diff --git a/docs/source/api_reference/clockline.rst b/docs/source/api/clockline.rst
similarity index 100%
rename from docs/source/api_reference/clockline.rst
rename to docs/source/api/clockline.rst
diff --git a/docs/source/api_reference/device.rst b/docs/source/api/device.rst
similarity index 100%
rename from docs/source/api_reference/device.rst
rename to docs/source/api/device.rst
diff --git a/docs/source/api_reference/index.rst b/docs/source/api/index.rst
similarity index 100%
rename from docs/source/api_reference/index.rst
rename to docs/source/api/index.rst
diff --git a/docs/source/api_reference/intermediatedevice.rst b/docs/source/api/intermediatedevice.rst
similarity index 100%
rename from docs/source/api_reference/intermediatedevice.rst
rename to docs/source/api/intermediatedevice.rst
diff --git a/docs/source/api_reference/pseudoclock.rst b/docs/source/api/pseudoclock.rst
similarity index 100%
rename from docs/source/api_reference/pseudoclock.rst
rename to docs/source/api/pseudoclock.rst
diff --git a/docs/source/api_reference/pseudoclockdevice.rst b/docs/source/api/pseudoclockdevice.rst
similarity index 100%
rename from docs/source/api_reference/pseudoclockdevice.rst
rename to docs/source/api/pseudoclockdevice.rst
diff --git a/docs/source/conf.py b/docs/source/conf.py
index f74c0b6..df5f266 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -132,8 +132,10 @@
 
 # whether to use stable or latest version
 labscript_suite_doc_version = os.environ.get('READTHEDOCS_VERSION', 'latest')
-if labscript_suite_doc_version not in ['stable', 'latest']:
+if '.' in labscript_suite_doc_version:
     labscript_suite_doc_version = 'stable'
+elif labscript_suite_doc_version not in ['stable', 'latest']:
+    labscript_suite_doc_version = 'latest'
 
 # add intersphinx references for each component
 for ls_prog in labscript_suite_programs:
@@ -204,7 +206,7 @@ def setup(app):
     app.add_config_value('m2r_anonymous_references', False, 'env')
     app.add_config_value('m2r_disable_inline_math', False, 'env')
     app.add_directive('mdinclude', MdInclude)
-    app.add_stylesheet('custom.css')
+    app.add_css_file('custom.css')
 
     # generate the components.rst file dynamically so it points to stable/latest
     # of subprojects correctly
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 6921780..cf14658 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -15,7 +15,7 @@ labscript
 
    introduction
    connection_table
-   api_reference/index
+   api/index
 
 .. toctree::
    :maxdepth: 2