snippet-java
diff --git a/‎src/python/supply/supply.go‎
Lines changed: 2 additions & 1 deletion b/‎src/python/supply/supply.go‎
Lines changed: 2 additions & 1 deletion
diff --git a/‎src/python/supply/supply_test.go‎
Lines changed: 2 additions & 2 deletions b/‎src/python/supply/supply_test.go‎
Lines changed: 2 additions & 2 deletions
@@ -473,14 +473,15 @@ func (s *Supplier) UninstallUnusedDependencies() error {
 }
 
 func (s *Supplier) RunPip() error {
+	s.Log.BeginStep("Running Pip Install")
 	if exists, err := libbuildpack.FileExists(filepath.Join(s.Stager.DepDir(), "requirements.txt")); err != nil {
 		return fmt.Errorf("Couldn't determine existence of requirements.txt")
 	} else if !exists {
 		s.Log.Debug("Skipping pip install since requirements.txt does not exist")
 		return nil
 	}
 
-	installArgs := []string{"install", "-r", filepath.Join(s.Stager.DepDir(), "requirements.txt"), "--exists-action=w", "--src=" + filepath.Join(s.Stager.DepDir(), "src")}
+	installArgs := []string{"install", "-r", filepath.Join(s.Stager.DepDir(), "requirements.txt"), "--ignore-installed", "--exists-action=w", "--src=" + filepath.Join(s.Stager.DepDir(), "src")}
 	if vendorExists, err := libbuildpack.FileExists(filepath.Join(s.Stager.BuildDir(), "vendor")); err != nil {
 		return fmt.Errorf("Couldn't check vendor existence: %v", err)
 	} else if vendorExists {
 
@@ -473,7 +473,7 @@ cffi==0.9.2
 			})
 			Context("vendor does not exist", func() {
 				It("Runs and outputs pip", func() {
-					mockCommand.EXPECT().Execute(buildDir, gomock.Any(), gomock.Any(), "pip", "install", "-r", filepath.Join(depDir, "requirements.txt"), "--exists-action=w", fmt.Sprintf("--src=%s/src", depDir))
+					mockCommand.EXPECT().Execute(buildDir, gomock.Any(), gomock.Any(), "pip", "install", "-r", filepath.Join(depDir, "requirements.txt"), "--ignore-installed", "--exists-action=w", fmt.Sprintf("--src=%s/src", depDir))
 					Expect(supplier.RunPip()).To(Succeed())
 				})
 			})
@@ -483,7 +483,7 @@ cffi==0.9.2
 					Expect(os.Mkdir(filepath.Join(buildDir, "vendor"), 0755)).To(Succeed())
 				})
 				It("installs the vendor directory", func() {
-					mockCommand.EXPECT().Execute(buildDir, gomock.Any(), gomock.Any(), "pip", "install", "-r", filepath.Join(depDir, "requirements.txt"), "--exists-action=w", fmt.Sprintf("--src=%s/src", depDir), "--no-index", fmt.Sprintf("--find-links=file://%s/vendor", buildDir))
+					mockCommand.EXPECT().Execute(buildDir, gomock.Any(), gomock.Any(), "pip", "install", "-r", filepath.Join(depDir, "requirements.txt"), "--ignore-installed", "--exists-action=w", fmt.Sprintf("--src=%s/src", depDir), "--no-index", fmt.Sprintf("--find-links=file://%s/vendor", buildDir))
 					Expect(supplier.RunPip()).To(Succeed())
 				})
 			})