diff --git a/Library/Homebrew/cask/test/cask/artifact/alt_target_test.rb b/Library/Homebrew/cask/test/cask/artifact/alt_target_test.rb
index 83d21e3ffca779a4fa78db71d972af625c007c88..da273a6ca89fab1d52d9c5a45cf1a55ebab03e97 100644
--- a/Library/Homebrew/cask/test/cask/artifact/alt_target_test.rb
+++ b/Library/Homebrew/cask/test/cask/artifact/alt_target_test.rb
@@ -5,7 +5,7 @@ describe Hbc::Artifact::App do
     let(:cask) { Hbc.load("with-alt-target") }
 
     let(:install_phase) {
-      lambda { Hbc::Artifact::App.new(cask).install_phase }
+      -> { Hbc::Artifact::App.new(cask).install_phase }
     }
 
     let(:source_path) { cask.staged_path.join("Caffeine.app") }
diff --git a/Library/Homebrew/cask/test/cask/artifact/app_test.rb b/Library/Homebrew/cask/test/cask/artifact/app_test.rb
index acd5b2b633c6f29f5880803c56c18fd1ffa44f07..ea8fe1668266c41da12babbcd794a6d8ea91e5aa 100644
--- a/Library/Homebrew/cask/test/cask/artifact/app_test.rb
+++ b/Library/Homebrew/cask/test/cask/artifact/app_test.rb
@@ -9,13 +9,8 @@ describe Hbc::Artifact::App do
   let(:source_path) { cask.staged_path.join("Caffeine.app") }
   let(:target_path) { Hbc.appdir.join("Caffeine.app") }
 
-  let(:install_phase) {
-    lambda { app.install_phase }
-  }
-
-  let(:uninstall_phase) {
-    lambda { app.uninstall_phase }
-  }
+  let(:install_phase) { -> { app.install_phase } }
+  let(:uninstall_phase) { -> { app.uninstall_phase } }
 
   before do
     TestHelper.install_without_artifacts(cask)
diff --git a/Library/Homebrew/cask/test/cask/artifact/generic_artifact_test.rb b/Library/Homebrew/cask/test/cask/artifact/generic_artifact_test.rb
index 1c89b0a38d24ee0e67127896f98584cf6c67fd5e..c7ad1da615ce4e20b23ba25b183af46eed1158d3 100644
--- a/Library/Homebrew/cask/test/cask/artifact/generic_artifact_test.rb
+++ b/Library/Homebrew/cask/test/cask/artifact/generic_artifact_test.rb
@@ -4,7 +4,7 @@ describe Hbc::Artifact::Artifact do
   let(:cask) { Hbc.load("with-generic-artifact") }
 
   let(:install_phase) {
-    lambda { Hbc::Artifact::Artifact.new(cask).install_phase }
+    -> { Hbc::Artifact::Artifact.new(cask).install_phase }
   }
 
   let(:source_path) { cask.staged_path.join("Caffeine.app") }
diff --git a/Library/Homebrew/cask/test/cask/artifact/suite_test.rb b/Library/Homebrew/cask/test/cask/artifact/suite_test.rb
index 72e3351ee25357fd7b7f67ccc12c90afc549f086..f14a9a67c7e69413c1f8ddbf9993eefe54a69db1 100644
--- a/Library/Homebrew/cask/test/cask/artifact/suite_test.rb
+++ b/Library/Homebrew/cask/test/cask/artifact/suite_test.rb
@@ -3,9 +3,7 @@ require "test_helper"
 describe Hbc::Artifact::Suite do
   let(:cask) { Hbc.load("with-suite") }
 
-  let(:install_phase) {
-    lambda { Hbc::Artifact::Suite.new(cask).install_phase }
-  }
+  let(:install_phase) { -> { Hbc::Artifact::Suite.new(cask).install_phase } }
 
   let(:target_path) { Hbc.appdir.join("Caffeine") }
   let(:source_path) { cask.staged_path.join("Caffeine") }
diff --git a/Library/Homebrew/cask/test/cask/artifact/two_apps_correct_test.rb b/Library/Homebrew/cask/test/cask/artifact/two_apps_correct_test.rb
index bb168d2bae903710739fc7f01a54c0126c982306..b37ba370e82f2da26fcde6a5ced0e95e17458294 100644
--- a/Library/Homebrew/cask/test/cask/artifact/two_apps_correct_test.rb
+++ b/Library/Homebrew/cask/test/cask/artifact/two_apps_correct_test.rb
@@ -5,7 +5,7 @@ describe Hbc::Artifact::App do
     let(:cask) { Hbc.load("with-two-apps-correct") }
 
     let(:install_phase) {
-      lambda { Hbc::Artifact::App.new(cask).install_phase }
+      -> { Hbc::Artifact::App.new(cask).install_phase }
     }
 
     let(:source_path_mini) { cask.staged_path.join("Caffeine Mini.app") }