diff --git a/docs/rtd_environment.yml b/docs/rtd_environment.yml
index 114c292d0..54fb700ca 100644
--- a/docs/rtd_environment.yml
+++ b/docs/rtd_environment.yml
@@ -1,8 +1,8 @@
 name: xtensor-docs
 
 channels:
-  - conda-forge
+- conda-forge
 
 dependencies:
-  - breathe
-  - sphinx_rtd_theme
+- breathe
+- sphinx_rtd_theme
diff --git a/readthedocs.yml b/readthedocs.yml
index 6cc465c9b..f21130321 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -1,9 +1,9 @@
 version: 2
 
 build:
-  os: "ubuntu-22.04"
+  os: ubuntu-22.04
   tools:
-    python: "mambaforge-22.9"
+    python: mambaforge-22.9
 
 conda:
   environment: docs/rtd_environment.yml