diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f8d85d07..a94dd20c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -32,13 +32,13 @@ jobs:
 
       - name: Install dependencies (python)
         run: |
-          python -m pip install --upgrade pip wheel twine codecov "sphinx>4,<5" nbsphinx ipython ipykernel "pydata-sphinx-theme<0.9" requests sphinx-copybutton xarray matplotlib
+          python -m pip install --upgrade pip wheel twine codecov "sphinx>5,<6" nbsphinx ipython ipykernel "pydata-sphinx-theme<0.9" requests sphinx-copybutton xarray matplotlib
           pip install -r requirements.txt
           pip install -e .
 
       - name: Install CmdStan
         run: |
-          python -m cmdstanpy.install_cmdstan
+          python -m cmdstanpy.install_cmdstan --verbose --cores 4
 
       - name: Setup git identity
         run: |
diff --git a/docsrc/env.yml b/docsrc/env.yml
index 271feecb..b15d9ef4 100644
--- a/docsrc/env.yml
+++ b/docsrc/env.yml
@@ -10,7 +10,7 @@ dependencies:
   - numpy>=1.15
   - pandas
   - xarray
-  - sphinx>4,<5
+  - sphinx>5,<6
   - nbsphinx
   - pydata-sphinx-theme>0.7,<0.9
   - sphinx-copybutton