diff --git a/.readthedocs.yaml b/.readthedocs.yaml
new file mode 100644
index 0000000..d73b56e
--- /dev/null
+++ b/.readthedocs.yaml
@@ -0,0 +1,12 @@
+version: 2
+build:
+  os: "ubuntu-20.04"
+  tools:
+    python: "3.8"
+sphinx:
+  configuration: docs/conf.py
+python:
+  install:
+    - requirements: docs/requirements.txt
+    - method: pip
+      path: .
diff --git a/ChangeLog b/ChangeLog
index 09dc3cc..6caf1d8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,16 +1,24 @@
 CHANGES
 =======
 
-v2.0.1
-------
-
+* rtd
+* rtd
+* rtd
+* typo
+* rtd updates
+* remove old python versions
+* try to fix docs theme
+* try to fix docs theme
+* ChangeLog
 * fix docs issue
-
-v2.0.0
-------
-
 * ChangeLog
 * v2.0 release (#11)
+* update README
+* v2.0 release candidate (fixes #9, fixes #9) (#10)
+* update Pipfile.lock
+* reformatted all code w/ black
+* update deprecated import and reformat w/ black
+* Bump bleach from 3.2.1 to 3.3.0
 
 v1.0.4
 ------
diff --git a/cfitall/providers/filesystem.py b/cfitall/providers/filesystem.py
index 18e8096..a1695bd 100644
--- a/cfitall/providers/filesystem.py
+++ b/cfitall/providers/filesystem.py
@@ -21,7 +21,7 @@ class FilesystemProvider(ConfigProviderBase):
     prefix: str
 
     def __init__(
-        self, path: list[str], prefix: str, provider_name: str = "filesystem"
+        self, path: List[str], prefix: str, provider_name: str = "filesystem"
     ) -> None:
         """
         FilesystemProvider attempts to read json or yaml configuration files
diff --git a/cfitall/registry.py b/cfitall/registry.py
index 2d154ed..e78bdfc 100644
--- a/cfitall/registry.py
+++ b/cfitall/registry.py
@@ -72,7 +72,7 @@ def all(self) -> Dict:
         return values
 
     @property
-    def config_keys(self) -> list[str]:
+    def config_keys(self) -> List[str]:
         """
         Returns a list of currently used configuration keys as dotted paths, for
         use with the get() or set() methods.
@@ -88,7 +88,7 @@ def dict(self) -> Dict:
         return self._merge_configs()
 
     @property
-    def env_vars(self) -> list[str]:
+    def env_vars(self) -> List[str]:
         """
         Returns a list of environment variables known from config files and defaults
         """
diff --git a/docs/conf.py b/docs/conf.py
index 4b5048f..93d3c34 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -15,9 +15,9 @@
 
 import sphinx_rtd_theme
 
-here = os.path.dirname(os.path.abspath(__file__))
-cfitall_path = os.path.join(here, "..", "cfitall")
-sys.path.insert(0, cfitall_path)
+# here = os.path.dirname(os.path.abspath(__file__))
+# cfitall_path = os.path.join(here, "..", "cfitall")
+# sys.path.insert(0, cfitall_path)
 print(sys.path)
 
 
diff --git a/setup.cfg b/setup.cfg
index ee68012..0bc7dc1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,17 +4,19 @@ author = Chris Haumesser
 author-email = chris.haumesser@gmail.com
 summary = a configuration manager for python apps
 description-file = README.rst
-requires-python = >=3.6
+requires-python = >=3.8
 home-page = https://github.com/wryfi/cfitall
 classifier =
     License :: OSI Approved :: MIT License
     Natural Language :: English
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
 
 [options]
 packages = find:
+install_requires =
+    PyYAML <=6
 
 [files]
 data_files =