diff --git a/docs/environment.yml b/docs/environment.yml
index b0a80ffac..0820b4271 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -1,7 +1,7 @@
 name: dpdata
 channels:
   - https://repo.mamba.pm/emscripten-forge
-  - https://repo.mamba.pm/conda-forge
+  - conda-forge
 dependencies:
   - numpy
   - scipy
diff --git a/docs/rtd_environment.yml b/docs/rtd_environment.yml
index 1e9288d56..559dd38aa 100644
--- a/docs/rtd_environment.yml
+++ b/docs/rtd_environment.yml
@@ -2,5 +2,7 @@ name: dpdata
 channels:
   - conda-forge
 dependencies:
+  - python 3.11.*
+  - pip
   - pip:
     - ..[docs]