diff --git a/.github/workflows/github-ci.yml b/.github/workflows/github-ci.yml
index c308f769..1068faed 100644
--- a/.github/workflows/github-ci.yml
+++ b/.github/workflows/github-ci.yml
@@ -33,7 +33,6 @@ jobs:
         run: pre-commit run --all-files
 
 
-
   test:
 
     runs-on: ${{ matrix.os }}
@@ -41,7 +40,7 @@ jobs:
       fail-fast: false
       matrix:
         # temporarily downgraded to 3.7.9 and 3.8.10 due to a bug https://github.com/actions/setup-python/issues/402
-        python-version: ["3.7.9", "3.8.10", "3.9.13", "3.10.9", "pypy3.9-v7.3.9"]
+        python-version: ["3.7.9", "3.8.10", "3.9.13", "3.10.9", "3.11.1", "pypy3.9-v7.3.9"]
         os: [macos-11, macos-12, ubuntu-20.04, ubuntu-22.04, windows-2019, windows-2022]
         exclude:
           # temporarily exclude pypy3 on mac-os as there failing tests caused by bug on cbc side
@@ -82,13 +81,14 @@ jobs:
         path: ${{ steps.pip-cache.outputs.dir }}
         key: ${{ runner.os }}-${{ matrix.python-version }}-pythonpip
 
-    - name: Install additional requirements (CPython)
-      if: ${{ matrix.python-version != 'pypy3.9-v7.3.9' }}
-      run: python -m pip install "matplotlib==3.5.2" "gurobipy==9.5.1"
-
-    - name: Install mip
+    - name: Install mip for testing (PyPy)
+      if: ${{ matrix.python-version == 'pypy3.9-v7.3.9' }}
       run: python -m pip install .[test,numpy]
 
+    - name: Install mip for testing (CPython)
+      if: ${{ matrix.python-version != 'pypy3.9-v7.3.9' }}
+      run: python -m pip install .[test,numpy,gurobi]
+
     - name: list installed packages
       run: python -m pip list
 
diff --git a/examples/plant_location.py b/examples/plant_location.py
index ee589256..df346975 100644
--- a/examples/plant_location.py
+++ b/examples/plant_location.py
@@ -11,13 +11,6 @@
 
 import sys
 
-# If running as a unit test, then skip if under pypy
-if hasattr(sys, '_called_from_test') and sys._called_from_test is True:
-    import platform
-    if 'pypy' in platform.python_implementation().lower():
-        import pytest
-        pytest.skip("Matplotlib installation not working under pypy")
-
 # Workaround for issues with python not being installed as a framework on mac
 # by using a different backend.
 if sys.platform == "darwin":  # OS X
diff --git a/pyproject.toml b/pyproject.toml
index b37eb9ff..b618017d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "mip"
 description = "Python tools for Modeling and Solving Mixed-Integer Linear Programs (MIPs)"
 readme = "README.md"
-requires-python = ">=3.7,<3.11"
+requires-python = ">=3.7,<3.12"
 license = {file = "LICENSE"}
 authors = [
     {name="T.A.M. Toffolo", email="haroldo.santos@gmail.com"},
@@ -32,12 +32,12 @@ classifiers = [
 ]
 dynamic = ["version"]
 
-dependencies = ["cffi==1.15.0"]
+dependencies = ["cffi==1.15.*"]
 
 [project.optional-dependencies]
-numpy = ["numpy==1.24.1; python_version >= '3.8'", "numpy==1.21.6; python_version == '3.7'"]
+numpy = ["numpy==1.24.*; python_version >= '3.8'", "numpy==1.21.6; python_version == '3.7'"]
 gurobi = ["gurobipy>=8"]
-test = ["pytest==7.2.0", "networkx==2.6.3"]
+test = ["pytest==7.2.0", "networkx==2.8.8; python_version >= '3.8'", "networkx==2.6.3; python_version == '3.7'", "matplotlib==3.6.2; python_version >= '3.8'", "matplotlib==3.5.3; python_version == '3.7'"]
 
 [project.urls]
 "Homepage" = "https://www.python-mip.com"