diff --git a/mitmproxy/addons/proxyauth.py b/mitmproxy/addons/proxyauth.py
index 8e90dd088..e656421e1 100644
--- a/mitmproxy/addons/proxyauth.py
+++ b/mitmproxy/addons/proxyauth.py
@@ -115,7 +115,6 @@ class ProxyAuth:
                 conn.search(parts[1][1:], '(' + parts[0] + username + ')', attributes=['objectclass'])
                 if ctx.options.proxyauth.split(":")[3] in conn.entries[0]['objectclass']:
                     return username, password
-
         return None
 
     def authenticate(self, f: http.HTTPFlow) -> bool:
diff --git a/setup.py b/setup.py
index 8f032b37a..c8a1fe206 100644
--- a/setup.py
+++ b/setup.py
@@ -71,7 +71,7 @@ setup(
         "hyperframe>=5.0, <6",
         "jsbeautifier>=1.6.3, <1.7",
         "kaitaistruct>=0.7, <0.8",
-        "ldap3>=2.2.0, <2.2.1",
+        "ldap3>=2.2.0, <2.2.3",
         "passlib>=1.6.5, <1.8",
         "pyasn1>=0.1.9, <0.3",
         "pyOpenSSL>=16.0, <17.1",
diff --git a/test/mitmproxy/addons/test_proxyauth.py b/test/mitmproxy/addons/test_proxyauth.py
index 6311e97e9..fa02d119d 100644
--- a/test/mitmproxy/addons/test_proxyauth.py
+++ b/test/mitmproxy/addons/test_proxyauth.py
@@ -2,6 +2,7 @@ import binascii
 import ldap3
 
 import pytest
+from _pytest.monkeypatch import MonkeyPatch
 
 from mitmproxy import exceptions
 from mitmproxy.addons import proxyauth
@@ -42,16 +43,20 @@ def test_configure():
         ctx.configure(up, proxyauth=None)
         assert not up.nonanonymous
 
-        ctx.configure(up, proxyauth="ldap:ldap.forumsys.com:uid=?,dc=example,dc=com:person")
+        ctx.configure(up, proxyauth="ldap:fake_server:fake_dn:fake_group")
         assert up.ldapserver
-        ctx.configure(up, proxyauth="ldaps:ldap.forumsys.com:uid=?,dc=example,dc=com:person")
+
+
+        ctx.configure(up, proxyauth="ldap:fake_server:uid=?,dc=example,dc=com:person")
+        assert up.ldapserver
+        ctx.configure(up, proxyauth="ldaps:fake_server.com:uid=?,dc=example,dc=com:person")
         assert up.ldapserver
 
         with pytest.raises(exceptions.OptionsError):
-            ctx.configure(up, proxyauth="ldap:ldap.forumsys.comuid=?dc=example,dc=com:person")
+            ctx.configure(up, proxyauth="ldap:fake_serveruid=?dc=example,dc=com:person")
 
         with pytest.raises(exceptions.OptionsError):
-            ctx.configure(up, proxyauth="ldapssssssss:ldap.forumsys.com:uid=?,dc=example,dc=com:person")
+            ctx.configure(up, proxyauth="ldapssssssss:fake_server.com:uid=?,dc=example,dc=com:person")
 
         with pytest.raises(exceptions.OptionsError):
             ctx.configure(
@@ -79,7 +84,7 @@ def test_configure():
             ctx.configure(up, proxyauth="any", mode="socks5")
 
 
-def test_check():
+def test_check(monkeypatch):
     up = proxyauth.ProxyAuth()
     with taddons.context() as ctx:
         ctx.configure(up, proxyauth="any", mode="regular")
@@ -121,23 +126,25 @@ def test_check():
         )
         assert not up.check(f)
 
+
         ctx.configure(
             up,
-            proxyauth="ldap:ldap.forumsys.com:uid=?,dc=example,dc=com:person"
+            proxyauth="ldap:fake-server:cn=?,ou=test,o=lab:test"
         )
+        conn = ldap3.Connection("fake-server", user="cn=user0,ou=test,o=lab", password="password", client_strategy=ldap3.MOCK_SYNC)
+        conn.bind()
+        conn.strategy.add_entry('cn=user0,ou=test,o=lab', {'userPassword': 'test0', 'sn': 'user0_sn', 'revision': 0, 'objectClass': 'test'})
+        def conn_mp(ldap, user, password, **kwargs):
+            return conn
+        monkeypatch.setattr(ldap3, "Connection", conn_mp)
         f.request.headers["Proxy-Authorization"] = proxyauth.mkauth(
-            "einstein", "password"
+            "user0", "test0"
         )
         assert up.check(f)
         f.request.headers["Proxy-Authorization"] = proxyauth.mkauth(
             "", ""
         )
         assert not up.check(f)
-        with pytest.raises(ldap3.core.exceptions.LDAPBindError):
-            f.request.headers["Proxy-Authorization"] = proxyauth.mkauth(
-                "einstein", "foo"
-            )
-            assert not up.check(f)
 
 
 def test_authenticate():