diff --git a/go.mod b/go.mod
index 38dc227f97..cc78876faa 100644
--- a/go.mod
+++ b/go.mod
@@ -21,11 +21,11 @@ require (
 	k8s.io/client-go v0.26.5
 	k8s.io/code-generator v0.26.5
 	knative.dev/client-pkg v0.0.0-20230815131440-5abd12981b4b
-	knative.dev/eventing v0.38.1-0.20230822134255-a2e2aa3d515d
+	knative.dev/eventing v0.38.1-0.20230824193157-0e8b7cae6ba1
 	knative.dev/hack v0.0.0-20230818155117-9cc05a31e8c0
 	knative.dev/networking v0.0.0-20230822003854-1d7920d27b9e
 	knative.dev/pkg v0.0.0-20230821102121-81e4ee140363
-	knative.dev/serving v0.38.1-0.20230823024257-eaff0b39b99e
+	knative.dev/serving v0.38.1-0.20230824052556-9ac8996b00c8
 	sigs.k8s.io/yaml v1.3.0
 )
 
diff --git a/go.sum b/go.sum
index 6e40ebd75a..8efcfdb763 100644
--- a/go.sum
+++ b/go.sum
@@ -835,16 +835,16 @@ k8s.io/utils v0.0.0-20221108210102-8e77b1f39fe2 h1:GfD9OzL11kvZN5iArC6oTS7RTj7oJ
 k8s.io/utils v0.0.0-20221108210102-8e77b1f39fe2/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
 knative.dev/client-pkg v0.0.0-20230815131440-5abd12981b4b h1:Ln3mDUER89kC4sYHkCpoZVcwthGlMwjekQi2IdMH4vU=
 knative.dev/client-pkg v0.0.0-20230815131440-5abd12981b4b/go.mod h1:GRVZm1rKOy0lpPBGRM1ugK5joDbhXFEvULINHqPoA9U=
-knative.dev/eventing v0.38.1-0.20230822134255-a2e2aa3d515d h1:K8EcKbY3POUZ+D7uekPUqYY7m+Ci3nkYu1+SqpYiwdY=
-knative.dev/eventing v0.38.1-0.20230822134255-a2e2aa3d515d/go.mod h1:InEIckt+XICxXXYy2P4kqEJ4nMDXqI1iCUZ84vGDRbM=
+knative.dev/eventing v0.38.1-0.20230824193157-0e8b7cae6ba1 h1:b3NOrj8vkCdb4cIGlY3UxYdKGs7tQ6g03EgHp4O4SC8=
+knative.dev/eventing v0.38.1-0.20230824193157-0e8b7cae6ba1/go.mod h1:EZV0sqD7yF3Y667OqASDxTNxVuQqZygx2HG7F0oLayk=
 knative.dev/hack v0.0.0-20230818155117-9cc05a31e8c0 h1:n9YEGYuoj31pAkhGlNL+xTQAeXKYTLeMmIZLWA9fAeo=
 knative.dev/hack v0.0.0-20230818155117-9cc05a31e8c0/go.mod h1:yk2OjGDsbEnQjfxdm0/HJKS2WqTLEFg/N6nUs6Rqx3Q=
 knative.dev/networking v0.0.0-20230822003854-1d7920d27b9e h1:9CcYOXJKJSiZ5aeNm0AJZ1DjOlisadZhMSa/O/hOSmE=
 knative.dev/networking v0.0.0-20230822003854-1d7920d27b9e/go.mod h1:1voQlQD0tuot6U3Kldw+uch33mK2LV85fi3MfbV0CP8=
 knative.dev/pkg v0.0.0-20230821102121-81e4ee140363 h1:TI2hMwTM5Bl+yaWu1gN5bXAHSvc+FtH9cqm3NzmDBtY=
 knative.dev/pkg v0.0.0-20230821102121-81e4ee140363/go.mod h1:dA3TdhFTRm4KmmpvfknpGV43SbGNFkLHySjC8/+NczM=
-knative.dev/serving v0.38.1-0.20230823024257-eaff0b39b99e h1:LbHIIoOPcHXDwoJO/5OYqBx46ChN5heEujHiJK71GBc=
-knative.dev/serving v0.38.1-0.20230823024257-eaff0b39b99e/go.mod h1:/q/HksDFhDiPdwOiyFdDE464YF+GjOYL22x7q57NPB0=
+knative.dev/serving v0.38.1-0.20230824052556-9ac8996b00c8 h1:0d9X4aC3ZxTSPKKPOcIzPknVw3F96KHg52uhB+IjWus=
+knative.dev/serving v0.38.1-0.20230824052556-9ac8996b00c8/go.mod h1:/q/HksDFhDiPdwOiyFdDE464YF+GjOYL22x7q57NPB0=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/vendor/knative.dev/serving/test/e2e-common.sh b/vendor/knative.dev/serving/test/e2e-common.sh
index 242d984b69..a458026650 100644
--- a/vendor/knative.dev/serving/test/e2e-common.sh
+++ b/vendor/knative.dev/serving/test/e2e-common.sh
@@ -19,44 +19,44 @@
 source "$(dirname "${BASH_SOURCE[0]}")/../vendor/knative.dev/hack/e2e-tests.sh"
 source "$(dirname "${BASH_SOURCE[0]}")/e2e-networking-library.sh"
 
-export CERT_MANAGER_VERSION="latest"
+export CERT_MANAGER_VERSION=${CERT_MANAGER_VERSION:-"latest"}
 # Since default is istio, make default ingress as istio
 export INGRESS_CLASS=${INGRESS_CLASS:-istio.ingress.networking.knative.dev}
-export ISTIO_VERSION="latest"
-export KOURIER_VERSION=""
-export CONTOUR_VERSION=""
-export GATEWAY_API_VERSION=""
-export CERTIFICATE_CLASS=""
+export ISTIO_VERSION=${ISTIO_VERSION:-"latest"}
+export KOURIER_VERSION=${KOURIER_VERSION:-""}
+export CONTOUR_VERSION=${CONTOUR_VERSION:-""}
+export GATEWAY_API_VERSION=${GATEWAY_API_VERSION:-""}
+export CERTIFICATE_CLASS=${CERTIFICATE_CLASS:-""}
 # Only build linux/amd64 bit images
 export KO_FLAGS="${KO_FLAGS:---platform=linux/amd64}"
 
-export RUN_HTTP01_AUTO_TLS_TESTS=0
-export HTTPS=0
-export SHORT=0
-export ENABLE_HA=0
+export RUN_HTTP01_AUTO_TLS_TESTS=${RUN_HTTP01_AUTO_TLS_TESTS:-0}
+export HTTPS=${HTTPS:-0}
+export SHORT=${SHORT:-0}
+export ENABLE_HA=${ENABLE_HA:-0}
 export ENABLE_TLS=${ENABLE_TLS:-0}
-export MESH=0
+export MESH=${MESH:-0}
 export AMBIENT=${AMBIENT:-0}
-export PERF=0
+export PERF=${PERF:-0}
 export KIND=${KIND:-0}
 export CLUSTER_DOMAIN=${CLUSTER_DOMAIN:-cluster.local}
 
 # List of custom YAMLs to install, if specified (space-separated).
-export INSTALL_CUSTOM_YAMLS=""
-export INSTALL_SERVING_VERSION="HEAD"
-export INSTALL_ISTIO_VERSION="HEAD"
+export INSTALL_CUSTOM_YAMLS=${INSTALL_CUSTOM_YAMLS:-""}
+export INSTALL_SERVING_VERSION=${INSTALL_SERVING_VERSION:-"HEAD"}
+export INSTALL_ISTIO_VERSION=${INSTALL_ISTIO_VERSION:-"HEAD"}
 export YTT_FILES=()
 
 export TMP_DIR="${TMP_DIR:-$(mktemp -d -t ci-$(date +%Y-%m-%d-%H-%M-%S)-XXXXXXXXXX)}"
 
-readonly E2E_YAML_DIR="${TMP_DIR}/e2e-yaml"
+readonly E2E_YAML_DIR=${E2E_YAML_DIR:-"${TMP_DIR}/e2e-yaml"}
 
 # This the namespace used to install Knative Serving. Use generated UUID as namespace.
 export SYSTEM_NAMESPACE="${SYSTEM_NAMESPACE:-$(uuidgen | tr 'A-Z' 'a-z')}"
 
 # Keep this in sync with test/ha/ha.go
-readonly REPLICAS=3
-readonly BUCKETS=10
+readonly REPLICAS=${REPLICAS:-3}
+readonly BUCKETS=${BUCKETS:-10}
 
 export PVC=${PVC:-1}
 export QUOTA=${QUOTA:-1}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index c406507fba..b73956815e 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -941,7 +941,7 @@ k8s.io/utils/trace
 # knative.dev/client-pkg v0.0.0-20230815131440-5abd12981b4b
 ## explicit; go 1.18
 knative.dev/client-pkg/pkg/kn/plugin
-# knative.dev/eventing v0.38.1-0.20230822134255-a2e2aa3d515d
+# knative.dev/eventing v0.38.1-0.20230824193157-0e8b7cae6ba1
 ## explicit; go 1.19
 knative.dev/eventing/pkg/apis/config
 knative.dev/eventing/pkg/apis/duck
@@ -1038,7 +1038,7 @@ knative.dev/pkg/tracing/config
 knative.dev/pkg/tracing/propagation
 knative.dev/pkg/tracing/propagation/tracecontextb3
 knative.dev/pkg/tracker
-# knative.dev/serving v0.38.1-0.20230823024257-eaff0b39b99e
+# knative.dev/serving v0.38.1-0.20230824052556-9ac8996b00c8
 ## explicit; go 1.18
 knative.dev/serving/pkg/apis/autoscaling
 knative.dev/serving/pkg/apis/autoscaling/v1alpha1