diff --git a/.github/workflows/client-test.yml b/.github/workflows/client-test.yml
index e838988..18118c4 100644
--- a/.github/workflows/client-test.yml
+++ b/.github/workflows/client-test.yml
@@ -76,7 +76,15 @@ jobs:
         DEVICE_ID: ${{ secrets.DEVICE_ID1 }}
         SECRET_KEY: ${{ secrets.SECRET_KEY }}
       run: |
-        python tests/ci.py
+        python tests/ci.py --basic-auth
+
+    - name: '☁️  Connect to IoT cloud (CPython / Key/Cert Auth)'
+      env:
+        DEVICE_ID: ${{ secrets.DEVICE_ID2 }}
+        SECRET_KEY: ${{ secrets.SECRET_KEY }}
+      run: |
+        python tests/ci.py --file-auth
+
 
     - name: '☁️  Connect to IoT cloud (CPython / Crypto Auth)'
       env:
@@ -93,4 +101,4 @@ jobs:
       run: |
         export PATH="${HOME}/cache/bin:${PATH}"
         micropython -c "import sys; print(sys.path)"
-        micropython tests/ci.py
+        micropython tests/ci.py --basic-auth
diff --git a/tests/ci.py b/tests/ci.py
index 45c277e..9bf3288 100644
--- a/tests/ci.py
+++ b/tests/ci.py
@@ -27,7 +27,13 @@ def on_value_changed(client, value):
         "-d", "--debug", action="store_true", help="Enable debugging messages"
     )
     parser.add_argument(
-        "-c", "--crypto-device", action="store_true", help="Use crypto device"
+        "-b", "--basic-auth", action="store_true", help="Username and password auth",
+    )
+    parser.add_argument(
+        "-c", "--crypto-device", action="store_true", help="Use soft-hsm/crypto device",
+    )
+    parser.add_argument(
+        "-f", "--file-auth", action="store_true", help="Use key/cert files"
     )
     args = parser.parse_args()
 
@@ -45,8 +51,25 @@ def on_value_changed(client, value):
     # the CA certificate (if any) in "ssl_params". Alternatively, a username and password can
     # be used to authenticate, for example:
     #   client = ArduinoCloudClient(device_id=DEVICE_ID, username=DEVICE_ID, password=SECRET_KEY)
-    if args.crypto_device:
-        import arduino_iot_cloud.ussl as ssl
+    if args.basic_auth:
+        client = ArduinoCloudClient(
+            device_id=os.getenv("DEVICE_ID"),
+            username=os.getenv("DEVICE_ID"),
+            password=os.getenv("SECRET_KEY"),
+        )
+    elif args.file_auth:
+        import ssl
+        client = ArduinoCloudClient(
+            device_id=os.getenv("DEVICE_ID"),
+            ssl_params={
+                "keyfile": "key.pem",
+                "certfile": "cert.pem",
+                "ca_certs": "ca-root.pem",
+                "cert_reqs": ssl.CERT_REQUIRED,
+            },
+        )
+    elif args.crypto_device:
+        import ssl
         client = ArduinoCloudClient(
             device_id=os.getenv("DEVICE_ID"),
             ssl_params={
@@ -60,11 +83,8 @@ def on_value_changed(client, value):
             },
         )
     else:
-        client = ArduinoCloudClient(
-            device_id=os.getenv("DEVICE_ID"),
-            username=os.getenv("DEVICE_ID"),
-            password=os.getenv("SECRET_KEY"),
-        )
+        parser.print_help()
+        sys.exit(1)
 
     # Register cloud objects.
     # Note: The following objects must be created first in the dashboard and linked to the device.
diff --git a/tests/ci.sh b/tests/ci.sh
index b300947..b1bdbc5 100755
--- a/tests/ci.sh
+++ b/tests/ci.sh
@@ -6,11 +6,10 @@ ci_install_micropython() {
 
 	sudo apt-get install gcc-arm-none-eabi libnewlib-arm-none-eabi
 
-	git clone --depth=1 https://github.com/micropython/micropython.git
+	git clone --branch v1.20.0 --depth=1 https://github.com/micropython/micropython.git
 
 	cat > micropython/ports/unix/manifest.py <<-EOF
 	include("\$(PORT_DIR)/variants/manifest.py")
-	include("\$(MPY_DIR)/extmod/asyncio")
 	require("bundle-networking")
 	require("time")
 	require("senml")