diff --git a/Gopkg.toml b/Gopkg.toml
index 08cbe2e811f..e6fa9a29e64 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -9,8 +9,6 @@ required = [
   "k8s.io/code-generator/cmd/client-gen",
   "k8s.io/code-generator/cmd/lister-gen",
   "k8s.io/code-generator/cmd/informer-gen",
-  "github.com/google/go-containerregistry/cmd/ko",
-  "github.com/mattmoor/dep-collector",
 ]
 
 [prune]
diff --git a/hack/update-deps.sh b/hack/update-deps.sh
index 13877030869..be2a86774c9 100755
--- a/hack/update-deps.sh
+++ b/hack/update-deps.sh
@@ -14,14 +14,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Load github.com/knative/test-infra/images/prow-tests/scripts/library.sh
+[ -f /workspace/library.sh ] \
+  && source /workspace/library.sh \
+  || eval "$(docker run --entrypoint sh gcr.io/knative-tests/test-infra/prow-tests -c 'cat library.sh')"
+[ -v KNATIVE_TEST_INFRA ] || exit 1
+
 set -o errexit
 set -o nounset
 set -o pipefail
 
-SCRIPT_ROOT=$(dirname ${BASH_SOURCE})/..
-
-pushd ${SCRIPT_ROOT}
-trap popd EXIT
+cd ${REPO_ROOT_DIR}
 
 # Ensure we have everything we need under vendor/
 dep ensure
@@ -29,5 +32,4 @@ dep ensure
 rm -rf $(find vendor/ -name 'BUILD')
 rm -rf $(find vendor/ -name 'BUILD.bazel')
 
-# Run dep-collector to update our VENDOR-LICENSE
-go run ./vendor/github.com/mattmoor/dep-collector/*.go ./cmd/* > third_party/VENDOR-LICENSE
+update_licenses third_party/VENDOR-LICENSE "./cmd/*"
diff --git a/test/presubmit-tests.sh b/test/presubmit-tests.sh
index 857f883d214..d562d9a26ca 100755
--- a/test/presubmit-tests.sh
+++ b/test/presubmit-tests.sh
@@ -44,7 +44,7 @@ function build_tests() {
   # Fetch the google/licenseclassifier for its license db
   go get github.com/google/licenseclassifier || return 1
   # Check that we don't have any forbidden licenses in our images.
-  go run ./vendor/github.com/mattmoor/dep-collector/*.go -check ./cmd/* || result=1
+  dep-collector -check ./cmd/* || result=1
   return ${result}
 }