diff --git a/go.mod b/go.mod
index 019404cf5..ecc1fa152 100644
--- a/go.mod
+++ b/go.mod
@@ -20,7 +20,7 @@ require (
 	github.com/knative/build v0.6.0 // indirect
 	github.com/knative/pkg v0.0.0-20190518173526-34792a92cec2
 	github.com/knative/serving v0.6.0
-	github.com/knative/test-infra v0.0.0-20190529123930-7d0c44fb03a9
+	github.com/knative/test-infra v0.0.0-20190531180034-a3c073a2fea1
 	github.com/mattbaird/jsonpatch v0.0.0-20171005235357-81af80346b1a // indirect
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/modern-go/reflect2 v1.0.1 // indirect
diff --git a/go.sum b/go.sum
index 3cf994277..9cb00ba9c 100644
--- a/go.sum
+++ b/go.sum
@@ -151,6 +151,8 @@ github.com/knative/test-infra v0.0.0-20190517181617-d1bb39bbca6e h1:Is4Ki1oQhYD3
 github.com/knative/test-infra v0.0.0-20190517181617-d1bb39bbca6e/go.mod h1:l77IWBscEV5T4sYb64/9iwRCVY4UXEIqMcAppsblHW4=
 github.com/knative/test-infra v0.0.0-20190529123930-7d0c44fb03a9 h1:2kupVzyk+zet/S5bHMAQLxt1rQzqTsJd+vUXp7tIYcI=
 github.com/knative/test-infra v0.0.0-20190529123930-7d0c44fb03a9/go.mod h1:l77IWBscEV5T4sYb64/9iwRCVY4UXEIqMcAppsblHW4=
+github.com/knative/test-infra v0.0.0-20190531180034-a3c073a2fea1 h1:Y2QunZIzGuyvBNfWNpwK9/AAgu2P+Aa+k/3ykATGw30=
+github.com/knative/test-infra v0.0.0-20190531180034-a3c073a2fea1/go.mod h1:l77IWBscEV5T4sYb64/9iwRCVY4UXEIqMcAppsblHW4=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
diff --git a/vendor/github.com/knative/test-infra/scripts/e2e-tests.sh b/vendor/github.com/knative/test-infra/scripts/e2e-tests.sh
index fb2bced10..b6faf49a7 100644
--- a/vendor/github.com/knative/test-infra/scripts/e2e-tests.sh
+++ b/vendor/github.com/knative/test-infra/scripts/e2e-tests.sh
@@ -300,6 +300,10 @@ function setup_test_cluster() {
     export KO_DOCKER_REPO=gcr.io/${E2E_PROJECT_ID}/${E2E_BASE_NAME}-e2e-img
   fi
 
+  # Safety checks
+  is_protected_gcr ${KO_DOCKER_REPO} && \
+    abort "\$KO_DOCKER_REPO set to ${KO_DOCKER_REPO}, which is forbidden"
+
   echo "- Project is ${E2E_PROJECT_ID}"
   echo "- Cluster is ${k8s_cluster}"
   echo "- User is ${k8s_user}"
@@ -423,10 +427,6 @@ function initialize() {
 
   (( IS_PROW )) && [[ -z "${GCP_PROJECT}" ]] && IS_BOSKOS=1
 
-  # Safety checks
-  is_protected_gcr ${KO_DOCKER_REPO} && \
-    abort "\$KO_DOCKER_REPO set to ${KO_DOCKER_REPO}, which is forbidden"
-
   (( SKIP_ISTIO_ADDON )) || GKE_ADDONS="--addons=Istio"
 
   readonly RUN_TESTS
diff --git a/vendor/github.com/knative/test-infra/scripts/library.sh b/vendor/github.com/knative/test-infra/scripts/library.sh
index 4d7206bf1..d3e98d5b0 100644
--- a/vendor/github.com/knative/test-infra/scripts/library.sh
+++ b/vendor/github.com/knative/test-infra/scripts/library.sh
@@ -331,17 +331,10 @@ function report_go_test() {
 function start_latest_knative_serving() {
   header "Starting Knative Serving"
   subheader "Installing Knative Serving"
-  echo "Installing Serving from ${KNATIVE_SERVING_RELEASE}"
-  # Some CRDs defined in serving YAML are also referenced by other components in serving. As it takes
-  # time for CRDs to become effective, there is a race condition between when the CRDs are effective
-  # and when the resources that references those CRDs are created.
-  # The current workaround is to re-apply serving.yaml if it fails. Remove the retry logic after the
-  # race condition is fixed. (https://github.com/knative/serving/issues/4176)
-  if ! kubectl apply -f ${KNATIVE_SERVING_RELEASE}; then
-    echo "Install failed, waiting 60s and then retrying..."
-    sleep 60
-    kubectl apply -f ${KNATIVE_SERVING_RELEASE} || return 1
-  fi
+  echo "Installing Serving CRDs from ${KNATIVE_SERVING_RELEASE}"
+  kubectl apply --selector knative.dev/crd-install=true -f ${KNATIVE_SERVING_RELEASE}
+  echo "Installing the rest of serving components from ${KNATIVE_SERVING_RELEASE}"
+  kubectl apply -f ${KNATIVE_SERVING_RELEASE}
   wait_until_pods_running knative-serving || return 1
 }
 
@@ -475,21 +468,32 @@ function get_canonical_path() {
   echo "$(cd ${path%/*} && echo $PWD/${path##*/})"
 }
 
-# Return the base url we use to build the actual knative yaml sources.
-function get_knative_base_yaml_source() {
-  local knative_base_yaml_source="https://storage.googleapis.com/knative-nightly/@/latest"
+# Returns the URL to the latest manifest for the given Knative project.
+# Parameters: $1 - repository name of the given project
+#             $2 - name of the yaml file, without extension
+function get_latest_knative_yaml_source() {
   local branch_name=""
+  local repo_name="$1"
+  local yaml_name="$2"
   # Get the branch name from Prow's env var, see https://github.com/kubernetes/test-infra/blob/master/prow/jobs.md.
   # Otherwise, try getting the current branch from git.
   (( IS_PROW )) && branch_name="${PULL_BASE_REF:-}"
   [[ -z "${branch_name}" ]] && branch_name="$(git rev-parse --abbrev-ref HEAD)"
-  # If it's a release branch, base URL should point to a specific version.
+  # If it's a release branch, the yaml source URL should point to a specific version.
   if [[ ${branch_name} =~ ^release-[0-9\.]+$ ]]; then
     # Get the latest tag name for the current branch, which is likely formatted as v0.5.0
     local tag_name="$(git describe --tags --abbrev=0)"
-    knative_base_yaml_source="https://storage.googleapis.com/knative-releases/@/previous/${tag_name}"
+    # The given repo might not have this tag, so we need to find its latest release manifest with the same major&minor version.
+    local major_minor="$(echo ${tag_name} | cut -d. -f1-2)"
+    local yaml_source_path="$(gsutil ls gs://knative-releases/${repo_name}/previous/${major_minor}.*/${yaml_name}.yaml \
+      | sort \
+      | tail -n 1 \
+      | cut -b6-)"
+    echo "https://storage.googleapis.com/${yaml_source_path}"
+  # If it's not a release branch, the yaml source URL should be nightly build.
+  else
+    echo "https://storage.googleapis.com/knative-nightly/${repo_name}/latest/${yaml_name}.yaml"
   fi
-  echo "${knative_base_yaml_source}"
 }
 
 # Initializations that depend on previous functions.
@@ -499,7 +503,6 @@ readonly _TEST_INFRA_SCRIPTS_DIR="$(dirname $(get_canonical_path ${BASH_SOURCE[0
 readonly REPO_NAME_FORMATTED="Knative $(capitalize ${REPO_NAME//-/})"
 
 # Public latest nightly or release yaml files.
-readonly KNATIVE_BASE_YAML_SOURCE="$(get_knative_base_yaml_source)"
-readonly KNATIVE_SERVING_RELEASE="${KNATIVE_BASE_YAML_SOURCE/@/serving}/serving.yaml"
-readonly KNATIVE_BUILD_RELEASE="${KNATIVE_BASE_YAML_SOURCE/@/build}/build.yaml"
-readonly KNATIVE_EVENTING_RELEASE="${KNATIVE_BASE_YAML_SOURCE/@/eventing}/release.yaml"
+readonly KNATIVE_SERVING_RELEASE="$(get_latest_knative_yaml_source "serving" "serving")"
+readonly KNATIVE_BUILD_RELEASE="$(get_latest_knative_yaml_source "build" "build")"
+readonly KNATIVE_EVENTING_RELEASE="$(get_latest_knative_yaml_source "eventing" "release")"
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 3c0965aeb..a09b674b0 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -84,7 +84,7 @@ github.com/knative/serving/pkg/client/clientset/versioned/scheme
 github.com/knative/serving/pkg/client/clientset/versioned/typed/serving/v1alpha1/fake
 github.com/knative/serving/pkg/apis/config
 github.com/knative/serving/pkg/apis/autoscaling/v1alpha1
-# github.com/knative/test-infra v0.0.0-20190529123930-7d0c44fb03a9
+# github.com/knative/test-infra v0.0.0-20190531180034-a3c073a2fea1
 github.com/knative/test-infra/scripts
 # github.com/magiconair/properties v1.8.0
 github.com/magiconair/properties