diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3b01fa26..27749284 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -161,8 +161,7 @@ jobs:
     - name: Install Python dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install .
-        pip install -r docs/add-requirements.txt
+        pip install .[docs]
     - name: Check documentation for errors
       run: |
         SPHINXOPTS="-a -E -n -W --keep-going" make -C docs html
diff --git a/sdk/.readthedocs.yaml b/sdk/.readthedocs.yaml
index e64e5daa..1085208a 100644
--- a/sdk/.readthedocs.yaml
+++ b/sdk/.readthedocs.yaml
@@ -15,4 +15,5 @@ python:
   install:
     - method: pip
       path: .
-    - requirements: docs/add-requirements.txt
+      extra_requirements:
+        - docs
diff --git a/sdk/docs/add-requirements.txt b/sdk/docs/add-requirements.txt
deleted file mode 100644
index 6ac2c147..00000000
--- a/sdk/docs/add-requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-# Additional requirements for building the docs
-sphinx~=8.2
-sphinx-rtd-theme~=3.0
-sphinx-argparse~=0.5.0
diff --git a/sdk/pyproject.toml b/sdk/pyproject.toml
index baaf6ff0..3a9fb683 100644
--- a/sdk/pyproject.toml
+++ b/sdk/pyproject.toml
@@ -55,6 +55,11 @@ dev = [
     "types-python-dateutil",
     "lxml-stubs~=0.5.1",
 ]
+docs= [
+    "sphinx~=8.2",
+    "sphinx-rtd-theme~=3.0",
+    "sphinx-argparse~=0.5.0"
+]
 
 [project.urls]
 "Homepage" = "https://github.com/eclipse-basyx/basyx-python-sdk"