diff --git a/docs/source/conf.py b/docs/source/conf.py
index 29d36d9c4..aed3fddff 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -63,6 +63,14 @@ latex_elements = {
 extensions.append('sphinx.ext.todo')
 todo_include_todos = False
 
+# attempt to get version
+env_yosys_ver = os.getenv("YOSYS_VER")
+if env_yosys_ver:
+    if os.getenv("READTHEDOCS") and os.getenv("READTHEDOCS_VERSION") == "latest":
+        release = env_yosys_ver + "-dev"
+    else:
+        release = env_yosys_ver
+
 # custom cmd-ref parsing/linking
 sys.path += [os.path.dirname(__file__) + "/../"]
 extensions.append('util.cmdref')