diff --git a/README.md b/README.md
index 76f6d43..200ae9c 100644
--- a/README.md
+++ b/README.md
@@ -158,47 +158,9 @@ Section 2, paragraph 7, nit:
 +                                    +   ^
 ```
 
-### Using caches
-
-In order to speed up the process, and to operate while being offline, you can
-set various environment variables to point the tool at directories in which you
-[cache various IETF document via
-`rsync`](https://www.ietf.org/standards/ids/internet-draft-mirror-sites/).
-
-These environment variables are named:
-
-* `IETF_CHARTERS`
-* `IETF_CONFLICT_REVIEWS`
-* `IETF_IDS`
-* `IETF_RFCS`
-* `IETF_STATUS_CHANGES`
-
-When the tool finds a given item to review in the cache, it will refrain from
-downloading it from the web.
-
-Note that the tool will **not** place items into the cache directories when they are not present; you **will** need to update the cache via `rsync`.
-
 ## Acknowledgments
 
 The ideas for some of these tools came from some of Henrik Levkowetz's earlier
 `bash` scripts. In the case of the `strip` tool, most of the original regular
 expressions were taken from his
 [`rfcstrip`](https://tools.ietf.org/tools/rfcstrip/about) `awk` script.
-
-
-## License
-
-Copyright (C) 2021-2022  Lars Eggert
-
-This program is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free Software
-Foundation; either version 2 of the License, or (at your option) any later
-version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License along with
-this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
-Street, Fifth Floor, Boston, MA  02110-1301, USA.
diff --git a/pyproject.toml b/pyproject.toml
index 50b4286..a6a522b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ietf-reviewtool"
-version = "0.4.0"
+version = "0.4.1"
 description = "Review tool for IETF documents"
 authors = ["Lars Eggert <lars@eggert.org>"]
 readme = "README.md"
@@ -9,7 +9,7 @@ repository = "https://github.com/larseggert/ietf-reviewtool"
 license = "GPL-2.0-only"
 
 [tool.poetry.dependencies]
-python = ">=3.10, <4"
+python = ">=3.11, <4"
 requests-cache = ">=1.0.0"
 appdirs = ">=1.4.4"
 click = ">=7.1.2"