+      url "bar-url"
+      version "1.0"
+    end
+
+    bar_cask = Cask::CaskLoader.load(+<<-RUBY)
+      cask "bar-cask" do
+      end
+    RUBY
+
+    methods = [
+      :name,
+      :full_name,
+      :runtime_dependencies,
+      :deps,
+      :requirements,
+      :recursive_dependencies,
+      :recursive_requirements,
+      :any_version_installed?,
+    ]
+
+    dependents = described_class.dependents([foo, foo_cask, bar, bar_cask])
+
+    dependents.each do |dependent|
+      methods.each do |method|
+        expect(dependent.respond_to?(method))
+          .to be true
+      end
+    end
+  end
+end