diff --git a/cwltool/cwlviewer.py b/cwltool/cwlviewer.py
index e544a568e..ba3c70f28 100644
--- a/cwltool/cwlviewer.py
+++ b/cwltool/cwlviewer.py
@@ -100,7 +100,6 @@ def _set_input_edges(self) -> None:
         inputs_subgraph = pydot.Subgraph(graph_name="cluster_inputs")
         self._dot_graph.add_subgraph(inputs_subgraph)
         inputs_subgraph.set("rank", "same")
-        inputs_subgraph.create_attribute_methods(["style"])
         inputs_subgraph.set("style", "dashed")
         inputs_subgraph.set("label", "Workflow Inputs")
 
@@ -128,7 +127,6 @@ def _set_output_edges(self) -> None:
         outputs_graph = pydot.Subgraph(graph_name="cluster_outputs")
         self._dot_graph.add_subgraph(outputs_graph)
         outputs_graph.set("rank", "same")
-        outputs_graph.create_attribute_methods(["style"])
         outputs_graph.set("style", "dashed")
         outputs_graph.set("label", "Workflow Outputs")
         outputs_graph.set("labelloc", "b")
diff --git a/requirements.txt b/requirements.txt
index df82a6f43..6d915e657 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ mypy-extensions
 psutil>=5.6.6
 importlib_resources>=1.4;python_version<'3.9'
 coloredlogs
-pydot>=1.4.1,<3
+pydot>=1.4.1
 argcomplete>=1.12.0
 pyparsing!=3.0.2  # breaks --print-dot (pydot) https://github.com/pyparsing/pyparsing/issues/319
 cwl-utils>=0.32
diff --git a/setup.py b/setup.py
index 748e97aae..b4b9172e9 100644
--- a/setup.py
+++ b/setup.py
@@ -133,7 +133,7 @@
         "psutil >= 5.6.6",
         "importlib_resources>=1.4;python_version<'3.9'",
         "coloredlogs",
-        "pydot >= 1.4.1, <3",
+        "pydot >= 1.4.1",
         "argcomplete",
         "pyparsing != 3.0.2",  # breaks --print-dot (pydot) https://github.com/pyparsing/pyparsing/issues/319
         "cwl-utils >= 0.32",