diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9c157d6..2e87e97 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,10 +10,7 @@ cache:
 
 .install_sphinx:
   before_script:
-  - pip install -U sphinx
-  - pip install -U sphinx-theme-pd
-  - pip install -U reno[sphinx]
-
+  - pip install -U -r docs/requirements.txt
 
 test-docs:
   stage: test
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 0000000..f828e1c
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,5 @@
+reno[sphinx]==3.5.0
+dulwich --global-option='--pure'
+Sphinx==5.1.1
+sphinx-theme-pd==0.8.3
+