diff --git a/requirements-dev.txt b/requirements-dev.txt
index 0c89c6d53..27389a792 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,7 +1,5 @@
-# bottle 0.12.17 changed behavior
-# https://github.com/pycurl/pycurl/issues/573
-bottle
 flaky
+flask
 pyflakes
 pytest>=5
 sphinx
diff --git a/tests/app.py b/tests/app.py
index 62ff5744c..ea847ad5f 100644
--- a/tests/app.py
+++ b/tests/app.py
@@ -2,7 +2,7 @@
 # vi:ts=4:et
 
 import time as _time, sys
-import bottle
+import flask
 try:
     import json
 except ImportError:
@@ -10,7 +10,7 @@
 
 py3 = sys.version_info[0] == 3
 
-app = bottle.Bottle()
+app = flask.Flask(__name__)
 app.debug = True
 
 @app.route('/success')
@@ -24,62 +24,47 @@ def short_wait():
 
 @app.route('/status/403')
 def forbidden():
-    return bottle.HTTPResponse('forbidden', 403)
+    return flask.Response('forbidden', 403)
 
 @app.route('/status/404')
 def not_found():
-    return bottle.HTTPResponse('not found', 404)
+    return flask.Response('not found', 404)
 
-@app.route('/postfields', method='get')
-@app.route('/postfields', method='post')
+@app.route('/postfields', methods=['GET', 'POST'])
 def postfields():
-    return json.dumps(dict(bottle.request.forms))
+    return json.dumps(dict(flask.request.form))
 
-@app.route('/raw_utf8', method='post')
+@app.route('/raw_utf8', methods=['POST'])
 def raw_utf8():
-    data = bottle.request.body.getvalue().decode('utf8')
+    data = flask.request.data.decode('utf8')
     return json.dumps(data)
 
-# XXX file is not a bottle FileUpload instance, but FieldStorage?
 def xconvert_file(key, file):
     return {
         'key': key,
         'name': file.name,
-        'raw_filename': file.raw_filename,
+        'filename': file.filename,
         'headers': file.headers,
         'content_type': file.content_type,
         'content_length': file.content_length,
         'data': file.read(),
     }
 
-if hasattr(bottle, 'FileUpload'):
-    # bottle 0.12
-    def convert_file(key, file):
-        return {
-            'name': file.name,
-            # file.filename lowercases the file name
-            # https://github.com/defnull/bottle/issues/582
-            # raw_filenames is a string on python 3
-            'filename': file.raw_filename,
-            'data': file.file.read().decode(),
-        }
-else:
-    # bottle 0.11
-    def convert_file(key, file):
-        return {
-            'name': file.name,
-            'filename': file.filename,
-            'data': file.file.read().decode(),
-        }
-
-@app.route('/files', method='post')
+def convert_file(key, file):
+    return {
+        'name': file.name,
+        'filename': file.filename,
+        'data': file.read().decode(),
+    }
+
+@app.route('/files', methods=['POST'])
 def files():
-    files = [convert_file(key, bottle.request.files[key]) for key in bottle.request.files]
+    files = [convert_file(key, flask.request.files[key]) for key in flask.request.files]
     return json.dumps(files)
 
 @app.route('/header')
 def header():
-    return bottle.request.headers.get(bottle.request.query['h'], '')
+    return flask.request.headers.get(flask.request.args['h'], '')
 
 # This is a hacky endpoint to test non-ascii text being given to libcurl
 # via headers.
@@ -89,7 +74,7 @@ def header():
 # Thanks to bdarnell for the idea: https://github.com/pycurl/pycurl/issues/124
 @app.route('/header_utf8')
 def header_utf8():
-    header_value = bottle.request.headers.get(bottle.request.query['h'], '' if py3 else b'')
+    header_value = flask.request.headers.get(flask.request.args['h'], '' if py3 else b'')
     if py3:
         # header_value is a string, headers are decoded in latin1
         header_value = header_value.encode('latin1').decode('utf8')
@@ -98,13 +83,9 @@ def header_utf8():
         header_value = header_value.decode('utf8')
     return header_value
 
-@app.route('/param_utf8_hack', method='post')
+@app.route('/param_utf8_hack', methods=['POST'])
 def param_utf8_hack():
-    param = bottle.request.forms['p']
-    if py3:
-        # python 3 decodes bytes as latin1 perhaps?
-        # apply the latin1-utf8 hack
-        param = param.encode('latin').decode('utf8')
+    param = flask.request.form['p']
     return param
 
 def pause_writer(interval):
@@ -127,19 +108,25 @@ def utf8_body():
 
 @app.route('/invalid_utf8_body')
 def invalid_utf8_body():
-    # bottle encodes the body
-    raise bottle.HTTPResponse(b'\xb3\xd2\xda\xcd\xd7', 200)
+    return flask.Response(b'\xb3\xd2\xda\xcd\xd7', 200)
 
 @app.route('/set_cookie_invalid_utf8')
 def set_cookie_invalid_utf8():
-    bottle.response.set_header('Set-Cookie', '\xb3\xd2\xda\xcd\xd7=%96%A6g%9Ay%B0%A5g%A7tm%7C%95%9A')
-    return 'cookie set'
+    response = flask.Response('cookie set')
+    # WARNING: The original bottle test passed '\xb3\xd2\xda\xcd\xd7...' as string
+    # Presumably bottle encoded that as utf-8 in the response.
+    # Flask on the other hand encodes such strings as latin-1 (chars in == bytes out).
+    # In order to make the test pass I replicate the original bottle behavior by utf-8->latin1 roundtrip.
+    response.headers['Set-Cookie'] = '\xb3\xd2\xda\xcd\xd7=%96%A6g%9Ay%B0%A5g%A7tm%7C%95%9A'.encode('utf-8').decode('latin-1')
+    return response
 
 @app.route('/content_type_invalid_utf8')
 def content_type_invalid_utf8():
-    bottle.response.set_header('Content-Type', '\xb3\xd2\xda\xcd\xd7')
-    return 'content type set'
+    response = flask.Response('content type set')
+    # See the WARNING in set_cookie_invalid_utf8
+    response.headers['Content-Type'] = '\xb3\xd2\xda\xcd\xd7'.encode('utf-8').decode('latin-1')
+    return response
 
 @app.route('/status_invalid_utf8')
 def status_invalid_utf8():
-    raise bottle.HTTPResponse('status set', '555 \xb3\xd2\xda\xcd\xd7')
+    raise flask.Response('status set', b'555 \xb3\xd2\xda\xcd\xd7')
diff --git a/tests/runwsgi.py b/tests/runwsgi.py
index ff00b8cac..b072b73ad 100644
--- a/tests/runwsgi.py
+++ b/tests/runwsgi.py
@@ -1,6 +1,5 @@
 # Run a WSGI application in a daemon thread
 
-import bottle
 import threading
 import os.path
 
@@ -8,7 +7,14 @@
 
 global_stop = False
 
-class Server(bottle.WSGIRefServer):
+class Server:
+    quiet = False
+
+    def __init__(self, host, port, **options):
+        self.options = options
+        self.host = host
+        self.port = int(port)
+
     def run(self, handler): # pragma: no cover
         self.srv = self.make_server(handler)
         self.serve()
@@ -66,7 +72,7 @@ def __init__(self, app, port, server, server_kwargs):
         self.server = server(host='127.0.0.1', port=self.port, **self.server_kwargs)
 
     def run(self):
-        bottle.run(self.app, server=self.server, quiet=True)
+        self.server.run(self.app)
 
 started_servers = {}