diff --git a/.github/workflows/docs_dev.yml b/.github/workflows/docs_dev.yml
index a96808930..927acdcb3 100644
--- a/.github/workflows/docs_dev.yml
+++ b/.github/workflows/docs_dev.yml
@@ -17,7 +17,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -U virtualenv setuptools wheel tox
+        pip install -U virtualenv setuptools wheel 'tox<4'
         sudo apt-get install graphviz pandoc
     - name: Build and publish
       env:
diff --git a/.github/workflows/docs_release.yml b/.github/workflows/docs_release.yml
index ad99f9030..8a1c3f365 100644
--- a/.github/workflows/docs_release.yml
+++ b/.github/workflows/docs_release.yml
@@ -18,7 +18,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -U virtualenv setuptools wheel tox
+        pip install -U virtualenv setuptools wheel 'tox<4'
         sudo apt-get install graphviz pandoc
     - name: Build and publish
       env:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index daf1e1982..80b03f97e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -84,7 +84,7 @@ jobs:
           profile: minimal
           default: true
       - name: 'Install dependencies'
-        run: python -m pip install --upgrade tox
+        run: python -m pip install --upgrade 'tox<4'
       - name: 'Install binary dependencies'
         run: sudo apt-get install -y graphviz
         if: runner.os == 'Linux'
@@ -118,7 +118,7 @@ jobs:
           profile: minimal
           default: true
       - name: 'Install dependencies'
-        run: python -m pip install --upgrade tox
+        run: python -m pip install --upgrade 'tox<4'
       - name: 'Install binary dependencies'
         run: sudo apt-get install -y graphviz
         if: runner.os == 'Linux'
@@ -195,7 +195,7 @@ jobs:
       - name: Install binary deps
         run: sudo apt-get install -y graphviz
       - name: Install deps
-        run: pip install -U tox
+        run: pip install -U 'tox<4'
       - name: Build Docs
         run: tox -edocs
       - uses: actions/upload-artifact@v2
diff --git a/clippy.toml b/clippy.toml
new file mode 100644
index 000000000..56ce04e44
--- /dev/null
+++ b/clippy.toml
@@ -0,0 +1 @@
+msrv = "1.56.1"
diff --git a/docs/source/tutorial/betweenness_centrality.rst b/docs/source/tutorial/betweenness_centrality.rst
index 7375bb1c9..38114101f 100644
--- a/docs/source/tutorial/betweenness_centrality.rst
+++ b/docs/source/tutorial/betweenness_centrality.rst
@@ -98,7 +98,7 @@ Alternatively, you can use :func:`~rustworkx.visualization.graphviz_draw`:
         graph[node] = btw
 
     # Leverage matplotlib for color map
-    colormap = matplotlib.cm.get_cmap("magma")
+    colormap = matplotlib.colormaps["magma"]
     norm = matplotlib.colors.Normalize(
         vmin=min(centrality.values()),
         vmax=max(centrality.values())
diff --git a/src/digraph.rs b/src/digraph.rs
index 1702fa714..9394577e1 100644
--- a/src/digraph.rs
+++ b/src/digraph.rs
@@ -2688,14 +2688,14 @@ impl PyDiGraph {
     }
 
     fn __getitem__(&self, idx: usize) -> PyResult<&PyObject> {
-        match self.graph.node_weight(NodeIndex::new(idx as usize)) {
+        match self.graph.node_weight(NodeIndex::new(idx)) {
             Some(data) => Ok(data),
             None => Err(PyIndexError::new_err("No node found for index")),
         }
     }
 
     fn __setitem__(&mut self, idx: usize, value: PyObject) -> PyResult<()> {
-        let data = match self.graph.node_weight_mut(NodeIndex::new(idx as usize)) {
+        let data = match self.graph.node_weight_mut(NodeIndex::new(idx)) {
             Some(node_data) => node_data,
             None => return Err(PyIndexError::new_err("No node found for index")),
         };
@@ -2704,7 +2704,7 @@ impl PyDiGraph {
     }
 
     fn __delitem__(&mut self, idx: usize) -> PyResult<()> {
-        match self.graph.remove_node(NodeIndex::new(idx as usize)) {
+        match self.graph.remove_node(NodeIndex::new(idx)) {
             Some(_) => Ok(()),
             None => Err(PyIndexError::new_err("No node found for index")),
         }
diff --git a/src/graph.rs b/src/graph.rs
index 022fd8050..dd4610698 100644
--- a/src/graph.rs
+++ b/src/graph.rs
@@ -1746,7 +1746,7 @@ impl PyGraph {
     }
 
     fn __delitem__(&mut self, idx: usize) -> PyResult<()> {
-        match self.graph.remove_node(NodeIndex::new(idx as usize)) {
+        match self.graph.remove_node(NodeIndex::new(idx)) {
             Some(_) => Ok(()),
             None => Err(PyIndexError::new_err("No node found for index")),
         }