Pin mkdocs dependency to 0.17.3
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 0c7e331..816765a 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -15,6 +15,6 @@
   configuration: mkdocs.yml
 
 # Optionally declare the Python requirements required to build your docs
-# python:
-#    install:
-#    - requirements: requirements.txt
+python:
+   install:
+   - requirements: requirements.txt
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..b0fa54b
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+mkdocs==0.17.3