diff --git a/vendor/google.golang.org/grpc/vet.sh b/vendor/google.golang.org/grpc/vet.sh
old mode 100755
new mode 100644
index 661e1e1..f324be5
--- a/vendor/google.golang.org/grpc/vet.sh
+++ b/vendor/google.golang.org/grpc/vet.sh
@@ -31,12 +31,15 @@
 if [[ "$1" = "-install" ]]; then
   # Check for module support
   if go help mod >& /dev/null; then
+    # Install the pinned versions as defined in module tools.
+    pushd ./test/tools
     go install \
       golang.org/x/lint/golint \
       golang.org/x/tools/cmd/goimports \
       honnef.co/go/tools/cmd/staticcheck \
       github.com/client9/misspell/cmd/misspell \
       github.com/golang/protobuf/protoc-gen-go
+    popd
   else
     # Ye olde `go get` incantation.
     # Note: this gets the latest version of all tools (vs. the pinned versions
@@ -67,18 +70,21 @@
 fi
 
 # - Ensure all source files contain a copyright message.
-git ls-files "*.go" | xargs grep -L "\(Copyright [0-9]\{4,\} gRPC authors\)\|DO NOT EDIT" 2>&1 | fail_on_output
+(! git grep -L "\(Copyright [0-9]\{4,\} gRPC authors\)\|DO NOT EDIT" -- '*.go')
 
 # - Make sure all tests in grpc and grpc/test use leakcheck via Teardown.
 (! grep 'func Test[^(]' *_test.go)
 (! grep 'func Test[^(]' test/*.go)
 
+# - Do not import x/net/context.
+(! git grep -l 'x/net/context' -- "*.go")
+
 # - Do not import math/rand for real library code.  Use internal/grpcrand for
 #   thread safety.
-git ls-files "*.go" | xargs grep -l '"math/rand"' 2>&1 | (! grep -v '^examples\|^stress\|grpcrand\|wrr_test')
+git grep -l '"math/rand"' -- "*.go" 2>&1 | (! grep -v '^examples\|^stress\|grpcrand\|wrr_test')
 
 # - Ensure all ptypes proto packages are renamed when importing.
-git ls-files "*.go" | (! xargs grep "\(import \|^\s*\)\"github.com/golang/protobuf/ptypes/")
+(! git grep "\(import \|^\s*\)\"github.com/golang/protobuf/ptypes/" -- "*.go")
 
 # - Check imports that are illegal in appengine (until Go 1.11).
 # TODO: Remove when we drop Go 1.10 support
@@ -86,7 +92,7 @@
 
 # - gofmt, goimports, golint (with exceptions for generated code), go vet.
 gofmt -s -d -l . 2>&1 | fail_on_output
-goimports -l . 2>&1 | (! grep -vE "(_mock|\.pb)\.go:") | fail_on_output
+goimports -l . 2>&1 | (! grep -vE "(_mock|\.pb)\.go") | fail_on_output
 golint ./... 2>&1 | (! grep -vE "(_mock|\.pb)\.go:")
 go vet -all .
 
@@ -109,8 +115,10 @@
 staticcheck -go 1.9 -checks 'inherit,-ST1015' -ignore '
 google.golang.org/grpc/balancer.go:SA1019
 google.golang.org/grpc/balancer/grpclb/grpclb_remote_balancer.go:SA1019
+google.golang.org/grpc/balancer/grpclb/grpclb_test.go:SA1019
 google.golang.org/grpc/balancer/roundrobin/roundrobin_test.go:SA1019
 google.golang.org/grpc/xds/internal/balancer/edsbalancer/balancergroup.go:SA1019
+google.golang.org/grpc/xds/internal/resolver/xds_resolver.go:SA1019
 google.golang.org/grpc/xds/internal/balancer/xds.go:SA1019
 google.golang.org/grpc/xds/internal/balancer/xds_client.go:SA1019
 google.golang.org/grpc/balancer_conn_wrappers.go:SA1019
@@ -124,7 +132,7 @@
 google.golang.org/grpc/examples/features/load_balancing/client/main.go:SA1019
 google.golang.org/grpc/internal/transport/handler_server.go:SA1019
 google.golang.org/grpc/internal/transport/handler_server_test.go:SA1019
-google.golang.org/grpc/resolver/dns/dns_resolver.go:SA1019
+google.golang.org/grpc/internal/resolver/dns/dns_resolver.go:SA1019
 google.golang.org/grpc/stats/stats_test.go:SA1019
 google.golang.org/grpc/test/balancer_test.go:SA1019
 google.golang.org/grpc/test/channelz_test.go:SA1019