We need one patch on top of 0.3.8 for compatibility with Werkzeug 1.0.

Taken from upstream:
https://github.com/flask-restful/flask-restful/commit/73376a488907af3042b52678ac4c23f8a8911e5b

diff --git a/tests/test_api.py b/tests/test_api.py
index f7f8e661..6795d362 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -445,7 +445,9 @@ def test_handle_non_api_error(self):
 
         resp = app.get("/foo")
         self.assertEquals(resp.status_code, 404)
-        self.assertEquals('text/html', resp.headers['Content-Type'])
+        # in newer versions of werkzeug this is `text/html; charset=utf8`
+        content_type, _, _ = resp.headers['Content-Type'].partition(';')
+        self.assertEquals('text/html', content_type)
 
     def test_non_api_error_404_catchall(self):
         app = Flask(__name__)
diff --git a/tests/test_reqparse.py b/tests/test_reqparse.py
index 2f1fbedf..9776f17c 100644
--- a/tests/test_reqparse.py
+++ b/tests/test_reqparse.py
@@ -2,9 +2,9 @@
 import unittest
 from mock import Mock, patch
 from flask import Flask
-from werkzeug import exceptions, MultiDict
+from werkzeug import exceptions
 from werkzeug.wrappers import Request
-from werkzeug.datastructures import FileStorage
+from werkzeug.datastructures import FileStorage, MultiDict
 from flask_restful.reqparse import Argument, RequestParser, Namespace
 import six
 import decimal
guix/commit/gnu/packages/configuration-management.scm?id=7c06b0abfc0453c361aafaeaf1dda1678b2b744f'>commit</a><a href='/guix/diff/gnu/packages/configuration-management.scm?id=7c06b0abfc0453c361aafaeaf1dda1678b2b744f'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/configuration-management.scm'>
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<div class='path'>path: <a href='/guix/log/?id=7c06b0abfc0453c361aafaeaf1dda1678b2b744f'>root</a>/<a href='/guix/log/gnu?id=7c06b0abfc0453c361aafaeaf1dda1678b2b744f'>gnu</a>/<a href='/guix/log/gnu/packages?id=7c06b0abfc0453c361aafaeaf1dda1678b2b744f'>packages</a>/<a href='/guix/log/gnu/packages/configuration-management.scm?id=7c06b0abfc0453c361aafaeaf1dda1678b2b744f'>configuration-management.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/configuration-management.scm?id=7c06b0abfc0453c361aafaeaf1dda1678b2b744f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-06-21 00:10:50 +0200'>2023-06-21</span></td><td><a href='/guix/commit/gnu/packages/configuration-management.scm?id=da4305e9b3d65cf698a6987bd7be7905785bf06c'>gnu: go-github-com-mattn-go-runewidth: Update to 0.0.14.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/golang.scm (go-github-com-mattn-go-runewidth): Update to 0.0.14.
(go-github.com-mattn-go-runewidth): Remove, and change users to to refer
to 'go-github-com-mattn-go-runewidth'.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Nguyễn Gia Phong</td></tr>
<tr><td><span title='2023-02-07 00:05:53 +0100'>2023-02-07</span></td><td><a href='/guix/commit/gnu/packages/configuration-management.scm?id=19c81c151738e2a548878d63a14fc99a3e91de5d'>gnu: gopkg-in-errgo-fmt-errors: Rename to go-gopkg-in-errgo-fmt-errors.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/golang.scm (gopkg-in-errgo-fmt-errors):
Rename to …
(go-gopkg-in-errgo-fmt-errors): … this.
* gnu/packages/configuration-management.scm (chezmoi)[native-inputs]: Update
accordingly.

Signed-off-by: Christopher Baines &lt;mail@cbaines.net&gt;
</span></span></td><td>Katherine Cox-Buday</td></tr>
<tr><td><span title='2022-11-20 08:31:05 -0500'>2022-11-20</span></td><td><a href='/guix/commit/gnu/packages/configuration-management.scm?id=ae90aaa60cbfd9a05b0d9f9c4d6963187e0fa6e1'>gnu: Rename go-golang-org-colorful to go-github-com-lucasb-eyer-go-colorful.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/golang.scm (go-golang-org-colorful): Deprecate and rename to...
(go-github-com-lucasb-eyer-go-colorful): ...this.
(go-github-com-gdamore-tcell)[inputs]: Rename go-golang-org-colorful to
go-github-com-lucasb-eyer-go-colorful.
(go-github-com-muesli-termenv)[inputs]: Likewise.
(go-github-com-charmbracelet-glamour)[inputs]: Likewise.
(go-github-com-charmbracelet-bubbletea)[inputs]: Likewise.
* gnu/packages/configuration-management.scm (chezmoi)[native-inputs]: Rename
go-golang-org-colorful to go-github-com-lucasb-eyer-go-colorful.
* gnu/packages/image-viewers.scm (pixterm)[inputs]: Likewise.

Signed-off-by: Raghav Gururajan &lt;rg@raghavgururajan.name&gt;
</span></span></td><td>(unmatched-parenthesis</td></tr>