diff --git a/docs/source/conf.py b/docs/source/conf.py
index e37a1b2c..b1a2a019 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -57,9 +57,9 @@
     'rabbitmq': '[RabbitMQ](https://www.rabbitmq.com/)',
     'kiwipy': '[kiwipy](https://kiwipy.readthedocs.io)',
 }
-nb_execution_mode = 'cache'
-nb_execution_show_tb = 'READTHEDOCS' in os.environ
-nb_execution_timeout = 60
+jupyter_execute_notebooks = 'cache'
+execution_show_tb = 'READTHEDOCS' in os.environ
+execution_timeout = 60
 
 # Warnings to ignore when using the -n (nitpicky) option
 # We should ignore any python built-in exception, for instance
diff --git a/examples/process_helloworld.py b/examples/process_helloworld.py
index 16526510..db2eff0f 100644
--- a/examples/process_helloworld.py
+++ b/examples/process_helloworld.py
@@ -9,7 +9,7 @@ def define(cls, spec):
         spec.input('name', default='World', required=True)
         spec.output('greeting', valid_type=str)
 
-    async def run(self):
+    def run(self):
         self.out('greeting', f'Hello {self.inputs.name}!')
         return plumpy.Stop(None, True)
 
diff --git a/examples/process_launch.py b/examples/process_launch.py
index b3a212f6..645af0fd 100644
--- a/examples/process_launch.py
+++ b/examples/process_launch.py
@@ -18,7 +18,7 @@ def define(cls, spec):
         spec.outputs.dynamic = True
         spec.output('default', valid_type=int)
 
-    async def run(self):
+    def run(self):
         self.out('default', 5)
 
 
diff --git a/tests/test_workchains.py b/tests/test_workchains.py
index bd202adc..08c7317a 100644
--- a/tests/test_workchains.py
+++ b/tests/test_workchains.py
@@ -205,7 +205,7 @@ def define(cls, spec):
                 super().define(spec)
                 spec.output('res')
 
-            async def run(self):
+            def run(self):
                 self.out('res', A)
 
         class ReturnB(plumpy.Process):
@@ -214,7 +214,7 @@ def define(cls, spec):
                 super().define(spec)
                 spec.output('res')
 
-            async def run(self):
+            def run(self):
                 self.out('res', B)
 
         class Wf(WorkChain):
@@ -394,7 +394,7 @@ def define(cls, spec):
                 spec.outline(cls.run, cls.check)
                 spec.outputs.dynamic = True
 
-            async def run(self):
+            def run(self):
                 return ToContext(subwc=self.launch(SubWorkChain))
 
             def check(self):
@@ -406,7 +406,7 @@ def define(cls, spec):
                 super().define(spec)
                 spec.outline(cls.run)
 
-            async def run(self):
+            def run(self):
                 self.out('value', 5)
 
         workchain = MainWorkChain()
@@ -449,7 +449,7 @@ def define(cls, spec):
                 super().define(spec)
                 spec.output('_return')
 
-            async def run(self):
+            def run(self):
                 self.out('_return', val)
 
         class Workchain(WorkChain):
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 39cc11f5..00000000
--- a/tox.ini
+++ /dev/null
@@ -1,44 +0,0 @@
-# To use tox, see https://tox.readthedocs.io
-# Simply pip or conda install tox
-# If you use conda, you may also want to install tox-conda
-# then run `tox` or `tox -- {pytest args}`
-# run in parallel using `tox -p`
-
-# see also test/rmq/docker-compose.yml to start a rabbitmq server, required for the those tests
-
-[tox]
-envlist = py37
-
-[testenv]
-usedevelop = true
-
-[testenv:py{37,38,39}]
-description = Run the unit tests
-extras =
-    tests
-commands = pytest {posargs}
-
-[testenv:pre-commit]
-description = Run the style checks and formatting
-extras =
-    pre-commit
-    tests
-commands = pre-commit run {posargs}
-
-[testenv:docs-{update,clean}]
-description = Build the documentation
-extras = docs
-whitelist_externals = rm
-commands =
-    clean: rm -rf docs/_build
-    sphinx-build -nW --keep-going -b {posargs:html} docs/source/ docs/_build/{posargs:html}
-
-[testenv:docs-live]
-description = Build the documentation and launch browser (with live updates)
-extras = docs
-deps = sphinx-autobuild
-commands =
-    sphinx-autobuild \
-        --re-ignore _build/.* \
-        --port 0 --open-browser \
-        -n -b {posargs:html} docs/source/ docs/_build/{posargs:html}