diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6e077aba..d5e95a92 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
           auto-update-conda: true
           auto-activate-base: true
           miniconda-version: 'latest'
-          python-version: 3.8
+          python-version: 3.9
           environment-file: environment.yml
           activate-environment: quantecon
       - name: Install latex dependencies
diff --git a/environment.yml b/environment.yml
index cf27341c..760119b6 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,16 +2,22 @@ name: quantecon
 channels:
   - default
 dependencies:
-  - python=3.8
-  - anaconda=2021.11
+  - python=3.9
+  - anaconda=2022.05
   - pip
   - pip:
-    - jupyter-book==0.12.1
-    - quantecon-book-theme==0.3.0
+    - jupyter-book==0.12.3
+    - quantecon-book-theme==0.3.1
     - sphinx-tojupyter==0.2.1
     - sphinxext-rediraffe==0.2.7
     - sphinx-exercise==0.4.0
-    - sphinx-togglebutton
     - ghp-import==1.1.0
-    # Temporary Fixes
-    - networkx==2.6.3
\ No newline at end of file
+    - sphinxcontrib-youtube==1.1.0
+    - sphinx-togglebutton==0.3.1
+    # Sandpit
+    - array-to-latex
+    - PuLP
+    - cvxpy
+    - cvxopt
+    - cylp
+    - prettytable