diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ba3bbab4..1612b03b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04, ubuntu-18.04, macos-10.15]
-        python-version: [3.5, 3.6, 3.8]
+        python-version: [3.5, 3.6, 3.8, 3.9]
         compiler: [gcc, clang]
         exclude:
           - os: macos-10.15
@@ -25,9 +25,11 @@ jobs:
           - python-version: 3.5
             numpy: 1.11.3
           - python-version: 3.6
-            numpy: 1.19
+            numpy: 1.19.3
           - python-version: 3.8
-            numpy: 1.19
+            numpy: 1.19.3
+          - python-version: 3.9
+            numpy: 1.19.3
     steps:
     - uses: actions/checkout@v2
       with:
@@ -93,5 +95,5 @@ jobs:
         pip install dist/libpy-*.tar.gz
     - name: Check that docs can be built
       run: |
-        pip install sphinx sphinx_rtd_theme breathe ipython
+        pip install wheel sphinx sphinx_rtd_theme breathe ipython
         make docs
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5c550f9f..64c02e1e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -59,7 +59,7 @@ jobs:
 
     - name: Build the docs
       run: |
-        pip install sphinx sphinx_rtd_theme breathe ipython
+        pip install wheel sphinx sphinx_rtd_theme breathe ipython
         make docs
 
     - name: Deploy the docs
diff --git a/setup.py b/setup.py
index 61bc3da9..b692f3c5 100644
--- a/setup.py
+++ b/setup.py
@@ -66,6 +66,7 @@ def run(self):
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: C++',
         'Operating System :: POSIX',