diff --git a/Gopkg.lock b/Gopkg.lock
index 492f172bd1f..b264b39da12 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -589,11 +589,12 @@
   version = "v1.0.3"
 
 [[projects]]
-  digest = "1:5558ceef0c045f9c8a0c08c6e0de89bb0895b1aad69d9722b3748f003564b8cb"
+  branch = "master"
+  digest = "1:52353264b6df3bd5c5da47f84904456a0c81f7f59d224b4da9675d0dc78bbf3e"
   name = "github.com/tektoncd/plumbing"
   packages = ["scripts"]
   pruneopts = "UT"
-  revision = "a51e87c5261fdb718470c077c155e070aca690a8"
+  revision = "933f0722e02cf10a891027381ba8a01ac4c8530e"
 
 [[projects]]
   digest = "1:b7d98c64e9467a8e5e67509031cd6baee81fba090ba2c3d30df1ff3d02d1d035"
diff --git a/Gopkg.toml b/Gopkg.toml
index 399a26835dc..fe7251d2c51 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -72,11 +72,6 @@ required = [
   # HEAD as of 2019-07-23
   revision = "2032732871ff807958e045858b462d372eec9587"
 
-[[constraint]]
-  name = "github.com/tektoncd/plumbing"
-  # HEAD as of 2019-06-24
-  revision = "a51e87c5261fdb718470c077c155e070aca690a8"
-
 [[constraint]]
   name = "github.com/knative/test-infra"
   # HEAD as of 2019-06-25
diff --git a/vendor/github.com/tektoncd/plumbing/scripts/library.sh b/vendor/github.com/tektoncd/plumbing/scripts/library.sh
index 5f2e287e920..1d216fe6739 100755
--- a/vendor/github.com/tektoncd/plumbing/scripts/library.sh
+++ b/vendor/github.com/tektoncd/plumbing/scripts/library.sh
@@ -310,23 +310,6 @@ function report_go_test() {
   return ${failed}
 }
 
-# Install the latest stable Tekton/serving in the current cluster.
-function start_latest_tekton_serving() {
-  header "Starting Tekton Serving"
-  subheader "Installing Istio"
-  echo "Running Istio CRD from ${TEKTON_ISTIO_CRD_YAML}"
-  kubectl apply -f ${TEKTON_ISTIO_CRD_YAML} || return 1
-  wait_until_batch_job_complete istio-system || return 1
-  echo "Installing Istio from ${TEKTON_ISTIO_YAML}"
-  kubectl apply -f ${TEKTON_ISTIO_YAML} || return 1
-  wait_until_pods_running istio-system || return 1
-  kubectl label namespace default istio-injection=enabled || return 1
-  subheader "Installing Tekton Serving"
-  echo "Installing Serving from ${TEKTON_SERVING_RELEASE}"
-  kubectl apply -f ${TEKTON_SERVING_RELEASE} || return 1
-  wait_until_pods_running tekton-serving || return 1
-}
-
 # Run a go tool, installing it first if necessary.
 # Parameters: $1 - tool package/dir for go get/install.
 #             $2 - tool to run.
diff --git a/vendor/github.com/tektoncd/plumbing/scripts/presubmit-tests.sh b/vendor/github.com/tektoncd/plumbing/scripts/presubmit-tests.sh
index afed176050d..742240b8b13 100755
--- a/vendor/github.com/tektoncd/plumbing/scripts/presubmit-tests.sh
+++ b/vendor/github.com/tektoncd/plumbing/scripts/presubmit-tests.sh
@@ -130,12 +130,20 @@ function markdown_build_tests() {
 }
 
 # Default build test runner that:
+# * check go code style with gofmt
 # * check markdown files
 # * `go build` on the entire repo
 # * run `/hack/verify-codegen.sh` (if it exists)
 # * check licenses in all go packages
 function default_build_test_runner() {
   local failed=0
+  # Check go code style with gofmt; exclude vendor/ files
+  subheader "Checking go code style with gofmt"
+  gofmt_out=$(gofmt -d $(find * -name '*.go' ! -path 'vendor/*'))
+  if [[ -n "$gofmt_out" ]]; then
+    failed=1
+  fi
+  echo "$gofmt_out"
   # Perform markdown build checks first
   markdown_build_tests || failed=1
   # For documentation PRs, just check the md files