diff --git a/integration-tests/grpc-mutual-auth/src/main/resources/tls/README.md b/integration-tests/grpc-mutual-auth/src/main/resources/tls/README.md
index 87d29962a73c7..6c1d2f66d892e 100644
--- a/integration-tests/grpc-mutual-auth/src/main/resources/tls/README.md
+++ b/integration-tests/grpc-mutual-auth/src/main/resources/tls/README.md
@@ -4,7 +4,7 @@ The ca is self-signed:
 ----------------------
 
 ```bash
-openssl req -x509 -new -newkey rsa:2048 -nodes -keyout ca.key -out ca.pem \
+openssl req -x509 -new -newkey rsa:4096 -nodes -keyout ca.key -out ca.pem \
   -config ca-openssl.cnf -days 3650 -extensions v3_req
 ```
 
@@ -15,7 +15,7 @@ Client is issued by CA:
 -----------------------
 
 ```bash
-openssl genrsa -out client.key.rsa 2048
+openssl genrsa -out client.key.rsa 4096
 openssl pkcs8 -topk8 -in client.key.rsa -out client.key -nocrypt
 openssl req -new -key client.key -out client.csr
 ```
@@ -32,8 +32,8 @@ server is issued by CA with a special config for subject alternative names:
 ----------------------------------------------------------------------------
 
 ```bash
-openssl genrsa -out server1.key.rsa 2048
-openssl pkcs8 -topk8 -in server.key.rsa -out server.key -nocrypt
+openssl genrsa -out server1.key.rsa 4096
+openssl pkcs8 -topk8 -in server1.key.rsa -out server.key -nocrypt
 openssl req -new -key server.key -out server.csr -config server-openssl.cnf
 ```
 
diff --git a/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.jks b/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.jks
index cdfad2202c524..4129c4e569222 100644
Binary files a/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.jks and b/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.jks differ
diff --git a/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.key b/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.key
index d6185b2ee88bc..1e9a7b0c46a18 100644
--- a/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.key
+++ b/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.key
@@ -1,28 +1,52 @@
 -----BEGIN PRIVATE KEY-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDRmkRSP5lK/eKi
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+lyskjDltoHDOugbHwdMJ2UxFk00Riw==
 -----END PRIVATE KEY-----
diff --git a/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.pem b/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.pem
index bdc497b44945b..664e24ec1a2c1 100644
--- a/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.pem
+++ b/integration-tests/grpc-mutual-auth/src/main/resources/tls/ca.pem
@@ -1,20 +1,31 @@
 -----BEGIN CERTIFICATE-----
-MIIDMTCCAhmgAwIBAgIJAM9e7Tsk0nLvMA0GCSqGSIb3DQEBCwUAMEcxCzAJBgNV
-BAYTAkZSMRMwEQYDVQQIDApTb21lLVN0YXRlMRIwEAYDVQQKDAlBY21lIENvcnAx
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 -----END CERTIFICATE-----
diff --git a/integration-tests/grpc-mutual-auth/src/main/resources/tls/client.key b/integration-tests/grpc-mutual-auth/src/main/resources/tls/client.key
index daf96503c1cfe..73e5c53d457a4 100644
--- a/integration-tests/grpc-mutual-auth/src/main/resources/tls/client.key
+++ b/integration-tests/grpc-mutual-auth/src/main/resources/tls/client.key
@@ -1,28 +1,52 @@
 -----BEGIN PRIVATE KEY-----
-MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCQxeqb5YkITWHm
-rByVEhlmUNuhuRGm2m0x/jMV98aqWZX6vGS1E8U6cW279xgYV+kTRqvey1d7zMu/
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 -----END PRIVATE KEY-----
diff --git a/integration-tests/grpc-mutual-auth/src/main/resources/tls/client.pem b/integration-tests/grpc-mutual-auth/src/main/resources/tls/client.pem
index 7147f4a84bf84..15b265f590bd5 100644
--- a/integration-tests/grpc-mutual-auth/src/main/resources/tls/client.pem
+++ b/integration-tests/grpc-mutual-auth/src/main/resources/tls/client.pem
@@ -1,18 +1,30 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/integration-tests/grpc-mutual-auth/src/main/resources/tls/server.key b/integration-tests/grpc-mutual-auth/src/main/resources/tls/server.key
index 8462aadcafc80..655c63a5bd5df 100644
--- a/integration-tests/grpc-mutual-auth/src/main/resources/tls/server.key
+++ b/integration-tests/grpc-mutual-auth/src/main/resources/tls/server.key
@@ -1,28 +1,52 @@
 -----BEGIN PRIVATE KEY-----
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+2Z40QnJxfKEF9bBwXJKSZHS9XKzcoqC1
 -----END PRIVATE KEY-----
diff --git a/integration-tests/grpc-mutual-auth/src/main/resources/tls/server.pem b/integration-tests/grpc-mutual-auth/src/main/resources/tls/server.pem
index 30711cfa53e42..60edfafca4ba4 100644
--- a/integration-tests/grpc-mutual-auth/src/main/resources/tls/server.pem
+++ b/integration-tests/grpc-mutual-auth/src/main/resources/tls/server.pem
@@ -1,19 +1,30 @@
 -----BEGIN CERTIFICATE-----
-MIIDJDCCAgygAwIBAgIJALJ1FM2npxETMA0GCSqGSIb3DQEBBQUAMEcxCzAJBgNV
-BAYTAkZSMRMwEQYDVQQIDApTb21lLVN0YXRlMRIwEAYDVQQKDAlBY21lIENvcnAx
-DzANBgNVBAMMBnRlc3RjYTAeFw0yMDA0MDQxMjE1MDVaFw0zMDA0MDIxMjE1MDVa
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 -----END CERTIFICATE-----
diff --git a/integration-tests/grpc-tls/src/main/resources/tls/README.md b/integration-tests/grpc-tls/src/main/resources/tls/README.md
index 8c1886e98b5e4..3d6af99d99dc0 100644
--- a/integration-tests/grpc-tls/src/main/resources/tls/README.md
+++ b/integration-tests/grpc-tls/src/main/resources/tls/README.md
@@ -4,8 +4,8 @@ The ca is self-signed:
 ----------------------
 
 ```bash
-openssl req -x509 -new -newkey rsa:2048 -nodes -keyout ca.key -out ca.pem \
-  -config ca-openssl.cnf -days 3650 -extensions v3_req
+openssl req -x509 -new -newkey rsa:4096 -nodes -keyout ca.key -out ca.pem \
+-config ca-openssl.cnf -days 3650 -extensions v3_req
 ```
 
 When prompted for certificate information, everything is default.
@@ -14,7 +14,7 @@ Client is issued by CA:
 -----------------------
 
 ```bash
-openssl genrsa -out client.key.rsa 2048
+openssl genrsa -out client.key.rsa 4096
 openssl pkcs8 -topk8 -in client.key.rsa -out client.key -nocrypt
 openssl req -new -key client.key -out client.csr
 ```
@@ -31,8 +31,8 @@ server is issued by CA with a special config for subject alternative names:
 ----------------------------------------------------------------------------
 
 ```bash
-openssl genrsa -out server1.key.rsa 2048
-openssl pkcs8 -topk8 -in server.key.rsa -out server.key -nocrypt
+openssl genrsa -out server1.key.rsa 4096
+openssl pkcs8 -topk8 -in server1.key.rsa -out server.key -nocrypt
 openssl req -new -key server.key -out server.csr -config server-openssl.cnf
 ```
 
diff --git a/integration-tests/grpc-tls/src/main/resources/tls/ca.pem b/integration-tests/grpc-tls/src/main/resources/tls/ca.pem
index b3c622bc96b47..a4a48b8a02406 100644
--- a/integration-tests/grpc-tls/src/main/resources/tls/ca.pem
+++ b/integration-tests/grpc-tls/src/main/resources/tls/ca.pem
@@ -1,20 +1,31 @@
 -----BEGIN CERTIFICATE-----
-MIIDMTCCAhmgAwIBAgIJAKH9BBbnY/fjMA0GCSqGSIb3DQEBCwUAMEcxCzAJBgNV
-BAYTAkZSMRMwEQYDVQQIDApTb21lLVN0YXRlMRIwEAYDVQQKDAlBY21lIENvcnAx
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 -----END CERTIFICATE-----
diff --git a/integration-tests/grpc-tls/src/main/resources/tls/server.key b/integration-tests/grpc-tls/src/main/resources/tls/server.key
index b49d98c926e61..62560725b6c0a 100644
--- a/integration-tests/grpc-tls/src/main/resources/tls/server.key
+++ b/integration-tests/grpc-tls/src/main/resources/tls/server.key
@@ -1,28 +1,52 @@
 -----BEGIN PRIVATE KEY-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCy40A8Keuwa6aK
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 -----END PRIVATE KEY-----
diff --git a/integration-tests/grpc-tls/src/main/resources/tls/server.pem b/integration-tests/grpc-tls/src/main/resources/tls/server.pem
index 0564aead54463..e3ea1e5b98864 100644
--- a/integration-tests/grpc-tls/src/main/resources/tls/server.pem
+++ b/integration-tests/grpc-tls/src/main/resources/tls/server.pem
@@ -1,19 +1,30 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----