diff --git a/docs/installation/upgrade-300.rst b/docs/installation/upgrade-300.rst
index 3dddadc039..82c096d543 100644
--- a/docs/installation/upgrade-300.rst
+++ b/docs/installation/upgrade-300.rst
@@ -91,6 +91,13 @@ active locale field (``name_nl`` or ``name_en``) during imports. Instead, the
 ``translations`` key existed.  We recommend re-creating the exports on a newer version
 of Open Forms.
 
+Removal of ``formStep`` reference in form logic
+-----------------------------------------------
+
+The ``formStep`` key was deprecated in favour of ``formStepUuid`` and the conversion
+code has been removed. This may affect form exports from before Open Forms 2.1.0. We
+recommend re-creating the exports on a newer version of Open Forms.
+
 Removal of /api/v2/location/get-street-name-and-city endpoint
 =============================================================
 
diff --git a/pyright.pyproject.toml b/pyright.pyproject.toml
index 55892ac49c..4c1a6ed7fd 100644
--- a/pyright.pyproject.toml
+++ b/pyright.pyproject.toml
@@ -24,6 +24,8 @@ include = [
     # Formio tooling
     "src/openforms/formio/typing/",
     "src/openforms/formio/formatters/",
+    # Core forms app
+    "src/openforms/forms/api/serializers/logic/action_serializers.py",
     # Payments
     "src/openforms/payments/models.py",
     # Interaction with the outside world
diff --git a/src/openforms/forms/api/serializers/logic/action_serializers.py b/src/openforms/forms/api/serializers/logic/action_serializers.py
index ddf4f1993f..abba78d6fe 100644
--- a/src/openforms/forms/api/serializers/logic/action_serializers.py
+++ b/src/openforms/forms/api/serializers/logic/action_serializers.py
@@ -1,12 +1,9 @@
-import warnings
 from datetime import date
 
-from django.urls import resolve
 from django.utils.translation import gettext_lazy as _
 
 from drf_polymorphic.serializers import PolymorphicSerializer
 from drf_spectacular.utils import extend_schema_serializer
-from furl import furl
 from json_logic.typing import Primitive
 from rest_framework import serializers
 
@@ -168,18 +165,6 @@ class LogicComponentActionSerializer(serializers.Serializer):
             )
         ),
     )
-    # Deprecated field! form_step_uuid should be used instead
-    form_step = serializers.URLField(
-        allow_null=True,
-        required=False,  # validated against the action.type
-        allow_blank=True,
-        label=_("form step"),
-        help_text=_(
-            "The form step that will be affected by the action. This field is "
-            "required if the action type is `%(action_type)s`, otherwise optional."
-        )
-        % {"action_type": LogicActionTypes.step_not_applicable},
-    )
     form_step_uuid = ActionFormStepUUIDField(
         allow_null=True,
         required=False,  # validated against the action.type
@@ -192,27 +177,17 @@ class LogicComponentActionSerializer(serializers.Serializer):
     )
     action = LogicActionPolymorphicSerializer()
 
-    def validate(self, data: dict) -> dict:
+    def validate(self, attrs: dict) -> dict:
         """
         1. Check that the component is supplied depending on the action type.
         2. Check that the value for date variables has the right format
         """
-        action_type = data.get("action", {}).get("type")
-        action_value = data.get("action", {}).get("value")
-        component = data.get("component")
-        form_step = data.get("form_step")
-
-        if form_step and not data.get("form_step_uuid"):
-            warnings.warn(
-                "Logic action 'formStep' is deprecated, use 'formStepUuid' instead",
-                DeprecationWarning,
-            )
-            # normalize to UUID following deprecation of URL reference
-            match = resolve(furl(form_step).path)
-            data["form_step_uuid"] = match.kwargs["uuid"]
+        action_type = attrs.get("action", {}).get("type")
+        action_value = attrs.get("action", {}).get("value")
+        component = attrs.get("component")
 
-        form_step_uuid = data.get("form_step_uuid")
-        variable = data.get("variable")
+        form_step_uuid = attrs.get("form_step_uuid")
+        variable = attrs.get("variable")
 
         if (
             action_type
@@ -254,7 +229,10 @@ def validate(self, data: dict) -> dict:
 
             if form_var.data_type == FormVariableDataTypes.date:
                 try:
-                    date.fromisoformat(action_value)
+                    # type check muted since we handle it at runtime
+                    date.fromisoformat(
+                        action_value
+                    )  # pyright: ignore[reportArgumentType]
                 except (ValueError, TypeError) as ex:
                     raise serializers.ValidationError(
                         {
@@ -270,7 +248,7 @@ def validate(self, data: dict) -> dict:
         if (
             action_type
             and action_type == LogicActionTypes.step_not_applicable
-            and (not form_step and not form_step_uuid)
+            and not form_step_uuid
         ):
             raise serializers.ValidationError(
                 {
@@ -281,4 +259,4 @@ def validate(self, data: dict) -> dict:
                 code="blank",
             )
 
-        return data
+        return attrs
diff --git a/src/openforms/forms/tests/test_import_export.py b/src/openforms/forms/tests/test_import_export.py
index dd5b178026..d0cad6ee0b 100644
--- a/src/openforms/forms/tests/test_import_export.py
+++ b/src/openforms/forms/tests/test_import_export.py
@@ -873,8 +873,7 @@ def test_import_form_with_disable_step_logic(self):
                     "actions": [
                         {
                             "action": {"type": "step-not-applicable"},
-                            # In versions <= 2.0, we used the url of the form step, but this was replaced with the UUID
-                            "form_step": "http://127.0.0.1:8999/api/v2/forms/324cadce-a627-4e3f-b117-37ca232f16b2/steps/a54864c6-c460-48bd-a520-eced60ffb209",
+                            "form_step_uuid": "a54864c6-c460-48bd-a520-eced60ffb209",
                         }
                     ],
                     "form": "http://testserver/api/v2/forms/324cadce-a627-4e3f-b117-37ca232f16b2",