diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ed4ce27..6209e71 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,6 +35,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install .
+          pip install "matplotlib<3.7" "numpy<1.24.2"
 
           # check package is importable
           python -c "import ploomber_engine"
diff --git a/tests/test_execute.py b/tests/test_execute.py
index df170cc..0954062 100644
--- a/tests/test_execute.py
+++ b/tests/test_execute.py
@@ -369,10 +369,7 @@ def test_execute_notebook_invalid_save_profiling_data(
 # seems like we have some shared state, we're getting a plot even though the
 # code is only printing the current working directory, the problem is in the line:
 # self._shell._get_output()
-# this started happening after removing the matplotlib<3.7 pin
-@pytest.mark.skip(
-    reason="skip. this started failing after we removed the matplotlib<3.7 pin"
-)
+# this happens if we remove the pip install "matplotlib<3.7" "numpy<1.24.2" from ci.yml
 def test_execute_notebook_different_cwd(tmp_empty):
     # setup
     run_dir = Path("run_dir")
diff --git a/tests/test_memory_release_nb.py b/tests/test_memory_release_nb.py
index b783ae0..a1ff969 100644
--- a/tests/test_memory_release_nb.py
+++ b/tests/test_memory_release_nb.py
@@ -42,9 +42,6 @@ def new_exit(self, exc_type, exc_value, traceback):
     return new_exit
 
 
-@pytest.mark.skip(
-    reason="skip. this started failing after we removed the matplotlib<3.7 pin"
-)
 def test_if_memory_leak_within_notebook(path_notebook):
     """
     epsilon is an amount of memory that is negligeable with respect
diff --git a/tests/test_testing.py b/tests/test_testing.py
index 52ffd8e..eb65f0f 100644
--- a/tests/test_testing.py
+++ b/tests/test_testing.py
@@ -31,9 +31,6 @@ def edit_nb(cells):
     nbformat.write(nb, "nb.ipynb")
 
 
-@pytest.mark.skip(
-    reason="skip. this started failing after we removed the matplotlib<3.7 pin"
-)
 def test_no_outputs(tmp_empty):
     make_and_execute_nb(["x = 1", "y = 2"])