diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 970a1ec..d392d90 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,14 +14,28 @@ jobs:
     - uses: actions/checkout@v2
 
     # Install dependencies
-    - name: Set up Python 3.7
+    - name: Set up Python 3.9
       uses: actions/setup-python@v1
       with:
-        python-version: 3.7
+        python-version: 3.9
         
+    - name: cache installation
+      uses: actions/cache@v2
+      with:
+        path: ${{ env.pythonLocation }}
+        key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py') }}-${{ hashFiles('requirements.txt') }}
+    
     - name: Install dependencies
       run: |
         pip install -r requirements.txt
+        
+    - uses: actions/checkout@master
+    - uses: r-lib/actions/setup-r@v1
+      with:
+        r-version: '4.1' # The R version to download (if necessary) and use.
+    - run: Rscript -e "install.packages('IRkernel')"
+    - run: Rscript -e "IRkernel::installspec()"
+    
     # Build the book
     - name: Build the book
       run: |
diff --git a/requirements.txt b/requirements.txt
index 7e821e4..8b5d5fc 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+jupyter
 jupyter-book
 matplotlib
 numpy