diff --git a/openedx/core/djangoapps/content/search/api.py b/openedx/core/djangoapps/content/search/api.py
index 9b57a9c709..b3614e9cc6 100644
--- a/openedx/core/djangoapps/content/search/api.py
+++ b/openedx/core/djangoapps/content/search/api.py
@@ -760,7 +760,7 @@ def update_library_components_collections(
 
     Because there may be a lot of components, we send these updates to Meilisearch in batches.
     """
-    library_key = collection_key.library_key
+    library_key = collection_key.lib_key
     library = lib_api.get_library(library_key)
     components = authoring_api.get_collection_components(
         library.learning_package_id,
@@ -795,7 +795,7 @@ def update_library_containers_collections(
 
     Because there may be a lot of containers, we send these updates to Meilisearch in batches.
     """
-    library_key = collection_key.library_key
+    library_key = collection_key.lib_key
     library = lib_api.get_library(library_key)
     containers = authoring_api.get_collection_containers(
         library.learning_package_id,
diff --git a/openedx/core/djangoapps/content/search/documents.py b/openedx/core/djangoapps/content/search/documents.py
index 110c400219..6a40f049bf 100644
--- a/openedx/core/djangoapps/content/search/documents.py
+++ b/openedx/core/djangoapps/content/search/documents.py
@@ -8,7 +8,7 @@ from hashlib import blake2b
 
 from django.core.exceptions import ObjectDoesNotExist
 from django.utils.text import slugify
-from opaque_keys.edx.keys import LearningContextKey, UsageKey, OpaqueKey
+from opaque_keys.edx.keys import ContainerKey, LearningContextKey, UsageKey, OpaqueKey
 from opaque_keys.edx.locator import LibraryCollectionLocator, LibraryContainerLocator
 from openedx_learning.api import authoring as authoring_api
 from openedx_learning.api.authoring_models import Collection
@@ -523,7 +523,7 @@ def searchable_doc_for_collection(
         ).count()
 
         doc.update({
-            Fields.context_key: str(collection_key.library_key),
+            Fields.context_key: str(collection_key.context_key),
             Fields.org: str(collection_key.org),
             Fields.usage_key: str(collection_key),
             Fields.block_id: collection.key,
@@ -536,7 +536,7 @@ def searchable_doc_for_collection(
             Fields.published: {
                 Fields.published_num_children: published_num_children,
             },
-            Fields.access_id: _meili_access_id_from_context_key(collection_key.library_key),
+            Fields.access_id: _meili_access_id_from_context_key(collection_key.context_key),
             Fields.breadcrumbs: [{"display_name": collection.learning_package.title}],
         })
 
@@ -549,7 +549,7 @@ def searchable_doc_for_collection(
 
 
 def searchable_doc_for_container(
-    container_key: LibraryContainerLocator,
+    container_key: ContainerKey,
 ) -> dict:
     """
     Generate a dictionary document suitable for ingestion into a search engine
@@ -562,7 +562,7 @@ def searchable_doc_for_container(
     """
     doc = {
         Fields.id: meili_id_from_opaque_key(container_key),
-        Fields.context_key: str(container_key.library_key),
+        Fields.context_key: str(container_key.context_key),
         Fields.org: str(container_key.org),
         # In the future, this may be either course_container or library_container
         Fields.type: DocType.library_container,
@@ -570,7 +570,7 @@ def searchable_doc_for_container(
         Fields.block_type: container_key.container_type,
         Fields.usage_key: str(container_key),  # Field name isn't exact but this is the closest match
         Fields.block_id: container_key.container_id,  # Field name isn't exact but this is the closest match
-        Fields.access_id: _meili_access_id_from_context_key(container_key.library_key),
+        Fields.access_id: _meili_access_id_from_context_key(container_key.context_key),
         Fields.publish_status: PublishStatus.never,
         Fields.last_published: None,
     }
@@ -596,7 +596,7 @@ def searchable_doc_for_container(
         Fields.publish_status: publish_status,
         Fields.last_published: container.last_published.timestamp() if container.last_published else None,
     })
-    library = lib_api.get_library(container_key.library_key)
+    library = lib_api.get_library(container_key.context_key)
     if library:
         doc[Fields.breadcrumbs] = [{"display_name": library.title}]
 
diff --git a/openedx/core/djangoapps/content/search/tasks.py b/openedx/core/djangoapps/content/search/tasks.py
index a1d47fc6f9..1ab77aba38 100644
--- a/openedx/core/djangoapps/content/search/tasks.py
+++ b/openedx/core/djangoapps/content/search/tasks.py
@@ -98,7 +98,7 @@ def update_library_collection_index_doc(collection_key_str: str) -> None:
     Celery task to update the content index document for a library collection
     """
     collection_key = LibraryCollectionLocator.from_string(collection_key_str)
-    library_key = collection_key.library_key
+    library_key = collection_key.lib_key
 
     log.info("Updating content index documents for collection %s in library%s", collection_key, library_key)
 
@@ -112,7 +112,7 @@ def update_library_components_collections(collection_key_str: str) -> None:
     Celery task to update the "collections" field for components in the given content library collection.
     """
     collection_key = LibraryCollectionLocator.from_string(collection_key_str)
-    library_key = collection_key.library_key
+    library_key = collection_key.lib_key
 
     log.info("Updating document.collections for library %s collection %s components", library_key, collection_key)
 
@@ -126,7 +126,7 @@ def update_library_containers_collections(collection_key_str: str) -> None:
     Celery task to update the "collections" field for containers in the given content library collection.
     """
     collection_key = LibraryCollectionLocator.from_string(collection_key_str)
-    library_key = collection_key.library_key
+    library_key = collection_key.lib_key
 
     log.info("Updating document.collections for library %s collection %s containers", library_key, collection_key)
 
@@ -140,7 +140,7 @@ def update_library_container_index_doc(container_key_str: str) -> None:
     Celery task to update the content index document for a library container
     """
     container_key = LibraryContainerLocator.from_string(container_key_str)
-    library_key = container_key.library_key
+    library_key = container_key.lib_key
 
     log.info("Updating content index documents for container %s in library%s", container_key, library_key)
 
diff --git a/openedx/core/djangoapps/content_libraries/api/collections.py b/openedx/core/djangoapps/content_libraries/api/collections.py
index 8e20710ab8..2b0ddc08d8 100644
--- a/openedx/core/djangoapps/content_libraries/api/collections.py
+++ b/openedx/core/djangoapps/content_libraries/api/collections.py
@@ -251,7 +251,7 @@ def get_library_collection_from_locator(
     """
     Return a Collection using the LibraryCollectionLocator
     """
-    library_key = collection_locator.library_key
+    library_key = collection_locator.lib_key
     collection_key = collection_locator.collection_id
     content_library = ContentLibrary.objects.get_by_key(library_key)  # type: ignore[attr-defined]
     assert content_library.learning_package_id is not None  # shouldn't happen but it's technically possible.
diff --git a/openedx/core/djangoapps/content_libraries/api/containers.py b/openedx/core/djangoapps/content_libraries/api/containers.py
index 393755ed1c..b04a43a970 100644
--- a/openedx/core/djangoapps/content_libraries/api/containers.py
+++ b/openedx/core/djangoapps/content_libraries/api/containers.py
@@ -179,7 +179,7 @@ def get_container_from_key(container_key: LibraryContainerLocator, isDeleted=Fal
     Raises ContentLibraryContainerNotFound if no container found, or if the container has been soft deleted.
     """
     assert isinstance(container_key, LibraryContainerLocator)
-    content_library = ContentLibrary.objects.get_by_key(container_key.library_key)
+    content_library = ContentLibrary.objects.get_by_key(container_key.lib_key)
     learning_package = content_library.learning_package
     assert learning_package is not None
     container = authoring_api.get_container_by_key(
@@ -204,7 +204,7 @@ def get_container(container_key: LibraryContainerLocator, include_collections=Fa
     else:
         associated_collections = None
     container_meta = ContainerMetadata.from_container(
-        container_key.library_key,
+        container_key.lib_key,
         container,
         associated_collections=associated_collections,
     )
@@ -268,7 +268,7 @@ def update_container(
     Update a container (e.g. a Unit) title.
     """
     container = get_container_from_key(container_key)
-    library_key = container_key.library_key
+    library_key = container_key.lib_key
 
     assert container.unit
     unit_version = authoring_api.create_next_unit_version(
@@ -295,7 +295,7 @@ def delete_container(
 
     No-op if container doesn't exist or has already been soft-deleted.
     """
-    library_key = container_key.library_key
+    library_key = container_key.lib_key
     container = get_container_from_key(container_key)
 
     affected_collections = authoring_api.get_entity_collections(
@@ -330,7 +330,7 @@ def restore_container(container_key: LibraryContainerLocator) -> None:
     """
     Restore the specified library container.
     """
-    library_key = container_key.library_key
+    library_key = container_key.lib_key
     container = get_container_from_key(container_key, isDeleted=True)
 
     affected_collections = authoring_api.get_entity_collections(
@@ -380,13 +380,13 @@ def get_container_children(
     if container_key.container_type == ContainerType.Unit.value:
         child_components = authoring_api.get_components_in_unit(container.unit, published=published)
         return [LibraryXBlockMetadata.from_component(
-            container_key.library_key,
+            container_key.lib_key,
             entry.component
         ) for entry in child_components]
     else:
         child_entities = authoring_api.get_entities_in_container(container, published=published)
         return [ContainerMetadata.from_container(
-            container_key.library_key,
+            container_key.lib_key,
             entry.entity
         ) for entry in child_entities]
 
@@ -411,7 +411,7 @@ def update_container_children(
     """
     Adds children components or containers to given container.
     """
-    library_key = container_key.library_key
+    library_key = container_key.lib_key
     container_type = container_key.container_type
     container = get_container_from_key(container_key)
     match container_type:
@@ -459,7 +459,7 @@ def publish_container_changes(container_key: LibraryContainerLocator, user_id: i
     containers/blocks.
     """
     container = get_container_from_key(container_key)
-    library_key = container_key.library_key
+    library_key = container_key.lib_key
     content_library = ContentLibrary.objects.get_by_key(library_key)  # type: ignore[attr-defined]
     learning_package = content_library.learning_package
     assert learning_package
diff --git a/openedx/core/djangoapps/content_libraries/rest_api/containers.py b/openedx/core/djangoapps/content_libraries/rest_api/containers.py
index cd1b7602fb..061f4a0693 100644
--- a/openedx/core/djangoapps/content_libraries/rest_api/containers.py
+++ b/openedx/core/djangoapps/content_libraries/rest_api/containers.py
@@ -77,7 +77,7 @@ class LibraryContainerView(GenericAPIView):
         Get information about a container
         """
         api.require_permission_for_library_key(
-            container_key.library_key,
+            container_key.lib_key,
             request.user,
             permissions.CAN_VIEW_THIS_CONTENT_LIBRARY,
         )
@@ -94,7 +94,7 @@ class LibraryContainerView(GenericAPIView):
         Update a Container.
         """
         api.require_permission_for_library_key(
-            container_key.library_key,
+            container_key.lib_key,
             request.user,
             permissions.CAN_EDIT_THIS_CONTENT_LIBRARY,
         )
@@ -115,7 +115,7 @@ class LibraryContainerView(GenericAPIView):
         Delete a Container (soft delete).
         """
         api.require_permission_for_library_key(
-            container_key.library_key,
+            container_key.lib_key,
             request.user,
             permissions.CAN_EDIT_THIS_CONTENT_LIBRARY,
         )
@@ -180,7 +180,7 @@ class LibraryContainerChildrenView(GenericAPIView):
         """
         published = request.GET.get('published', False)
         api.require_permission_for_library_key(
-            container_key.library_key,
+            container_key.lib_key,
             request.user,
             permissions.CAN_VIEW_THIS_CONTENT_LIBRARY,
         )
@@ -201,7 +201,7 @@ class LibraryContainerChildrenView(GenericAPIView):
         Helper function to update children in container.
         """
         api.require_permission_for_library_key(
-            container_key.library_key,
+            container_key.lib_key,
             request.user,
             permissions.CAN_EDIT_THIS_CONTENT_LIBRARY,
         )
@@ -288,7 +288,7 @@ class LibraryContainerRestore(GenericAPIView):
         Restores a soft-deleted library container
         """
         api.require_permission_for_library_key(
-            container_key.library_key,
+            container_key.lib_key,
             request.user,
             permissions.CAN_EDIT_THIS_CONTENT_LIBRARY,
         )
@@ -310,7 +310,7 @@ class LibraryContainerCollectionsView(GenericAPIView):
         Collection and Components must all be part of the given library/learning package.
         """
         content_library = api.require_permission_for_library_key(
-            container_key.library_key,
+            container_key.lib_key,
             request.user,
             permissions.CAN_EDIT_THIS_CONTENT_LIBRARY
         )
@@ -320,7 +320,7 @@ class LibraryContainerCollectionsView(GenericAPIView):
 
         collection_keys = serializer.validated_data['collection_keys']
         api.set_library_item_collections(
-            library_key=container_key.library_key,
+            library_key=container_key.lib_key,
             publishable_entity=container.publishable_entity,
             collection_keys=collection_keys,
             created_by=request.user.id,
@@ -342,7 +342,7 @@ class LibraryContainerPublishView(GenericAPIView):
         Publish the container and its children
         """
         api.require_permission_for_library_key(
-            container_key.library_key,
+            container_key.lib_key,
             request.user,
             permissions.CAN_EDIT_THIS_CONTENT_LIBRARY,
         )
diff --git a/openedx/core/djangoapps/content_libraries/rest_api/serializers.py b/openedx/core/djangoapps/content_libraries/rest_api/serializers.py
index 707c45d8ce..be386e0e9d 100644
--- a/openedx/core/djangoapps/content_libraries/rest_api/serializers.py
+++ b/openedx/core/djangoapps/content_libraries/rest_api/serializers.py
@@ -7,8 +7,7 @@ from rest_framework import serializers
 from rest_framework.exceptions import ValidationError
 
 from opaque_keys import OpaqueKey
-from opaque_keys.edx.keys import UsageKeyV2
-from opaque_keys.edx.locator import LibraryContainerLocator
+from opaque_keys.edx.locator import LibraryContainerLocator, LibraryUsageLocatorV2
 from opaque_keys import InvalidKeyError
 
 from openedx_learning.api.authoring_models import Collection
@@ -319,22 +318,22 @@ class ContentLibraryCollectionUpdateSerializer(serializers.Serializer):
 
 class UsageKeyV2Serializer(serializers.BaseSerializer):
     """
-    Serializes a UsageKeyV2.
+    Serializes a library Component (XBlock) key.
     """
-    def to_representation(self, value: UsageKeyV2) -> str:
+    def to_representation(self, value: LibraryUsageLocatorV2) -> str:
         """
-        Returns the UsageKeyV2 value as a string.
+        Returns the LibraryUsageLocatorV2 value as a string.
         """
         return str(value)
 
-    def to_internal_value(self, value: str) -> UsageKeyV2:
+    def to_internal_value(self, value: str) -> LibraryUsageLocatorV2:
         """
-        Returns a UsageKeyV2 from the string value.
+        Returns a LibraryUsageLocatorV2 from the string value.
 
-        Raises ValidationError if invalid UsageKeyV2.
+        Raises ValidationError if invalid LibraryUsageLocatorV2.
         """
         try:
-            return UsageKeyV2.from_string(value)
+            return LibraryUsageLocatorV2.from_string(value)
         except InvalidKeyError as err:
             raise ValidationError from err
 
@@ -359,12 +358,12 @@ class OpaqueKeySerializer(serializers.BaseSerializer):
 
     def to_internal_value(self, value: str) -> OpaqueKey:
         """
-        Returns a UsageKeyV2 or a LibraryContainerLocator from the string value.
+        Returns a LibraryUsageLocatorV2 or a LibraryContainerLocator from the string value.
 
         Raises ValidationError if invalid UsageKeyV2 or LibraryContainerLocator.
         """
         try:
-            return UsageKeyV2.from_string(value)
+            return LibraryUsageLocatorV2.from_string(value)
         except InvalidKeyError:
             try:
                 return LibraryContainerLocator.from_string(value)
diff --git a/openedx/core/djangoapps/content_tagging/api.py b/openedx/core/djangoapps/content_tagging/api.py
index 9163ebd58a..5f4130c842 100644
--- a/openedx/core/djangoapps/content_tagging/api.py
+++ b/openedx/core/djangoapps/content_tagging/api.py
@@ -7,12 +7,11 @@ import io
 from itertools import groupby
 import csv
 from typing import Iterator
-from opaque_keys.edx.keys import UsageKey
+from opaque_keys.edx.keys import CourseKey, CollectionKey, ContainerKey, UsageKey
 
 import openedx_tagging.core.tagging.api as oel_tagging
 from django.db.models import Exists, OuterRef, Q, QuerySet
 from django.utils.timezone import now
-from opaque_keys.edx.keys import CourseKey, LibraryItemKey
 from opaque_keys.edx.locator import LibraryLocatorV2
 from openedx_tagging.core.tagging.models import ObjectTag, Taxonomy
 from openedx_tagging.core.tagging.models.utils import TAGS_CSV_SEPARATOR
@@ -230,8 +229,8 @@ def generate_csv_rows(object_id, buffer) -> Iterator[str]:
     """
     content_key = get_content_key_from_string(object_id)
 
-    if isinstance(content_key, (UsageKey, LibraryItemKey)):
-        raise ValueError("The object_id must be a CourseKey or a LibraryLocatorV2.")
+    if isinstance(content_key, (UsageKey, CollectionKey, ContainerKey)):
+        raise ValueError("The object_id must be a component, collection, or container.")
 
     all_object_tags, taxonomies = get_all_object_tags(content_key)
     tagged_content = build_object_tree_with_objecttags(content_key, all_object_tags)
diff --git a/openedx/core/djangoapps/content_tagging/types.py b/openedx/core/djangoapps/content_tagging/types.py
index 3684e57053..6e54caa051 100644
--- a/openedx/core/djangoapps/content_tagging/types.py
+++ b/openedx/core/djangoapps/content_tagging/types.py
@@ -5,11 +5,11 @@ from __future__ import annotations
 
 from typing import Dict, List, Union
 
-from opaque_keys.edx.keys import CourseKey, UsageKey, LibraryItemKey
+from opaque_keys.edx.keys import CourseKey, UsageKey, CollectionKey, ContainerKey
 from opaque_keys.edx.locator import LibraryLocatorV2
 from openedx_tagging.core.tagging.models import Taxonomy
 
-ContentKey = Union[LibraryLocatorV2, CourseKey, UsageKey, LibraryItemKey]
+ContentKey = Union[LibraryLocatorV2, CourseKey, UsageKey, CollectionKey, ContainerKey]
 ContextKey = Union[LibraryLocatorV2, CourseKey]
 
 TagValuesByTaxonomyIdDict = Dict[int, List[str]]
diff --git a/openedx/core/djangoapps/content_tagging/utils.py b/openedx/core/djangoapps/content_tagging/utils.py
index 419b960927..f6e4883251 100644
--- a/openedx/core/djangoapps/content_tagging/utils.py
+++ b/openedx/core/djangoapps/content_tagging/utils.py
@@ -5,7 +5,7 @@ from __future__ import annotations
 
 from edx_django_utils.cache import RequestCache
 from opaque_keys import InvalidKeyError
-from opaque_keys.edx.keys import CourseKey, UsageKey, LibraryItemKey
+from opaque_keys.edx.keys import CourseKey, CollectionKey, ContainerKey, UsageKey
 from opaque_keys.edx.locator import LibraryLocatorV2
 from openedx_tagging.core.tagging.models import Taxonomy
 from organizations.models import Organization
@@ -18,22 +18,16 @@ def get_content_key_from_string(key_str: str) -> ContentKey:
     """
     Get content key from string
     """
-    try:
-        return CourseKey.from_string(key_str)
-    except InvalidKeyError:
+    for key_type in (LibraryLocatorV2, CourseKey, UsageKey, ContainerKey, CollectionKey):
         try:
-            return LibraryLocatorV2.from_string(key_str)
+            return key_type.from_string(key_str)
         except InvalidKeyError:
-            try:
-                return UsageKey.from_string(key_str)
-            except InvalidKeyError:
-                try:
-                    return LibraryItemKey.from_string(key_str)
-                except InvalidKeyError as usage_key_error:
-                    raise ValueError(
-                        "object_id must be one of the following "
-                        "keys: CourseKey, LibraryLocatorV2, UsageKey or LibraryItemKey"
-                    ) from usage_key_error
+            continue
+    raise ValueError(
+        "For tagging, object_id must be one of the following "
+        "key types: LibraryLocatorV2, CourseKey, UsageKey, ContainerKey, CollectionKey. "
+        f"got: {key_str}"
+    )
 
 
 def get_context_key_from_key(content_key: ContentKey) -> ContextKey:
@@ -41,20 +35,11 @@ def get_context_key_from_key(content_key: ContentKey) -> ContextKey:
     Returns the context key from a given content key.
     """
     # If the content key is a CourseKey or a LibraryLocatorV2, return it
-    if isinstance(content_key, (CourseKey, LibraryLocatorV2)):
+    if isinstance(content_key, (LibraryLocatorV2, CourseKey)):
         return content_key
-
-    # If the content key is a LibraryItemKey, return the LibraryLocatorV2
-    if isinstance(content_key, LibraryItemKey):
-        return content_key.library_key
-
-    # If the content key is a UsageKey, return the context key
-    context_key = content_key.context_key
-
-    if isinstance(context_key, (CourseKey, LibraryLocatorV2)):
-        return context_key
-
-    raise ValueError("context must be a CourseKey or a LibraryLocatorV2")
+    else:
+        assert isinstance(content_key.context_key, (CourseKey, LibraryLocatorV2))  # for type checker
+        return content_key.context_key
 
 
 def get_context_key_from_key_string(key_str: str) -> ContextKey:
diff --git a/requirements/edx/base.txt b/requirements/edx/base.txt
index e19edf6e32..5d1b25a092 100644
--- a/requirements/edx/base.txt
+++ b/requirements/edx/base.txt
@@ -478,7 +478,7 @@ edx-milestones==0.6.0
     # via -r requirements/edx/kernel.in
 edx-name-affirmation==3.0.1
     # via -r requirements/edx/kernel.in
-edx-opaque-keys[django]==2.12.0
+edx-opaque-keys[django]==3.0.0
     # via
     #   -r requirements/edx/kernel.in
     #   edx-bulk-grades
diff --git a/requirements/edx/development.txt b/requirements/edx/development.txt
index 5840e5bdcd..dea264a70c 100644
--- a/requirements/edx/development.txt
+++ b/requirements/edx/development.txt
@@ -767,7 +767,7 @@ edx-name-affirmation==3.0.1
     # via
     #   -r requirements/edx/doc.txt
     #   -r requirements/edx/testing.txt
-edx-opaque-keys[django]==2.12.0
+edx-opaque-keys[django]==3.0.0
     # via
     #   -r requirements/edx/doc.txt
     #   -r requirements/edx/testing.txt
diff --git a/requirements/edx/doc.txt b/requirements/edx/doc.txt
index 96c941c445..57d9b52ee1 100644
--- a/requirements/edx/doc.txt
+++ b/requirements/edx/doc.txt
@@ -562,7 +562,7 @@ edx-milestones==0.6.0
     # via -r requirements/edx/base.txt
 edx-name-affirmation==3.0.1
     # via -r requirements/edx/base.txt
-edx-opaque-keys[django]==2.12.0
+edx-opaque-keys[django]==3.0.0
     # via
     #   -r requirements/edx/base.txt
     #   edx-bulk-grades
diff --git a/requirements/edx/testing.txt b/requirements/edx/testing.txt
index 101011f92c..d117630253 100644
--- a/requirements/edx/testing.txt
+++ b/requirements/edx/testing.txt
@@ -589,7 +589,7 @@ edx-milestones==0.6.0
     # via -r requirements/edx/base.txt
 edx-name-affirmation==3.0.1
     # via -r requirements/edx/base.txt
-edx-opaque-keys[django]==2.12.0
+edx-opaque-keys[django]==3.0.0
     # via
     #   -r requirements/edx/base.txt
     #   edx-bulk-grades