diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 83a360327..79c271f43 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -3,7 +3,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "mambaforge-22.9"
+    python: "mambaforge-23.11"
 conda:
   environment: docs/rtd_environment.yml
 sphinx:
diff --git a/docs/rtd_environment.yml b/docs/rtd_environment.yml
index 7eae4aad6..50572dca7 100644
--- a/docs/rtd_environment.yml
+++ b/docs/rtd_environment.yml
@@ -2,6 +2,7 @@ name: dpdata
 channels:
   - conda-forge
 dependencies:
-  - mamba
+  - python <3.13
+  - mamba <2
   - pip:
     - ..[docs]