diff --git a/pkgs/development/python-modules/icalevents/default.nix b/pkgs/development/python-modules/icalevents/default.nix
index f8f211b65993..41b6f1bd34f7 100644
--- a/pkgs/development/python-modules/icalevents/default.nix
+++ b/pkgs/development/python-modules/icalevents/default.nix
@@ -4,6 +4,7 @@
 , pythonOlder
 , pytestCheckHook
 , poetry-core
+, pythonRelaxDepsHook
 , datetime
 , httplib2
 , icalendar
@@ -27,6 +28,7 @@ buildPythonPackage rec {
 
   nativeBuildInputs = [
     poetry-core
+    pythonRelaxDepsHook
   ];
 
   propagatedBuildInputs = [
@@ -37,6 +39,13 @@ buildPythonPackage rec {
     pytz
   ];
 
+  pythonRelaxDeps = [
+    "datetime"
+    "httplib2"
+    "icalendar"
+    "pytz"
+  ];
+
   nativeCheckInputs = [
     pytestCheckHook
   ];