diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index aa209bb21..b0d3b9a1c 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -9,7 +9,8 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.11"
+    python: "mambaforge-4.10"
+    #python: "3.11"
     # You can also specify other tool versions:
     # nodejs: "19"
     # rust: "1.64"
@@ -20,8 +21,8 @@ sphinx:
    configuration: docs/conf.py
 
 # Optionally build your docs in additional formats such as PDF and ePub
-# formats:
-#    - pdf
+formats:
+    - pdf
 #    - epub
 
 # Optional but recommended, declare the Python requirements required
@@ -30,3 +31,6 @@ sphinx:
 # python:
 #    install:
 #    - requirements: docs/requirements.txt
+
+conda:
+    environment: conda-env/readthedocs.yml