diff --git a/doc/developer/.readthedocs.yaml b/doc/developer/.readthedocs.yaml
index 113672fadb..603a7a3e06 100644
--- a/doc/developer/.readthedocs.yaml
+++ b/doc/developer/.readthedocs.yaml
@@ -7,6 +7,10 @@ build:
   tools:
     python: "3.11"
 
+python:
+  install:
+    - requirements: requirements.txt
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: doc/developer/conf.py
diff --git a/doc/developer/requirements.txt b/doc/developer/requirements.txt
new file mode 100644
index 0000000000..483a4e9600
--- /dev/null
+++ b/doc/developer/requirements.txt
@@ -0,0 +1 @@
+sphinx_rtd_theme
diff --git a/doc/user/.readthedocs.yaml b/doc/user/.readthedocs.yaml
index c5a11dab17..affe75e14c 100644
--- a/doc/user/.readthedocs.yaml
+++ b/doc/user/.readthedocs.yaml
@@ -7,6 +7,9 @@ build:
   tools:
     python: "3.11"
 
+python:
+  install:
+    - requirements: requirements.txt
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: doc/user/conf.py
diff --git a/doc/user/requirements.txt b/doc/user/requirements.txt
new file mode 100644
index 0000000000..483a4e9600
--- /dev/null
+++ b/doc/user/requirements.txt
@@ -0,0 +1 @@
+sphinx_rtd_theme