diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 15be6542..12b6be2a 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -11,14 +11,16 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v2
+      - uses: conda-incubator/setup-miniconda@v2
         with:
-          python-version: 3.8
-
-      - name: Install dependencies
-        run: |
-          python -m pip install -r requirements.txt
+          channels: conda-forge,nodefaults
+          channel-priority: strict
+          mamba-version: '*'
+          activate-environment: pythia
+          auto-update-conda: false
+          python-version: 3.9
+          environment-file: ci/environment.yml
+          use-only-tar-bz2: true
 
       - name: Build
         run: |
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 402d9b9e..17ab997d 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,10 +1,11 @@
 # Required
 version: 2
 
-sphinx:
-  configuration: content/conf.py
+build:
+  image: latest
+
+conda:
+  environment: ci/environment.yml
 
-python:
-  version: 3.8
-  install:
-    - requirements: requirements.txt
+sphinx:
+  fail_on_warning: false
diff --git a/ci/environment.yml b/ci/environment.yml
index cd8bc2f0..054aa465 100644
--- a/ci/environment.yml
+++ b/ci/environment.yml
@@ -1,8 +1,9 @@
 name: pythia
 channels:
   - conda-forge
+  - nodefaults
 dependencies:
-  - myst-nb==0.10.1
+  - myst-nb==0.12.3
   - sphinx-book-theme
   - sphinx-panels
   - matplotlib
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 4eb50845..00000000
--- a/requirements.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-myst-nb==0.10.1
-sphinx-book-theme
-sphinx-panels
-matplotlib
-pandas
-pyyaml