diff --git a/pkgs/development/python-modules/exchangelib/default.nix b/pkgs/development/python-modules/exchangelib/default.nix
index c41b04790836..c568583dd378 100644
--- a/pkgs/development/python-modules/exchangelib/default.nix
+++ b/pkgs/development/python-modules/exchangelib/default.nix
@@ -1,40 +1,77 @@
-{ lib, fetchFromGitHub, buildPythonPackage,
-  pythonOlder,
-  lxml, tzlocal, python-dateutil, pygments, requests-kerberos,
-  defusedxml, cached-property, isodate, requests_ntlm, dnspython,
-  psutil, requests-mock, pyyaml,
-  oauthlib, requests_oauthlib, tzdata,
-  flake8, backports-zoneinfo
+{ lib
+, backports-datetime-fromisoformat
+, backports-zoneinfo
+, buildPythonPackage
+, cached-property
+, defusedxml
+, dnspython
+, fetchFromGitHub
+, flake8
+, isodate
+, lxml
+, oauthlib
+, psutil
+, pygments
+, python-dateutil
+, pythonOlder
+, pytz
+, pyyaml
+, requests
+, requests_ntlm
+, requests_oauthlib
+, requests-kerberos
+, requests-mock
+, tzdata
+, tzlocal
 }:
 
 buildPythonPackage rec {
   pname = "exchangelib";
-  version = "4.4.0";
-  disabled = pythonOlder "3.5";
+  version = "4.5.0";
+  disabled = pythonOlder "3.6";
 
-  # tests are not present in the PyPI version
   src = fetchFromGitHub {
     owner = "ecederstrand";
     repo = pname;
     rev = "v${version}";
-    sha256 = "0d6hfbawp68x18ryxamkamf8kgc55xbrll89g3swrqnm2rrhzrqf";
+    sha256 = "sha256-MtWcqsbKls9I7Oj0UlJzWtHsNfAxk4+ojSgK50ljEfs=";
   };
 
-  checkInputs = [ psutil requests-mock pyyaml
-    flake8
-  ];
   propagatedBuildInputs = [
-    lxml tzlocal tzdata python-dateutil pygments requests-kerberos
-    defusedxml cached-property isodate requests_ntlm dnspython
-    oauthlib requests_oauthlib
+    cached-property
+    defusedxml
+    dnspython
+    isodate
+    lxml
+    oauthlib
+    pygments
+    requests
+    requests_ntlm
+    requests_oauthlib
+    requests-kerberos
+    tzdata
+    tzlocal
   ] ++ lib.optionals (pythonOlder "3.9") [
     backports-zoneinfo
+  ] ++ lib.optionals (pythonOlder "3.7") [
+    backports-datetime-fromisoformat
   ];
 
+  checkInputs = [
+    flake8
+    psutil
+    python-dateutil
+    pytz
+    pyyaml
+    requests-mock
+  ];
+
+  pythonImportsCheck = [ "exchangelib" ];
+
   meta = with lib; {
     description = "Client for Microsoft Exchange Web Services (EWS)";
-    homepage    = "https://github.com/ecederstrand/exchangelib";
-    license     = licenses.bsd2;
+    homepage = "https://github.com/ecederstrand/exchangelib";
+    license = licenses.bsd2;
     maintainers = with maintainers; [ catern ];
   };
 }