diff --git a/readthedocs.yml b/.readthedocs.yaml
similarity index 58%
rename from readthedocs.yml
rename to .readthedocs.yaml
index 6b2525b385..7405c1d64e 100644
--- a/readthedocs.yml
+++ b/.readthedocs.yaml
@@ -1,7 +1,8 @@
 version: 2
 
-conda:
-    environment: sphinx-doc/environment.yml
+python:
+   install:
+   - requirements: sphinx-doc/requirements.txt
 
 sphinx:
   configuration: sphinx-doc/conf.py
@@ -11,9 +12,9 @@ formats:
   - htmlzip
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-22.04
   tools:
-    python: mambaforge-4.10
+    python: "3.11"
 
 submodules:
   include: all
diff --git a/sphinx-doc/environment.yml b/sphinx-doc/environment.yml
deleted file mode 100644
index fa2cef0fa0..0000000000
--- a/sphinx-doc/environment.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-channels:
-  - conda-forge
-dependencies:
-  - python==3.10
-  - sphinx
-  - sphinx_rtd_theme
-  - ipython
-  - ipython_genutils
-  - numpy
-  - h5py
-  - tornado
-  - pandoc
-  - nbconvert
-  - nbsphinx
diff --git a/sphinx-doc/requirements.txt b/sphinx-doc/requirements.txt
new file mode 100644
index 0000000000..f571a3ab04
--- /dev/null
+++ b/sphinx-doc/requirements.txt
@@ -0,0 +1,10 @@
+h5py
+ipython
+ipython_genutils
+nbconvert
+nbsphinx
+numpy
+pandoc
+sphinx>=4.3.0
+sphinx-rtd-theme>=0.5.1
+tornado