diff --git a/go.mod b/go.mod
index ff32b8eff..2caea00d1 100644
--- a/go.mod
+++ b/go.mod
@@ -55,7 +55,7 @@ require (
 	k8s.io/code-generator v0.18.8
 	k8s.io/gengo v0.0.0-20200205140755-e0e292d8aa12
 	k8s.io/klog v1.0.0
-	knative.dev/test-infra v0.0.0-20201015231956-d236fb0ea9ff
+	knative.dev/test-infra v0.0.0-20201020210659-8f5dc4814ac3
 	sigs.k8s.io/boskos v0.0.0-20200729174948-794df80db9c9
 )
 
diff --git a/go.sum b/go.sum
index d932a11cf..30058c954 100644
--- a/go.sum
+++ b/go.sum
@@ -1909,8 +1909,8 @@ knative.dev/test-infra v0.0.0-20200505052144-5ea2f705bb55/go.mod h1:WqF1Azka+FxP
 knative.dev/test-infra v0.0.0-20200513011557-d03429a76034/go.mod h1:aMif0KXL4g19YCYwsy4Ocjjz5xgPlseYV+B95Oo4JGE=
 knative.dev/test-infra v0.0.0-20200519015156-82551620b0a9/go.mod h1:A5b2OAXTOeHT3hHhVQm3dmtbuWvIDP7qzgtqxA3/2pE=
 knative.dev/test-infra v0.0.0-20200707183444-aed09e56ddc7/go.mod h1:RjYAhXnZqeHw9+B0zsbqSPlae0lCvjekO/nw5ZMpLCs=
-knative.dev/test-infra v0.0.0-20201015231956-d236fb0ea9ff h1:I8tkQx28wNs6v/ymlGv6oKQFASCFHTgJtgo7dvv5XII=
-knative.dev/test-infra v0.0.0-20201015231956-d236fb0ea9ff/go.mod h1:lm0U0k6ARXr8Po0LcSTCfETg63LOF3ajUxcoqy5JSH0=
+knative.dev/test-infra v0.0.0-20201020210659-8f5dc4814ac3 h1:FldGYq5wPrQqGuC8JI3a07nC0lGKqG7wtqvebxonnnE=
+knative.dev/test-infra v0.0.0-20201020210659-8f5dc4814ac3/go.mod h1:lm0U0k6ARXr8Po0LcSTCfETg63LOF3ajUxcoqy5JSH0=
 mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
 mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
 mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f/go.mod h1:4G1h5nDURzA3bwVMZIVpwbkw+04kSxk3rAtzlimaUJw=
diff --git a/vendor/knative.dev/test-infra/scripts/library.sh b/vendor/knative.dev/test-infra/scripts/library.sh
index 7e191d971..3d28f1899 100644
--- a/vendor/knative.dev/test-infra/scripts/library.sh
+++ b/vendor/knative.dev/test-infra/scripts/library.sh
@@ -521,6 +521,7 @@ function add_trap {
 #                         "master".
 # Additional dependencies can be included in the upgrade by providing them in a
 # global env var: FLOATING_DEPS
+# --upgrade will set GOPROXY to direct unless it is already set.
 function go_update_deps() {
   cd "${REPO_ROOT_DIR}" || return 1
 
@@ -541,10 +542,20 @@ function go_update_deps() {
     shift
   done
 
-  if (( UPGRADE )); then
+  if [[ $UPGRADE == 1 ]]; then
     echo "--- Upgrading to ${VERSION}"
+    # From shell parameter expansion:
+    # ${parameter:+word}
+    # If parameter is null or unset, nothing is substituted, otherwise the expansion of word is substituted.
+    # -z is if the length of the string, so skip setting GOPROXY if GOPROXY is already set.
+    if [[ -z ${GOPROXY:+skip} ]]; then
+      export GOPROXY=direct
+      echo "Using 'GOPROXY=direct'."
+    else
+      echo "Respecting 'GOPROXY=${GOPROXY}'."
+    fi
     FLOATING_DEPS+=( $(run_go_tool knative.dev/test-infra/buoy buoy float ${REPO_ROOT_DIR}/go.mod --release ${VERSION} --domain knative.dev) )
-    if (( ${#FLOATING_DEPS[@]} )); then
+    if [[ ${#FLOATING_DEPS[@]} > 0 ]]; then
       echo "Floating deps to ${FLOATING_DEPS[@]}"
       go get -d ${FLOATING_DEPS[@]}
     else
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 8cd4310bd..44b019025 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -929,7 +929,7 @@ k8s.io/utils/buffer
 k8s.io/utils/integer
 k8s.io/utils/pointer
 k8s.io/utils/trace
-# knative.dev/test-infra v0.0.0-20201015231956-d236fb0ea9ff
+# knative.dev/test-infra v0.0.0-20201020210659-8f5dc4814ac3
 ## explicit
 knative.dev/test-infra/scripts
 # sigs.k8s.io/boskos v0.0.0-20200729174948-794df80db9c9