diff --git a/go.mod b/go.mod
index 559b307246a..3ff6f8ee029 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,9 @@ module google.golang.org/api
 go 1.19
 
 require (
-	cloud.google.com/go/compute/metadata v0.2.3
+	cloud.google.com/go/auth v0.2.0
+	cloud.google.com/go/auth/oauth2adapt v0.2.0
+	cloud.google.com/go/compute/metadata v0.3.0
 	github.com/google/go-cmp v0.6.0
 	github.com/google/s2a-go v0.1.7
 	github.com/google/uuid v1.6.0
@@ -13,27 +15,25 @@ require (
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0
 	golang.org/x/net v0.22.0
-	golang.org/x/oauth2 v0.18.0
+	golang.org/x/oauth2 v0.19.0
 	golang.org/x/sync v0.6.0
 	golang.org/x/time v0.5.0
 	google.golang.org/genproto/googleapis/bytestream v0.0.0-20240325203815-454cdb8f5daa
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240325203815-454cdb8f5daa
-	google.golang.org/grpc v1.62.1
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240415180920-8c6c420018be
+	google.golang.org/grpc v1.63.0
 	google.golang.org/protobuf v1.33.0
 )
 
 require (
-	cloud.google.com/go/compute v1.23.4 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-logr/logr v1.4.1 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
 	go.opentelemetry.io/otel v1.24.0 // indirect
 	go.opentelemetry.io/otel/metric v1.24.0 // indirect
 	go.opentelemetry.io/otel/trace v1.24.0 // indirect
 	golang.org/x/crypto v0.21.0 // indirect
 	golang.org/x/sys v0.18.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
-	google.golang.org/appengine v1.6.8 // indirect
 )
diff --git a/go.sum b/go.sum
index 6e969a3853e..014208fad14 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,10 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go/compute v1.23.4 h1:EBT9Nw4q3zyE7G45Wvv3MzolIrCJEuHys5muLY0wvAw=
-cloud.google.com/go/compute v1.23.4/go.mod h1:/EJMj55asU6kAFnuZET8zqgwgJ9FvXWXOkkfQZa4ioI=
-cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
-cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
+cloud.google.com/go/auth v0.2.0 h1:y6oTcpMSbOcXbwYgUUrvI+mrQ2xbrcdpPgtVbCGTLTk=
+cloud.google.com/go/auth v0.2.0/go.mod h1:+yb+oy3/P0geX6DLKlqiGHARGR6EX2GRtYCzWOCQSbU=
+cloud.google.com/go/auth/oauth2adapt v0.2.0 h1:FR8zevgQwu+8CqiOT5r6xCmJa3pJC/wdXEEPF1OkNhA=
+cloud.google.com/go/auth/oauth2adapt v0.2.0/go.mod h1:AfqujpDAlTfLfeCIl/HJZZlIxD8+nJoZ5e0x1IxGq5k=
+cloud.google.com/go/compute/metadata v0.3.0 h1:Tz+eQXMEqDIKRsmY3cHTL6FVaynIjX2QxYC4trgAKZc=
+cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
@@ -35,17 +37,14 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
 github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
 github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
-github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
-github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
-github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/s2a-go v0.1.7 h1:60BLSyTrOV4/haCDW4zb1guZItoSq8foHCXrAnjBo/o=
@@ -67,7 +66,6 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
-github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.opencensus.io v0.24.0 h1:y73uSU6J157QMP2kn2r30vwW1A2W2WFwSCGnAVxeaD0=
 go.opencensus.io v0.24.0/go.mod h1:vNK8G9p7aAivkbmorf4v+7Hgx+Zs0yY+0fOtgBfjQKo=
 go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 h1:4Pp6oUg3+e/6M4C0A/3kJ2VYa++dsWVTtGgLVj5xtHg=
@@ -82,50 +80,36 @@ go.opentelemetry.io/otel/trace v1.24.0 h1:CsKnnL4dUAr/0llH9FKuc698G04IrpWV0MQA/Y
 go.opentelemetry.io/otel/trace v1.24.0/go.mod h1:HPc3Xr/cOApsBI154IU0OI0HJexz+aw5uPdbs3UCjNU=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.21.0 h1:X31++rzVUdKhX5sWmSOFZxx8UW/ldWx55cbf08iNAMA=
 golang.org/x/crypto v0.21.0/go.mod h1:0BP7YvVV9gBbVKyeTG0Gyn+gZm94bibOW5BjDEYAOMs=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
-golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.22.0 h1:9sGLhx7iRIHEiX0oAJ3MRZMUCElJgy7Br1nO+AMN3Tc=
 golang.org/x/net v0.22.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
-golang.org/x/oauth2 v0.18.0 h1:09qnuIAgzdx1XplqJvW6CQqMCtGZykZWcXzPMPUusvI=
-golang.org/x/oauth2 v0.18.0/go.mod h1:Wf7knwG0MPoWIMMBgFlEaSUDaKskp0dCfrlJRJXbBi8=
+golang.org/x/oauth2 v0.19.0 h1:9+E/EZBCbTLNrbN35fHv/a/d/mOBatymz1zbtQrXpIg=
+golang.org/x/oauth2 v0.19.0/go.mod h1:vYi7skDa1x015PmRRYZ7+s1cWyPgrPiSYRe4rnsexc8=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
 golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
 golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
 golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/time v0.5.0 h1:o7cqy6amK/52YcAKIPlM3a+Fpj35zvRj2TP+e1xFSfk=
@@ -135,30 +119,25 @@ golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
-google.golang.org/appengine v1.6.8 h1:IhEN5q69dyKagZPYMSdIjS2HqprW324FRQZJcGqPAsM=
-google.golang.org/appengine v1.6.8/go.mod h1:1jJ3jBArFh5pcgW8gCtRJnepW8FzD1V44FJffLiz/Ds=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
-google.golang.org/genproto v0.0.0-20240123012728-ef4313101c80 h1:KAeGQVN3M9nD0/bQXnr/ClcEMJ968gUXJQ9pwfSynuQ=
+google.golang.org/genproto v0.0.0-20240227224415-6ceb2ff114de h1:F6qOa9AZTYJXOUEr4jDysRDLrm4PHePlge4v4TGAlxY=
 google.golang.org/genproto/googleapis/api v0.0.0-20240311132316-a219d84964c2 h1:rIo7ocm2roD9DcFIX67Ym8icoGCKSARAiPljFhh5suQ=
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-google.golang.org/grpc v1.62.1/go.mod h1:IWTG0VlJLCh1SkC58F7np9ka9mx/WNkjl4PGJaiq+QE=
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@@ -168,8 +147,6 @@ google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
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-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
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diff --git a/go.work.sum b/go.work.sum
index 296b9c1e877..7da640a9548 100644
--- a/go.work.sum
+++ b/go.work.sum
@@ -1,27 +1,189 @@
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 go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.47.0/go.mod h1:SK2UL73Zy1quvRPonmOmRDiWk1KBV3LyIeeIxcEApWw=
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 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
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 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
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+google.golang.org/grpc v1.61.0/go.mod h1:VUbo7IFqmF1QtCAstipjG0GIoq49KvMe9+h1jFLBNJs=
+google.golang.org/grpc v1.61.1/go.mod h1:VUbo7IFqmF1QtCAstipjG0GIoq49KvMe9+h1jFLBNJs=
+google.golang.org/grpc v1.62.0/go.mod h1:IWTG0VlJLCh1SkC58F7np9ka9mx/WNkjl4PGJaiq+QE=
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diff --git a/idtoken/idtoken.go b/idtoken/idtoken.go
index bd29a95a3c3..477164f904b 100644
--- a/idtoken/idtoken.go
+++ b/idtoken/idtoken.go
@@ -16,6 +16,8 @@ import (
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 
+	newidtoken "cloud.google.com/go/auth/credentials/idtoken"
+	"cloud.google.com/go/auth/oauth2adapt"
 	"google.golang.org/api/impersonate"
 	"google.golang.org/api/internal"
 	"google.golang.org/api/option"
@@ -95,9 +97,29 @@ func NewTokenSource(ctx context.Context, audience string, opts ...ClientOption)
 	if ds.ImpersonationConfig != nil {
 		return nil, fmt.Errorf("idtoken: option.WithImpersonatedCredentials not supported")
 	}
+	if ds.IsNewAuthLibraryEnabled() {
+		return newTokenSourceNewAuth(ctx, audience, &ds)
+	}
 	return newTokenSource(ctx, audience, &ds)
 }
 
+func newTokenSourceNewAuth(ctx context.Context, audience string, ds *internal.DialSettings) (oauth2.TokenSource, error) {
+	if ds.AuthCredentials != nil {
+		return nil, fmt.Errorf("idtoken: option.WithTokenProvider not supported")
+	}
+	creds, err := newidtoken.NewCredentials(&newidtoken.Options{
+		Audience:        audience,
+		CustomClaims:    ds.CustomClaims,
+		CredentialsFile: ds.CredentialsFile,
+		CredentialsJSON: ds.CredentialsJSON,
+		Client:          oauth2.NewClient(ctx, nil),
+	})
+	if err != nil {
+		return nil, err
+	}
+	return oauth2adapt.TokenSourceFromTokenProvider(creds), nil
+}
+
 func newTokenSource(ctx context.Context, audience string, ds *internal.DialSettings) (oauth2.TokenSource, error) {
 	creds, err := internal.Creds(ctx, ds)
 	if err != nil {
diff --git a/internal/creds.go b/internal/creds.go
index b6489309851..6ffdd820fae 100644
--- a/internal/creds.go
+++ b/internal/creds.go
@@ -15,6 +15,8 @@ import (
 	"os"
 	"time"
 
+	"cloud.google.com/go/auth/credentials"
+	"cloud.google.com/go/auth/oauth2adapt"
 	"golang.org/x/oauth2"
 	"google.golang.org/api/internal/cert"
 	"google.golang.org/api/internal/impersonate"
@@ -27,6 +29,9 @@ const quotaProjectEnvVar = "GOOGLE_CLOUD_QUOTA_PROJECT"
 // Creds returns credential information obtained from DialSettings, or if none, then
 // it returns default credential information.
 func Creds(ctx context.Context, ds *DialSettings) (*google.Credentials, error) {
+	if ds.IsNewAuthLibraryEnabled() {
+		return credsNewAuth(ctx, ds)
+	}
 	creds, err := baseCreds(ctx, ds)
 	if err != nil {
 		return nil, err
@@ -37,6 +42,55 @@ func Creds(ctx context.Context, ds *DialSettings) (*google.Credentials, error) {
 	return creds, nil
 }
 
+func credsNewAuth(ctx context.Context, settings *DialSettings) (*google.Credentials, error) {
+	// Preserve old options behavior
+	if settings.InternalCredentials != nil {
+		return settings.InternalCredentials, nil
+	} else if settings.Credentials != nil {
+		return settings.Credentials, nil
+	} else if settings.TokenSource != nil {
+		return &google.Credentials{TokenSource: settings.TokenSource}, nil
+	}
+
+	if settings.AuthCredentials != nil {
+		return oauth2adapt.Oauth2CredentialsFromAuthCredentials(settings.AuthCredentials), nil
+	}
+
+	var useSelfSignedJWT bool
+	var aud string
+	var scopes []string
+	// If scoped JWTs are enabled user provided an aud, allow self-signed JWT.
+	if settings.EnableJwtWithScope || len(settings.Audiences) > 0 {
+		useSelfSignedJWT = true
+	}
+
+	if len(settings.Audiences) > 0 {
+		aud = settings.Audiences[0]
+	}
+	// Only default scopes if user did not also set an audience.
+	if len(settings.Scopes) == 0 && aud == "" && len(settings.DefaultScopes) > 0 {
+		scopes = make([]string, len(scopes))
+		copy(scopes, settings.DefaultScopes)
+	}
+	if len(scopes) == 0 && aud == "" {
+		aud = settings.DefaultAudience
+	}
+
+	creds, err := credentials.DetectDefault(&credentials.DetectOptions{
+		Scopes:           scopes,
+		Audience:         aud,
+		CredentialsFile:  settings.CredentialsFile,
+		CredentialsJSON:  settings.CredentialsJSON,
+		UseSelfSignedJWT: useSelfSignedJWT,
+		Client:           oauth2.NewClient(ctx, nil),
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return oauth2adapt.Oauth2CredentialsFromAuthCredentials(creds), nil
+}
+
 func baseCreds(ctx context.Context, ds *DialSettings) (*google.Credentials, error) {
 	if ds.InternalCredentials != nil {
 		return ds.InternalCredentials, nil
diff --git a/internal/creds_test.go b/internal/creds_test.go
index 60b330034d3..d57ccca68e9 100644
--- a/internal/creds_test.go
+++ b/internal/creds_test.go
@@ -9,49 +9,10 @@ import (
 	"os"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
-	"github.com/google/go-cmp/cmp/cmpopts"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 )
 
-type dummyTokenSource struct {
-	oauth2.TokenSource
-}
-
-func TestTokenSource(t *testing.T) {
-	ctx := context.Background()
-
-	// Pass in a TokenSource, get it back.
-	ts := &dummyTokenSource{}
-	ds := &DialSettings{TokenSource: ts}
-	got, err := Creds(ctx, ds)
-	if err != nil {
-		t.Fatal(err)
-	}
-	want := &google.DefaultCredentials{TokenSource: ts}
-	if !cmp.Equal(got, want, cmpopts.IgnoreFields(google.Credentials{}, "udMu", "universeDomain")) {
-		t.Error("did not get the same TokenSource back")
-	}
-
-	// If both a file and TokenSource are passed, the file takes precedence
-	// (existing behavior).
-	// TODO(jba): make this an error?
-	ds = &DialSettings{
-		TokenSource:     ts,
-		CredentialsFile: "testdata/service-account.json",
-		DefaultScopes:   []string{"foo"},
-	}
-	got, err = Creds(ctx, ds)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if cmp.Equal(got, want, cmpopts.IgnoreFields(google.Credentials{}, "udMu", "universeDomain")) {
-		t.Error("got the same TokenSource back, wanted one from the JSON file")
-	}
-	// TODO(jba): find a way to test the call to google.DefaultTokenSource.
-}
-
 func TestDefaultServiceAccount(t *testing.T) {
 	ctx := context.Background()
 
diff --git a/internal/kokoro/test.sh b/internal/kokoro/test.sh
index 25005398e77..28d40011048 100755
--- a/internal/kokoro/test.sh
+++ b/internal/kokoro/test.sh
@@ -20,6 +20,7 @@ export GCLOUD_TESTS_GOLANG_AWS_ROLE_ID="arn:aws:iam::$GCLOUD_TESTS_GOLANG_AWS_AC
 export GCLOUD_TESTS_GOLANG_AUDIENCE_OIDC=$(cat ${KOKORO_GFILE_DIR}/secret_manager/go-cloud-integration-byoid-aud-oidc)
 export GCLOUD_TESTS_GOLANG_AUDIENCE_AWS=$(cat ${KOKORO_GFILE_DIR}/secret_manager/go-cloud-integration-byoid-aud-aws)
 export GOOGLE_EXTERNAL_ACCOUNT_ALLOW_EXECUTABLES="1"
+export GOOGLE_API_GO_EXPERIMENTAL_ENABLE_NEW_AUTH_LIB="true"
 
 # Display commands being run
 set -x
diff --git a/internal/settings.go b/internal/settings.go
index 0415386f676..6d0c18e5a87 100644
--- a/internal/settings.go
+++ b/internal/settings.go
@@ -13,6 +13,7 @@ import (
 	"strconv"
 	"time"
 
+	"cloud.google.com/go/auth"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 	"google.golang.org/api/internal/impersonate"
@@ -20,9 +21,10 @@ import (
 )
 
 const (
-	newAuthLibEnvVar      = "GOOGLE_API_GO_EXPERIMENTAL_USE_NEW_AUTH_LIB"
-	universeDomainEnvVar  = "GOOGLE_CLOUD_UNIVERSE_DOMAIN"
-	defaultUniverseDomain = "googleapis.com"
+	newAuthLibEnvVar        = "GOOGLE_API_GO_EXPERIMENTAL_ENABLE_NEW_AUTH_LIB"
+	newAuthLibDisabledEnVar = "GOOGLE_API_GO_EXPERIMENTAL_DISABLE_NEW_AUTH_LIB"
+	universeDomainEnvVar    = "GOOGLE_CLOUD_UNIVERSE_DOMAIN"
+	defaultUniverseDomain   = "googleapis.com"
 )
 
 // DialSettings holds information needed to establish a connection with a
@@ -57,7 +59,6 @@ type DialSettings struct {
 	ImpersonationConfig           *impersonate.Config
 	EnableDirectPath              bool
 	EnableDirectPathXds           bool
-	EnableNewAuthLibrary          bool
 	AllowNonDefaultServiceAccount bool
 	DefaultUniverseDomain         string
 	UniverseDomain                string
@@ -65,6 +66,10 @@ type DialSettings struct {
 	// https://cloud.google.com/apis/docs/system-parameters
 	QuotaProject  string
 	RequestReason string
+
+	// New Auth library Options
+	AuthCredentials      *auth.Credentials
+	EnableNewAuthLibrary bool
 }
 
 // GetScopes returns the user-provided scopes, if set, or else falls back to the
@@ -91,6 +96,11 @@ func (ds *DialSettings) HasCustomAudience() bool {
 
 // IsNewAuthLibraryEnabled returns true if the new auth library should be used.
 func (ds *DialSettings) IsNewAuthLibraryEnabled() bool {
+	// Disabled env is for future rollouts to make sure there is a way to easily
+	// disable this behaviour once we switch in on by default.
+	if b, err := strconv.ParseBool(os.Getenv(newAuthLibDisabledEnVar)); err == nil && b {
+		return false
+	}
 	if ds.EnableNewAuthLibrary {
 		return true
 	}
diff --git a/option/option.go b/option/option.go
index c882c1eb482..23aba01b628 100644
--- a/option/option.go
+++ b/option/option.go
@@ -9,6 +9,7 @@ import (
 	"crypto/tls"
 	"net/http"
 
+	"cloud.google.com/go/auth"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 	"google.golang.org/api/internal"
@@ -344,6 +345,19 @@ func WithCredentials(creds *google.Credentials) ClientOption {
 	return (*withCreds)(creds)
 }
 
+// WithAuthCredentials returns a ClientOption that specifies an
+// [cloud.google.com/go/auth.Credentials] to be used as the basis for
+// authentication.
+func WithAuthCredentials(creds *auth.Credentials) ClientOption {
+	return withAuthCredentials{creds}
+}
+
+type withAuthCredentials struct{ creds *auth.Credentials }
+
+func (w withAuthCredentials) Apply(o *internal.DialSettings) {
+	o.AuthCredentials = w.creds
+}
+
 // WithUniverseDomain returns a ClientOption that sets the universe domain.
 //
 // This is an EXPERIMENTAL API and may be changed or removed in the future.
diff --git a/transport/grpc/dial.go b/transport/grpc/dial.go
index bfc55594efb..8d4cf2c7114 100644
--- a/transport/grpc/dial.go
+++ b/transport/grpc/dial.go
@@ -17,6 +17,10 @@ import (
 	"sync"
 	"time"
 
+	"cloud.google.com/go/auth"
+	"cloud.google.com/go/auth/credentials"
+	"cloud.google.com/go/auth/grpctransport"
+	"cloud.google.com/go/auth/oauth2adapt"
 	"cloud.google.com/go/compute/metadata"
 	"go.opencensus.io/plugin/ocgrpc"
 	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
@@ -79,6 +83,13 @@ func Dial(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, e
 	if o.GRPCConnPool != nil {
 		return o.GRPCConnPool.Conn(), nil
 	}
+	if o.IsNewAuthLibraryEnabled() {
+		pool, err := dialPoolNewAuth(ctx, true, 1, o)
+		if err != nil {
+			return nil, err
+		}
+		return pool.Connection(), nil
+	}
 	// NOTE(cbro): We removed support for option.WithGRPCConnPool (GRPCConnPoolSize)
 	// on 2020-02-12 because RoundRobin and WithBalancer are deprecated and we need to remove usages of it.
 	//
@@ -94,6 +105,13 @@ func DialInsecure(ctx context.Context, opts ...option.ClientOption) (*grpc.Clien
 	if err != nil {
 		return nil, err
 	}
+	if o.IsNewAuthLibraryEnabled() {
+		pool, err := dialPoolNewAuth(ctx, false, 1, o)
+		if err != nil {
+			return nil, err
+		}
+		return pool.Connection(), nil
+	}
 	return dial(ctx, true, o)
 }
 
@@ -112,6 +130,18 @@ func DialPool(ctx context.Context, opts ...option.ClientOption) (ConnPool, error
 	if o.GRPCConnPool != nil {
 		return o.GRPCConnPool, nil
 	}
+
+	if o.IsNewAuthLibraryEnabled() {
+		if o.GRPCConn != nil {
+			return &singleConnPool{o.GRPCConn}, nil
+		}
+		pool, err := dialPoolNewAuth(ctx, true, o.GRPCConnPoolSize, o)
+		if err != nil {
+			return nil, err
+		}
+		return &poolAdapter{pool}, nil
+	}
+
 	poolSize := o.GRPCConnPoolSize
 	if o.GRPCConn != nil {
 		// WithGRPCConn is technically incompatible with WithGRPCConnectionPool.
@@ -141,6 +171,66 @@ func DialPool(ctx context.Context, opts ...option.ClientOption) (ConnPool, error
 	return pool, nil
 }
 
+// dialPoolNewAuth is an adapter to call new auth library.
+func dialPoolNewAuth(ctx context.Context, secure bool, poolSize int, ds *internal.DialSettings) (grpctransport.GRPCClientConnPool, error) {
+	// honor options if set
+	var ts oauth2.TokenSource
+	if ds.InternalCredentials != nil {
+		ts = ds.InternalCredentials.TokenSource
+	} else if ds.Credentials != nil {
+		ts = ds.Credentials.TokenSource
+	} else if ds.TokenSource != nil {
+		ts = ds.TokenSource
+	}
+	var creds *auth.Credentials
+	if ds.AuthCredentials != nil {
+		creds = ds.AuthCredentials
+	} else if ts != nil {
+		creds = auth.NewCredentials(&auth.CredentialsOptions{
+			TokenProvider: oauth2adapt.TokenProviderFromTokenSource(ts),
+		})
+	}
+
+	var aud string
+	if len(ds.Audiences) > 0 {
+		aud = ds.Audiences[0]
+	}
+	metadata := map[string]string{}
+	if ds.QuotaProject != "" {
+		metadata["X-goog-user-project"] = ds.QuotaProject
+	}
+	if ds.RequestReason != "" {
+		metadata["X-goog-request-reason"] = ds.RequestReason
+	}
+	pool, err := grpctransport.Dial(ctx, secure, &grpctransport.Options{
+		DisableTelemetry:      ds.TelemetryDisabled,
+		DisableAuthentication: ds.NoAuth,
+		Endpoint:              ds.Endpoint,
+		Metadata:              metadata,
+		GRPCDialOpts:          ds.GRPCDialOpts,
+		PoolSize:              poolSize,
+		Credentials:           creds,
+		DetectOpts: &credentials.DetectOptions{
+			Scopes:          ds.Scopes,
+			Audience:        aud,
+			CredentialsFile: ds.CredentialsFile,
+			CredentialsJSON: ds.CredentialsJSON,
+			Client:          oauth2.NewClient(ctx, nil),
+		},
+		InternalOptions: &grpctransport.InternalOptions{
+			EnableNonDefaultSAForDirectPath: ds.AllowNonDefaultServiceAccount,
+			EnableDirectPath:                ds.EnableDirectPath,
+			EnableDirectPathXds:             ds.EnableDirectPathXds,
+			EnableJWTWithScope:              ds.EnableJwtWithScope,
+			DefaultAudience:                 ds.DefaultAudience,
+			DefaultEndpointTemplate:         ds.DefaultEndpointTemplate,
+			DefaultMTLSEndpoint:             ds.DefaultMTLSEndpoint,
+			DefaultScopes:                   ds.DefaultScopes,
+		},
+	})
+	return pool, err
+}
+
 func dial(ctx context.Context, insecure bool, o *internal.DialSettings) (*grpc.ClientConn, error) {
 	if o.HTTPClient != nil {
 		return nil, errors.New("unsupported HTTP client specified")
diff --git a/transport/grpc/pool.go b/transport/grpc/pool.go
index 4cf94a2771e..4369fca13e4 100644
--- a/transport/grpc/pool.go
+++ b/transport/grpc/pool.go
@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"sync/atomic"
 
+	"cloud.google.com/go/auth/grpctransport"
 	"google.golang.org/api/internal"
 	"google.golang.org/grpc"
 )
@@ -90,3 +91,27 @@ func (m multiError) Error() string {
 	}
 	return fmt.Sprintf("%s (and %d other errors)", s, n-1)
 }
+
+type poolAdapter struct {
+	pool grpctransport.GRPCClientConnPool
+}
+
+func (p *poolAdapter) Conn() *grpc.ClientConn {
+	return p.pool.Connection()
+}
+
+func (p *poolAdapter) Num() int {
+	return p.pool.Len()
+}
+
+func (p *poolAdapter) Close() error {
+	return p.pool.Close()
+}
+
+func (p *poolAdapter) Invoke(ctx context.Context, method string, args interface{}, reply interface{}, opts ...grpc.CallOption) error {
+	return p.Conn().Invoke(ctx, method, args, reply, opts...)
+}
+
+func (p *poolAdapter) NewStream(ctx context.Context, desc *grpc.StreamDesc, method string, opts ...grpc.CallOption) (grpc.ClientStream, error) {
+	return p.Conn().NewStream(ctx, desc, method, opts...)
+}
diff --git a/transport/http/dial.go b/transport/http/dial.go
index c4f5e0b1380..2f708008c77 100644
--- a/transport/http/dial.go
+++ b/transport/http/dial.go
@@ -15,6 +15,10 @@ import (
 	"net/http"
 	"time"
 
+	"cloud.google.com/go/auth"
+	"cloud.google.com/go/auth/credentials"
+	"cloud.google.com/go/auth/httptransport"
+	"cloud.google.com/go/auth/oauth2adapt"
 	"go.opencensus.io/plugin/ochttp"
 	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 	"golang.org/x/net/http2"
@@ -43,6 +47,13 @@ func NewClient(ctx context.Context, opts ...option.ClientOption) (*http.Client,
 		return settings.HTTPClient, endpoint, nil
 	}
 
+	if settings.IsNewAuthLibraryEnabled() {
+		client, err := newClientNewAuth(ctx, settings)
+		if err != nil {
+			return nil, "", err
+		}
+		return client, endpoint, nil
+	}
 	trans, err := newTransport(ctx, defaultBaseTransport(ctx, clientCertSource, dialTLSContext), settings)
 	if err != nil {
 		return nil, "", err
@@ -50,6 +61,66 @@ func NewClient(ctx context.Context, opts ...option.ClientOption) (*http.Client,
 	return &http.Client{Transport: trans}, endpoint, nil
 }
 
+// newClientNewAuth is an adapter to call new auth library.
+func newClientNewAuth(ctx context.Context, settings *internal.DialSettings) (*http.Client, error) {
+	// honor options if set
+	var ts oauth2.TokenSource
+	if settings.InternalCredentials != nil {
+		ts = settings.InternalCredentials.TokenSource
+	} else if settings.Credentials != nil {
+		ts = settings.Credentials.TokenSource
+	} else if settings.TokenSource != nil {
+		ts = settings.TokenSource
+	}
+	var creds *auth.Credentials
+	if settings.AuthCredentials != nil {
+		creds = settings.AuthCredentials
+	} else if ts != nil {
+		creds = auth.NewCredentials(&auth.CredentialsOptions{
+			TokenProvider: oauth2adapt.TokenProviderFromTokenSource(ts),
+		})
+	}
+
+	var aud string
+	if len(settings.Audiences) > 0 {
+		aud = settings.Audiences[0]
+	}
+	headers := http.Header{}
+	if settings.QuotaProject != "" {
+		headers.Set("X-goog-user-project", settings.QuotaProject)
+	}
+	if settings.RequestReason != "" {
+		headers.Set("X-goog-request-reason", settings.RequestReason)
+	}
+	client, err := httptransport.NewClient(&httptransport.Options{
+		DisableTelemetry:      settings.TelemetryDisabled,
+		DisableAuthentication: settings.NoAuth,
+		Headers:               headers,
+		Endpoint:              settings.Endpoint,
+		APIKey:                settings.APIKey,
+		Credentials:           creds,
+		ClientCertProvider:    settings.ClientCertSource,
+		DetectOpts: &credentials.DetectOptions{
+			Scopes:          settings.Scopes,
+			Audience:        aud,
+			CredentialsFile: settings.CredentialsFile,
+			CredentialsJSON: settings.CredentialsJSON,
+			Client:          oauth2.NewClient(ctx, nil),
+		},
+		InternalOptions: &httptransport.InternalOptions{
+			EnableJWTWithScope:      settings.EnableJwtWithScope,
+			DefaultAudience:         settings.DefaultAudience,
+			DefaultEndpointTemplate: settings.DefaultEndpointTemplate,
+			DefaultMTLSEndpoint:     settings.DefaultMTLSEndpoint,
+			DefaultScopes:           settings.DefaultScopes,
+		},
+	})
+	if err != nil {
+		return nil, err
+	}
+	return client, nil
+}
+
 // NewTransport creates an http.RoundTripper for use communicating with a Google
 // cloud service, configured with the given ClientOptions. Its RoundTrip method delegates to base.
 func NewTransport(ctx context.Context, base http.RoundTripper, opts ...option.ClientOption) (http.RoundTripper, error) {
@@ -60,6 +131,14 @@ func NewTransport(ctx context.Context, base http.RoundTripper, opts ...option.Cl
 	if settings.HTTPClient != nil {
 		return nil, errors.New("transport/http: WithHTTPClient passed to NewTransport")
 	}
+	if settings.IsNewAuthLibraryEnabled() {
+		// TODO, this is not wrapping the base, find a way...
+		client, err := newClientNewAuth(ctx, settings)
+		if err != nil {
+			return nil, err
+		}
+		return client.Transport, nil
+	}
 	return newTransport(ctx, base, settings)
 }
 
diff --git a/transport/http/dial_test.go b/transport/http/dial_test.go
index 8f96404b95f..ccf299f4182 100644
--- a/transport/http/dial_test.go
+++ b/transport/http/dial_test.go
@@ -10,7 +10,6 @@ import (
 	"strings"
 	"testing"
 
-	"go.opencensus.io/plugin/ochttp"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 	"google.golang.org/api/option"
@@ -28,21 +27,13 @@ func TestNewClient(t *testing.T) {
 	if endpoint != "" {
 		t.Errorf("got: %s, want: ''", endpoint)
 	}
-	if got, want := fmt.Sprintf("%T", client.Transport), "*oauth2.Transport"; got != want {
-		t.Fatalf("got %s, want: %s", got, want)
-	}
-	t1 := client.Transport.(*oauth2.Transport)
-	if got, want := fmt.Sprintf("%T", t1.Base), "*ochttp.Transport"; got != want {
-		t.Fatalf("got %s, want: %s", got, want)
-	}
-	t2 := t1.Base.(*ochttp.Transport)
-	if got, want := fmt.Sprintf("%T", t2.Base), "*otelhttp.Transport"; got != want {
+	if got, want := fmt.Sprintf("%T", client.Transport), "*httptransport.authTransport"; got != want {
 		t.Fatalf("got %s, want: %s", got, want)
 	}
 }
 
 func TestNewClient_MismatchedUniverseChecks(t *testing.T) {
-
+	t.Setenv("GOOGLE_API_GO_EXPERIMENTAL_DISABLE_NEW_AUTH_LIB", "true")
 	rootTokenScope := "https://www.googleapis.com/auth/cloud-platform"
 	otherUniverse := "example.com"
 	defaultUniverse := "googleapis.com"