diff --git a/Doxyfile b/Doxyfile
index dc9b7a34c..8c6c382c5 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = "MESA"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 11701
+PROJECT_NUMBER         = r22.05.1-rc1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/data/version_number b/data/version_number
new file mode 100644
index 000000000..d723792cb
--- /dev/null
+++ b/data/version_number
@@ -0,0 +1 @@
+r22.05.1-rc1
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 3aa0e0b4f..d17de0c13 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -20,8 +20,8 @@
 project = 'MESA'
 copyright = '2021, The MESA Team'
 author = 'The MESA Team'
-release = 'main'
-version = 'main'
+release = 'r22.05.1-rc1'
+version = 'r22.05.1-rc1'
 
 
 # -- General configuration ---------------------------------------------------