diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index ff2d94da..82a4fa09 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -7,3 +7,8 @@ build:
 
 conda:
   environment: environment.yml
+
+python:
+  install:
+    - method: setuptools
+      path: .
diff --git a/environment.yml b/environment.yml
index 8c132109..4b5348b5 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,6 +6,7 @@ dependencies:
 - pip
 - python=3.9.*
 - libgdal=3.4.*
+- cython=3
 - sphinx-click
 - sphinx-rtd-theme
 - pip: