diff --git a/.github/workflows/deploy.yaml b/.github/workflows/deploy.yaml
index 8d2a7499..0860ce5f 100644
--- a/.github/workflows/deploy.yaml
+++ b/.github/workflows/deploy.yaml
@@ -6,11 +6,11 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.9
       - name: Install dependencies
@@ -23,4 +23,4 @@ jobs:
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
           user: __token__
-          password: ${{ secrets.PYPI_API_TOKEN }}
\ No newline at end of file
+          password: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index d510d048..b11daa6b 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -8,15 +8,15 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10"]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
@@ -43,4 +43,4 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           pip install coveralls
-          coveralls --service=github
\ No newline at end of file
+          coveralls --service=github
diff --git a/README.rst b/README.rst
index cb3cad62..edb49dd2 100644
--- a/README.rst
+++ b/README.rst
@@ -117,7 +117,7 @@ You can cite the associated research article (`PDF <https://decan.lexpage.net/fi
 External Resources
 ------------------
 
-The following ressources provide additional information about statecharts that may be of use, even if it is not immediately related to Sismic.
+The following resources provide additional information about statecharts that may be of use, even if it is not immediately related to Sismic.
 
 * `Yakindu Statechart tools <https://www.itemis.com/en/yakindu/state-machine/>`__: commercial software for visual simulation, debugging, testing and code generation from statecharts. A free academic licence can be obtained for universities.
 * A `YouTube playlist <https://www.youtube.com/playlist?list=PLmHMvhX5wK_aohX5sOeAMogFDwlc3gJYR>`__ providing a set of introductory tutorials about statechart modeling and simulation (based on the aforementioned Yakindu tool).
diff --git a/docs/time.rst b/docs/time.rst
index 8142b5dc..9eaf629c 100644
--- a/docs/time.rst
+++ b/docs/time.rst
@@ -331,7 +331,7 @@ an interpreter's :py:meth:`~sismic.interpreter.Interpreter.queue` method.
 
 
 Delayed events are not processed by the interpreter, as long as the current clock
-as not reach given delay. 
+has not reached given delay. 
 
 .. testcode:: delayed
 
diff --git a/setup.py b/setup.py
index d61ce738..0ab091f5 100644
--- a/setup.py
+++ b/setup.py
@@ -42,6 +42,7 @@
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
     ],
     keywords='statechart state machine interpreter model uml scxml harel',
 
@@ -49,7 +50,7 @@
     python_requires='>=3.5',
     install_requires=[
         'ruamel.yaml>=0.12.10',
-        'schema>=0.6.2',
+        'schema>=0.5.0',
         'behave>=1.2.6',
     ],