diff --git a/go.mod b/go.mod
index 7932746fa..7097f9499 100644
--- a/go.mod
+++ b/go.mod
@@ -30,7 +30,7 @@ require (
 	gopkg.in/go-playground/webhooks.v3 v3.13.0
 	gopkg.in/yaml.v2 v2.3.0
 	honnef.co/go/tools v0.0.1-2020.1.5 // indirect
-	knative.dev/hack v0.0.0-20210426064739-88c69cd1eca7
+	knative.dev/hack v0.0.0-20210428122153-93ad9129c268
 )
 
 replace go.opencensus.io => go.opencensus.io v0.20.2
diff --git a/go.sum b/go.sum
index c18ae698d..d019e825a 100644
--- a/go.sum
+++ b/go.sum
@@ -539,8 +539,8 @@ honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.5 h1:nI5egYTGJakVyOryqLs1cQO5dO0ksin5XXs2pspk75k=
 honnef.co/go/tools v0.0.1-2020.1.5/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-knative.dev/hack v0.0.0-20210426064739-88c69cd1eca7 h1:Z5icQ2KNCDSzTcHWMGI3KzdK/BpmgkGYdTX0RRzZul0=
-knative.dev/hack v0.0.0-20210426064739-88c69cd1eca7/go.mod h1:PHt8x8yX5Z9pPquBEfIj0X66f8iWkWfR0S/sarACJrI=
+knative.dev/hack v0.0.0-20210428122153-93ad9129c268 h1:lBIj9Epd9UQ55NEaHzAdY/UZbuaegCdGPKVC2+Z68Q0=
+knative.dev/hack v0.0.0-20210428122153-93ad9129c268/go.mod h1:PHt8x8yX5Z9pPquBEfIj0X66f8iWkWfR0S/sarACJrI=
 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/hack/codegen-library.sh b/vendor/knative.dev/hack/codegen-library.sh
index 062b90499..ae5130f32 100644
--- a/vendor/knative.dev/hack/codegen-library.sh
+++ b/vendor/knative.dev/hack/codegen-library.sh
@@ -29,7 +29,7 @@ export GOPATH=$(go_mod_gopath_hack)
 export GOBIN=${GOPATH}/bin # Set GOBIN explicitly as deepcopy-gen is installed by go install.
 export MODULE_NAME=$(go_mod_module_name)
 export CODEGEN_PKG=${CODEGEN_PKG:-$(cd ${REPO_ROOT_DIR}; ls -d -1 ./vendor/k8s.io/code-generator 2>/dev/null || echo ../code-generator)}
-export KNATIVE_CODEGEN_PKG=${KNATIVE_CODEGEN_PKG:-$(cd ${REPO_ROOT_DIR}; ls -d -1 ./vendor/knative.dev/pkg 2>/dev/null || echo ../pkg)}
+export KNATIVE_CODEGEN_PKG=${KNATIVE_CODEGEN_PKG:-$(cd ${REPO_ROOT_DIR}; ls -d -1 ./vendor/knative.dev/pkg 2>/dev/null || echo "${REPO_ROOT_DIR}")}
 
 chmod +x ${CODEGEN_PKG}/generate-groups.sh
 chmod +x ${KNATIVE_CODEGEN_PKG}/hack/generate-knative.sh
diff --git a/vendor/knative.dev/hack/presubmit-tests.sh b/vendor/knative.dev/hack/presubmit-tests.sh
index fb50ac819..f3f7738b6 100644
--- a/vendor/knative.dev/hack/presubmit-tests.sh
+++ b/vendor/knative.dev/hack/presubmit-tests.sh
@@ -296,6 +296,15 @@ function main() {
       echo ">> docker version"
       docker version
     fi
+    if type java > /dev/null; then
+      echo ">> java version"
+      java -version
+      echo "JAVA_HOME: $JAVA_HOME"
+    fi
+    if type mvn > /dev/null; then
+      echo ">> maven version"
+      mvn --version
+    fi
   fi
 
   [[ -z $1 ]] && set -- "--all-tests"
diff --git a/vendor/modules.txt b/vendor/modules.txt
index dcd40f84b..6113fd14d 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -286,7 +286,7 @@ gopkg.in/go-playground/webhooks.v3/github
 gopkg.in/yaml.v2
 # honnef.co/go/tools v0.0.1-2020.1.5
 ## explicit
-# knative.dev/hack v0.0.0-20210426064739-88c69cd1eca7
+# knative.dev/hack v0.0.0-20210428122153-93ad9129c268
 ## explicit
 knative.dev/hack
 # go.opencensus.io => go.opencensus.io v0.20.2