diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4218e23b..e710138f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -68,13 +68,11 @@ jobs:
         with:
           secrets: |-
             MYSQL_CONNECTION_NAME:${{ vars.GOOGLE_CLOUD_PROJECT }}/MYSQL_CONNECTION_NAME
-            MYSQL_IAM_CONNECTION_NAME:${{ vars.GOOGLE_CLOUD_PROJECT }}/MYSQL_IAM_CONNECTION_NAME
             MYSQL_USER:${{ vars.GOOGLE_CLOUD_PROJECT }}/MYSQL_USER
             MYSQL_IAM_USER:${{ vars.GOOGLE_CLOUD_PROJECT }}/MYSQL_USER_IAM_PYTHON
             MYSQL_PASS:${{ vars.GOOGLE_CLOUD_PROJECT }}/MYSQL_PASS
             MYSQL_DB:${{ vars.GOOGLE_CLOUD_PROJECT }}/MYSQL_DB
             POSTGRES_CONNECTION_NAME:${{ vars.GOOGLE_CLOUD_PROJECT }}/POSTGRES_CONNECTION_NAME
-            POSTGRES_IAM_CONNECTION_NAME:${{ vars.GOOGLE_CLOUD_PROJECT }}/POSTGRES_IAM_CONNECTION_NAME
             POSTGRES_USER:${{ vars.GOOGLE_CLOUD_PROJECT }}/POSTGRES_USER
             POSTGRES_IAM_USER:${{ vars.GOOGLE_CLOUD_PROJECT }}/POSTGRES_USER_IAM_PYTHON
             POSTGRES_PASS:${{ vars.GOOGLE_CLOUD_PROJECT }}/POSTGRES_PASS
@@ -91,13 +89,11 @@ jobs:
       - name: Run tests
         env:
           MYSQL_CONNECTION_NAME: "${{ steps.secrets.outputs.MYSQL_CONNECTION_NAME }}"
-          MYSQL_IAM_CONNECTION_NAME: "${{ steps.secrets.outputs.MYSQL_IAM_CONNECTION_NAME }}"
           MYSQL_USER: "${{ steps.secrets.outputs.MYSQL_USER }}"
           MYSQL_IAM_USER: "${{ steps.secrets.outputs.MYSQL_IAM_USER }}"
           MYSQL_PASS: "${{ steps.secrets.outputs.MYSQL_PASS }}"
           MYSQL_DB: "${{ steps.secrets.outputs.MYSQL_DB }}"
           POSTGRES_CONNECTION_NAME: "${{ steps.secrets.outputs.POSTGRES_CONNECTION_NAME }}"
-          POSTGRES_IAM_CONNECTION_NAME: "${{ steps.secrets.outputs.POSTGRES_IAM_CONNECTION_NAME }}"
           POSTGRES_USER: "${{ steps.secrets.outputs.POSTGRES_USER }}"
           POSTGRES_IAM_USER: "${{ steps.secrets.outputs.POSTGRES_IAM_USER }}"
           POSTGRES_PASS: "${{ steps.secrets.outputs.POSTGRES_PASS }}"
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index df5533c8..43ece895 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -57,23 +57,19 @@ To run all integration tests against real Cloud SQL instances
 1. Once created, set the following environment variables:
 
 ```sh
+# MySQL instance with IAM authentication enabled
 export MYSQL_CONNECTION_NAME="<PROJECT>:<REGION>:<INSTANCE>"
 export MYSQL_USER="db_user"
 export MYSQL_PASS="db_pass"
 export MYSQL_DB="db_name"
-# MySQL instance with IAM authentication enabled
-# (can be same as MYSQL_CONNECTION_NAME)
-export MYSQL_IAM_CONNECTION_NAME="<PROJECT>:<REGION>:<INSTANCE>"
 # IAM Principal of ADC sourced credentials (truncated)
 export MYSQL_IAM_USER="test-user@gmail.com"
 
+# Postgres instance with IAM authentication enabled
 export POSTGRES_CONNECTION_NAME="<PROJECT>:<REGION>:<INSTANCE>"
 export POSTGRES_USER="db_user"
 export POSTGRES_PASS="db_pass"
 export POSTGRES_DB="db_name"
-# Postgres instance with IAM authentication enabled
-# (can be same as POSTGRES_CONNECTION_NAME)
-export POSTGRES_IAM_CONNECTION_NAME="<PROJECT>:<REGION>:<INSTANCE>"
 # IAM Principal of ADC sourced credentials
 export POSTGRES_IAM_USER="test-user@gmail.com"
 
diff --git a/tests/system/test_asyncpg_iam_auth.py b/tests/system/test_asyncpg_iam_auth.py
index 103efd1a..6e96d96b 100644
--- a/tests/system/test_asyncpg_iam_auth.py
+++ b/tests/system/test_asyncpg_iam_auth.py
@@ -86,7 +86,7 @@ async def getconn() -> asyncpg.Connection:
 
 async def test_iam_authn_connection_with_asyncpg() -> None:
     """Basic test to get time from database."""
-    inst_conn_name = os.environ["POSTGRES_IAM_CONNECTION_NAME"]
+    inst_conn_name = os.environ["POSTGRES_CONNECTION_NAME"]
     user = os.environ["POSTGRES_IAM_USER"]
     db = os.environ["POSTGRES_DB"]
 
@@ -101,7 +101,7 @@ async def test_iam_authn_connection_with_asyncpg() -> None:
 
 async def test_lazy_iam_authn_connection_with_asyncpg() -> None:
     """Basic test to get time from database."""
-    inst_conn_name = os.environ["POSTGRES_IAM_CONNECTION_NAME"]
+    inst_conn_name = os.environ["POSTGRES_CONNECTION_NAME"]
     user = os.environ["POSTGRES_IAM_USER"]
     db = os.environ["POSTGRES_DB"]
 
diff --git a/tests/system/test_pg8000_iam_auth.py b/tests/system/test_pg8000_iam_auth.py
index 60d2974f..9a8607bc 100644
--- a/tests/system/test_pg8000_iam_auth.py
+++ b/tests/system/test_pg8000_iam_auth.py
@@ -84,7 +84,7 @@ def getconn() -> pg8000.dbapi.Connection:
 
 def test_pg8000_iam_authn_connection() -> None:
     """Basic test to get time from database."""
-    inst_conn_name = os.environ["POSTGRES_IAM_CONNECTION_NAME"]
+    inst_conn_name = os.environ["POSTGRES_CONNECTION_NAME"]
     user = os.environ["POSTGRES_IAM_USER"]
     db = os.environ["POSTGRES_DB"]
 
@@ -99,7 +99,7 @@ def test_pg8000_iam_authn_connection() -> None:
 
 def test_lazy_pg8000_iam_authn_connection() -> None:
     """Basic test to get time from database."""
-    inst_conn_name = os.environ["POSTGRES_IAM_CONNECTION_NAME"]
+    inst_conn_name = os.environ["POSTGRES_CONNECTION_NAME"]
     user = os.environ["POSTGRES_IAM_USER"]
     db = os.environ["POSTGRES_DB"]
 
diff --git a/tests/system/test_pymysql_iam_auth.py b/tests/system/test_pymysql_iam_auth.py
index 80a10a13..9a617b6f 100644
--- a/tests/system/test_pymysql_iam_auth.py
+++ b/tests/system/test_pymysql_iam_auth.py
@@ -84,7 +84,7 @@ def getconn() -> pymysql.Connection:
 
 def test_pymysql_iam_authn_connection() -> None:
     """Basic test to get time from database."""
-    inst_conn_name = os.environ["MYSQL_IAM_CONNECTION_NAME"]
+    inst_conn_name = os.environ["MYSQL_CONNECTION_NAME"]
     user = os.environ["MYSQL_IAM_USER"]
     db = os.environ["MYSQL_DB"]
 
@@ -99,7 +99,7 @@ def test_pymysql_iam_authn_connection() -> None:
 
 def test_lazy_pymysql_iam_authn_connection() -> None:
     """Basic test to get time from database."""
-    inst_conn_name = os.environ["MYSQL_IAM_CONNECTION_NAME"]
+    inst_conn_name = os.environ["MYSQL_CONNECTION_NAME"]
     user = os.environ["MYSQL_IAM_USER"]
     db = os.environ["MYSQL_DB"]