diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 90a05be3b..bc7a96d6f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -5,6 +5,9 @@ concurrency:
   group: ${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
+env:
+  CONDA_EXE: mamba
+
 on:
   push:
     branches:
@@ -24,18 +27,20 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
-        python-version: ['3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
 
     steps:
       - uses: actions/checkout@v2
       - uses: conda-incubator/setup-miniconda@v2
         with:
-          auto-update-conda: true
+          auto-update-conda: false
           python-version: ${{ matrix.python-version }}
+          channels: conda-forge,nodefaults
+          mamba-version: "*"
 
       - name: Install core dependencies.
         shell: bash -l {0}
-        run: conda install -c conda-forge tox-conda coverage
+        run: mamba install -c conda-forge tox-conda coverage
 
       # Unit, integration, and end-to-end tests.
 
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ddebfe6d9..0af449743 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -77,7 +77,6 @@ repos:
     hooks:
     -   id: refurb
         args: [--ignore, FURB126]
-        language_version: python3.10
 -   repo: https://github.com/executablebooks/mdformat
     rev: 0.7.16
     hooks:
diff --git a/tests/test_debugging.py b/tests/test_debugging.py
index 65f41ae6a..c0a505665 100644
--- a/tests/test_debugging.py
+++ b/tests/test_debugging.py
@@ -172,6 +172,7 @@ def task_example():
 
 
 @pytest.mark.end_to_end
+@pytest.mark.xfail(reason="#312")
 @pytest.mark.skipif(not IS_PEXPECT_INSTALLED, reason="pexpect is not installed.")
 @pytest.mark.skipif(sys.platform == "win32", reason="pexpect cannot spawn on Windows.")
 def test_pdb_interaction_capturing_simple(tmp_path):
@@ -283,6 +284,7 @@ def task_2():
 
 
 @pytest.mark.end_to_end
+@pytest.mark.xfail(reason="#312")
 @pytest.mark.skipif(not IS_PEXPECT_INSTALLED, reason="pexpect is not installed.")
 @pytest.mark.skipif(sys.platform == "win32", reason="pexpect cannot spawn on Windows.")
 def test_pdb_interaction_capturing_twice(tmp_path):
diff --git a/tox.ini b/tox.ini
index ad1ea9d8a..3df181d89 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ conda_deps =
     pytest
     pytest-cov
     pytest-xdist
-    coverage <=6.4.0
+    coverage
 
     # Package dependencies
     attrs