diff --git a/sdk/auth/oauth/oauth_test.go b/sdk/auth/oauth/oauth_test.go
index 8c55bccd25..d2baf7cb61 100644
--- a/sdk/auth/oauth/oauth_test.go
+++ b/sdk/auth/oauth/oauth_test.go
@@ -67,7 +67,7 @@ func (s *OAuthSuite) TearDownSuite() {
 	_ = s.keycloakContainer.Terminate(context.Background())
 }
 
-//go:embed testdata/keycloak-ca.pem
+//go:embed testdata/new-ca.crt
 var ca []byte
 
 func (s *OAuthSuite) TestCertExchangeFromKeycloak() {
@@ -551,7 +551,7 @@ func setupKeycloak(ctx context.Context, t *testing.T) (tc.Container, string, str
 			"--spi-truststore-file-hostname-verification-policy=ANY",
 		},
 		Files: []tc.ContainerFile{
-			{HostFilePath: "testdata/ca.jks", ContainerFilePath: "/truststore/truststore.jks", FileMode: int64(0o777)},
+			{HostFilePath: "testdata/new-ca.jks", ContainerFilePath: "/truststore/truststore.jks", FileMode: int64(0o777)},
 			{HostFilePath: "testdata/localhost.crt", ContainerFilePath: "/etc/x509/tls/localhost.crt", FileMode: int64(0o777)},
 			{HostFilePath: "testdata/localhost.key", ContainerFilePath: "/etc/x509/tls/localhost.key", FileMode: int64(0o777)},
 		},
diff --git a/sdk/auth/oauth/testdata/ca.jks b/sdk/auth/oauth/testdata/ca.jks
deleted file mode 100644
index 74ece23517..0000000000
Binary files a/sdk/auth/oauth/testdata/ca.jks and /dev/null differ
diff --git a/sdk/auth/oauth/testdata/keycloak-ca.pem b/sdk/auth/oauth/testdata/keycloak-ca.pem
deleted file mode 100644
index ab60c4cc14..0000000000
--- a/sdk/auth/oauth/testdata/keycloak-ca.pem
+++ /dev/null
@@ -1,16 +0,0 @@
------BEGIN CERTIFICATE-----
-MIICljCCAX4CCQCbn54dZw//JTANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDDAJj
-YTAeFw0yNDA0MjUwMTUzMjlaFw0yNTA0MjUwMTUzMjlaMA0xCzAJBgNVBAMMAmNh
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-zNm+CPaRVCVdgZD0YwLee1z/mHsccLY68tZ72cg44WDIFv3Eqdxwc55e
------END CERTIFICATE-----
diff --git a/sdk/auth/oauth/testdata/localhost.crt b/sdk/auth/oauth/testdata/localhost.crt
index 17fb272576..2bfe20210f 100644
--- a/sdk/auth/oauth/testdata/localhost.crt
+++ b/sdk/auth/oauth/testdata/localhost.crt
@@ -1,17 +1,26 @@
 -----BEGIN CERTIFICATE-----
-MIICwjCCAaqgAwIBAgIJAKtVXCAer8hIMA0GCSqGSIb3DQEBCwUAMA0xCzAJBgNV
-BAMMAmNhMB4XDTI0MDQyNTAxNTMzMFoXDTM0MDQyMzAxNTMzMFowFDESMBAGA1UE
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+xSJN7KHHieas/nabhc4wP2/YheNaFuM=
 -----END CERTIFICATE-----
diff --git a/sdk/auth/oauth/testdata/new-ca.crt b/sdk/auth/oauth/testdata/new-ca.crt
new file mode 100644
index 0000000000..c5c90e00fd
--- /dev/null
+++ b/sdk/auth/oauth/testdata/new-ca.crt
@@ -0,0 +1,33 @@
+-----BEGIN CERTIFICATE-----
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+wi+lNvGtM5PexTk=
+-----END CERTIFICATE-----
diff --git a/sdk/auth/oauth/testdata/new-ca.jks b/sdk/auth/oauth/testdata/new-ca.jks
new file mode 100644
index 0000000000..4bb5e7dbda
Binary files /dev/null and b/sdk/auth/oauth/testdata/new-ca.jks differ
diff --git a/sdk/auth/oauth/testdata/new-ca.key b/sdk/auth/oauth/testdata/new-ca.key
new file mode 100644
index 0000000000..2c16768045
--- /dev/null
+++ b/sdk/auth/oauth/testdata/new-ca.key
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+edwJUrNCzm6zmzfHkSsov6NIS3te55k=
+-----END PRIVATE KEY-----
diff --git a/sdk/auth/oauth/testdata/sampleuser.crt b/sdk/auth/oauth/testdata/sampleuser.crt
index 99708cf6fa..eb1d3b071f 100644
--- a/sdk/auth/oauth/testdata/sampleuser.crt
+++ b/sdk/auth/oauth/testdata/sampleuser.crt
@@ -1,17 +1,26 @@
 -----BEGIN CERTIFICATE-----
-MIICnjCCAYYCCQCrVVwgHq/ISTANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDDAJj
-YTAeFw0yNDA0MjUwMTUzMzBaFw0zNDA0MjMwMTUzMzBaMBUxEzARBgNVBAMMCnNh
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 -----END CERTIFICATE-----
diff --git a/sdk/auth/oauth/testdata/sanX509.conf b/sdk/auth/oauth/testdata/sanX509.conf
new file mode 100644
index 0000000000..729de7a277
--- /dev/null
+++ b/sdk/auth/oauth/testdata/sanX509.conf
@@ -0,0 +1 @@
+subjectAltName=DNS:localhost,IP:127.0.0.1
diff --git a/sdk/auth/oauth/testdata/sanX509su.conf b/sdk/auth/oauth/testdata/sanX509su.conf
new file mode 100644
index 0000000000..53fcac1275
--- /dev/null
+++ b/sdk/auth/oauth/testdata/sanX509su.conf
@@ -0,0 +1 @@
+subjectAltName=email:sampleuser@example.com