diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index a901b97..64e0424 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -1,4 +1,4 @@
-name: Build and test [Python 3.7, 3.8]
+name: Build and test [Python 3.7, 3.8, 3.9]
 
 on: [push, pull_request]
 
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
       - name: Checkout
diff --git a/.github/workflows/check_jupyterbook.yml b/.github/workflows/check_jupyterbook.yml
index 375fcfb..0fa9d08 100644
--- a/.github/workflows/check_jupyterbook.yml
+++ b/.github/workflows/check_jupyterbook.yml
@@ -15,7 +15,7 @@ jobs:
         with:
           activate-environment: scf
           environment-file: environment.yml
-          python-version: 3.8
+          python-version: 3.9
           auto-activate-base: false
 
       - name: Build  # Build Jupyter Book
diff --git a/.github/workflows/deploy_jupyterbook.yml b/.github/workflows/deploy_jupyterbook.yml
index 0a849a1..fd887b9 100644
--- a/.github/workflows/deploy_jupyterbook.yml
+++ b/.github/workflows/deploy_jupyterbook.yml
@@ -18,7 +18,7 @@ jobs:
         with:
           activate-environment: scf
           environment-file: environment.yml
-          python-version: 3.8
+          python-version: 3.9
           auto-activate-base: false
 
       - name: Build  # Build Jupyter Book
diff --git a/.github/workflows/linting.yml b/.github/workflows/linting.yml
index 95982f1..a16ca99 100644
--- a/.github/workflows/linting.yml
+++ b/.github/workflows/linting.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
       - name: Checkout