diff --git a/dsp_permissions_scripts/oap/update_iris.py b/dsp_permissions_scripts/oap/update_iris.py
index c967d2e..08d36ad 100644
--- a/dsp_permissions_scripts/oap/update_iris.py
+++ b/dsp_permissions_scripts/oap/update_iris.py
@@ -25,33 +25,34 @@
 @dataclass
 class IRIUpdater(metaclass=ABCMeta):
     iri: str
-    res_dict: dict[str, Any]
+    dsp_client: DspClient
+    res_dict: dict[str, Any] = field(init=False)
     err_msg: str | None = field(init=False, default=None)
 
     @abstractmethod
-    def update_iri(self, new_scope: PermissionScope, dsp_client: DspClient) -> None:
+    def update_iri(self, new_scope: PermissionScope) -> None:
         pass
 
     @staticmethod
     def from_string(string: str, dsp_client: DspClient) -> ResourceIRIUpdater | ValueIRIUpdater:
-        res_iri = re.sub(r"/values/[^/]+$", "", string)
-        res_dict = _get_res_dict(res_iri, dsp_client)
         if re.search(r"^http://rdfh\.ch/[^/]{4}/[^/]{22}/values/[^/]{22}$", string):
-            return ValueIRIUpdater(string, res_dict)
+            return ValueIRIUpdater(string, dsp_client)
         elif re.search(r"^http://rdfh\.ch/[^/]{4}/[^/]{22}$", string):
-            return ResourceIRIUpdater(string, res_dict)
+            return ResourceIRIUpdater(string, dsp_client)
         else:
             raise ValueError(f"Could not parse IRI {string}")
 
-
-@cache
-def _get_res_dict(res_iri: str, dsp_client: DspClient) -> dict[str, Any]:
-    return dsp_client.get(f"/v2/resources/{quote_plus(res_iri, safe='')}")
+    @cache
+    def _get_res_dict(self, res_iri: str) -> dict[str, Any]:
+        return self.dsp_client.get(f"/v2/resources/{quote_plus(res_iri, safe='')}")
 
 
 @dataclass
 class ResourceIRIUpdater(IRIUpdater):
-    def update_iri(self, new_scope: PermissionScope, dsp_client: DspClient) -> None:
+    def __post_init__(self) -> None:
+        self.res_dict = self._get_res_dict(self.iri, self.dsp_client)
+
+    def update_iri(self, new_scope: PermissionScope) -> None:
         try:
             update_permissions_for_resource(
                 resource_iri=self.iri,
@@ -59,7 +60,7 @@ def update_iri(self, new_scope: PermissionScope, dsp_client: DspClient) -> None:
                 resource_type=self.res_dict["@type"],
                 context=self.res_dict["@context"] | {"knora-admin": KNORA_ADMIN_ONTO_NAMESPACE},
                 scope=new_scope,
-                dsp_client=dsp_client,
+                dsp_client=self.dsp_client,
             )
         except ApiError as err:
             self.err_msg = err.message
@@ -68,7 +69,11 @@ def update_iri(self, new_scope: PermissionScope, dsp_client: DspClient) -> None:
 
 @dataclass
 class ValueIRIUpdater(IRIUpdater):
-    def update_iri(self, new_scope: PermissionScope, dsp_client: DspClient) -> None:
+    def __post_init__(self) -> None:
+        res_iri = re.sub(r"/values/[^/]{22}$", "", self.iri)
+        self.res_dict = self._get_res_dict(res_iri, self.dsp_client)
+
+    def update_iri(self, new_scope: PermissionScope) -> None:
         val_oap = next((v for v in get_value_oaps(self.res_dict) if v.value_iri == self.iri), None)
         if not val_oap:
             self.err_msg = f"Could not find value {self.iri} in resource {self.res_dict['@id']}"
@@ -81,7 +86,7 @@ def update_iri(self, new_scope: PermissionScope, dsp_client: DspClient) -> None:
                 value=val_oap,
                 resource_type=self.res_dict["@type"],
                 context=self.res_dict["@context"] | {"knora-admin": KNORA_ADMIN_ONTO_NAMESPACE},
-                dsp_client=dsp_client,
+                dsp_client=self.dsp_client,
             )
         except ApiError as err:
             self.err_msg = err.message
@@ -95,7 +100,7 @@ def update_iris(
 ) -> None:
     iri_updaters = _initialize_iri_updaters(iri_file, dsp_client)
     for iri in iri_updaters:
-        iri.update_iri(new_scope, dsp_client)
+        iri.update_iri(new_scope)
     _tidy_up(iri_updaters, iri_file)