diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
index b59bdc2..18aa5b1 100644
--- a/.github/workflows/tox.yml
+++ b/.github/workflows/tox.yml
@@ -5,12 +5,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         python: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11']
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v3
+      - uses: actions/checkout@v3.3.0
+      - uses: actions/setup-python@v4.5.0
         with:
           python-version: ${{ matrix.python }}
       - run: pip install --upgrade pip
diff --git a/pylti1p3/contrib/django/lti1p3_tool_config/migrations/0001_initial.py b/pylti1p3/contrib/django/lti1p3_tool_config/migrations/0001_initial.py
index 625e129..0b850b8 100644
--- a/pylti1p3/contrib/django/lti1p3_tool_config/migrations/0001_initial.py
+++ b/pylti1p3/contrib/django/lti1p3_tool_config/migrations/0001_initial.py
@@ -5,7 +5,6 @@
 
 
 class Migration(migrations.Migration):
-
     initial = True
 
     dependencies = []
diff --git a/pylti1p3/deep_link_resource.py b/pylti1p3/deep_link_resource.py
index 131606f..e3c2103 100644
--- a/pylti1p3/deep_link_resource.py
+++ b/pylti1p3/deep_link_resource.py
@@ -8,6 +8,7 @@ class DeepLinkResource:
     _url: t.Optional[str] = None
     _lineitem: t.Optional[LineItem] = None
     _custom_params: t.Mapping[str, str] = {}
+    _iframe: t.Mapping[str, int] = {}
     _target: str = "iframe"
     _icon_url: t.Optional[str] = None
 
@@ -60,6 +61,13 @@ def set_icon_url(self, value: str) -> "DeepLinkResource":
         self._icon_url = value
         return self
 
+    def get_iframe(self) -> t.Mapping[str, int]:
+        return self._iframe
+
+    def set_iframe(self, value: t.Mapping[str, int]):
+        self._iframe = value
+        return self
+
     def to_dict(self) -> t.Dict[str, object]:
         res: t.Dict[str, object] = {
             "type": self._type,
@@ -93,4 +101,7 @@ def to_dict(self) -> t.Dict[str, object]:
         if self._icon_url:
             res["icon"] = {"url": self._icon_url}
 
+        if self._iframe:
+            res["iframe"] = self._iframe
+
         return res
diff --git a/pylti1p3/deployment.py b/pylti1p3/deployment.py
index cfbbf9b..2cceb94 100644
--- a/pylti1p3/deployment.py
+++ b/pylti1p3/deployment.py
@@ -2,7 +2,6 @@
 
 
 class Deployment:
-
     _deployment_id: t.Optional[str] = None
 
     def get_deployment_id(self) -> t.Optional[str]:
diff --git a/tests/test_deep_link.py b/tests/test_deep_link.py
index d9a3083..287fa6b 100644
--- a/tests/test_deep_link.py
+++ b/tests/test_deep_link.py
@@ -160,7 +160,7 @@ def test_deep_link_launch_success(self):
         resource = DeepLinkResource()
         resource.set_url("http://lti.django.test/launch/").set_custom_params(
             {"custom_param": "custom_value"}
-        ).set_title("Test title!")
+        ).set_title("Test title!").set_iframe({"width": 800, "height": 400})
 
         deep_link_return_url = message_launch_data.get(
             "https://purl.imsglobal.org/spec/lti-dl/claim/deep_linking_settings"
diff --git a/tests/test_resource_link.py b/tests/test_resource_link.py
index cb669c4..85477fa 100644
--- a/tests/test_resource_link.py
+++ b/tests/test_resource_link.py
@@ -299,7 +299,6 @@ def _get_data_with_invalid_message(self, *args):  # pylint: disable=unused-argum
         return message_launch_data
 
     def test_res_link_launch_invalid_nonce(self):
-
         tool_conf, login_request, login_response = self._make_oidc_login()
 
         post_data = self.post_launch_data.copy()
diff --git a/tox.ini b/tox.ini
index 51058bd..e25a59d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,7 @@ deps =
     mypy
     parameterized
     pyjwt
-    pylint
+    pylint<2.15.6
     requests
     requests-mock
     types-requests