diff --git a/keystoneclient/tests/unit/v3/test_credentials.py b/keystoneclient/tests/unit/v3/test_credentials.py
index 75435417e..0efc3dfbf 100644
--- a/keystoneclient/tests/unit/v3/test_credentials.py
+++ b/keystoneclient/tests/unit/v3/test_credentials.py
@@ -31,25 +31,3 @@ class CredentialTests(utils.ClientTestCase, utils.CrudTests):
         kwargs.setdefault('type', uuid.uuid4().hex)
         kwargs.setdefault('user_id', uuid.uuid4().hex)
         return kwargs
-
-    @staticmethod
-    def _ref_data_not_blob(ref):
-        ret_ref = ref.copy()
-        ret_ref['data'] = ref['blob']
-        del ret_ref['blob']
-        return ret_ref
-
-    def test_create_data_not_blob(self):
-        # Test create operation with previous, deprecated "data" argument,
-        # which should be translated into "blob" at the API call level
-        self.deprecations.expect_deprecations()
-        req_ref = self.new_ref()
-        api_ref = self._ref_data_not_blob(req_ref)
-        req_ref.pop('id')
-        self.test_create(api_ref, req_ref)
-
-    def test_update_data_not_blob(self):
-        # Likewise test update operation with data instead of blob argument
-        req_ref = self.new_ref()
-        api_ref = self._ref_data_not_blob(req_ref)
-        self.test_update(api_ref, req_ref)
diff --git a/keystoneclient/v3/credentials.py b/keystoneclient/v3/credentials.py
index a651a0890..80eb38b39 100644
--- a/keystoneclient/v3/credentials.py
+++ b/keystoneclient/v3/credentials.py
@@ -14,11 +14,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from debtcollector import renames
 from positional import positional
 
 from keystoneclient import base
-from keystoneclient.i18n import _
 
 
 class Credential(base.Resource):
@@ -43,22 +41,8 @@ class CredentialManager(base.CrudManager):
     collection_key = 'credentials'
     key = 'credential'
 
-    def _get_data_blob(self, blob, data):
-        # Ref bug #1259461, the <= 0.4.1 keystoneclient calling convention was
-        # to pass "data", but the underlying API expects "blob", so
-        # support both in the python API for backwards compatibility
-        if blob is not None:
-            return blob
-        elif data is not None:
-            return data
-        else:
-            raise ValueError(
-                _("Credential requires blob to be specified"))
-
-    @renames.renamed_kwarg('data', 'blob', version='1.7.0',
-                           removal_version='2.0.0')
     @positional(1, enforcement=positional.WARN)
-    def create(self, user, type, blob=None, data=None, project=None, **kwargs):
+    def create(self, user, type, blob, project=None, **kwargs):
         """Create a credential.
 
         :param user: the user to which the credential belongs
@@ -67,8 +51,6 @@ class CredentialManager(base.CrudManager):
                          ``ec2``, ``cert`` or ``totp``
         :param str blob: the arbitrary blob of the credential data, to be
                          parsed according to the type
-        :param JSON data: Deprecated as of the 1.7.0 release in favor of blob
-                          and may be removed in the future release.
         :param project: the project which limits the scope of the credential,
                         this attribbute is mandatory if the credential type is
                         ec2
@@ -78,13 +60,12 @@ class CredentialManager(base.CrudManager):
 
         :returns: the created credential
         :rtype: :class:`keystoneclient.v3.credentials.Credential`
-        :raises ValueError: if one of ``blob`` or ``data`` is not specified
 
         """
         return super(CredentialManager, self).create(
             user_id=base.getid(user),
             type=type,
-            blob=self._get_data_blob(blob, data),
+            blob=blob,
             project_id=base.getid(project),
             **kwargs)
 
@@ -114,11 +95,9 @@ class CredentialManager(base.CrudManager):
         """
         return super(CredentialManager, self).list(**kwargs)
 
-    @renames.renamed_kwarg('data', 'blob', version='1.7.0',
-                           removal_version='2.0.0')
     @positional(2, enforcement=positional.WARN)
-    def update(self, credential, user, type=None, blob=None, data=None,
-               project=None, **kwargs):
+    def update(self, credential, user, type=None, blob=None, project=None,
+               **kwargs):
         """Update a credential.
 
         :param credential: the credential to be updated on the server
@@ -129,7 +108,6 @@ class CredentialManager(base.CrudManager):
         :param str type: the new type of the credential, valid values are:
                          ``ec2``, ``cert`` or ``totp``
         :param str blob: the new blob of the credential data
-        :param JSON data: Deprecated as of the 1.7.0 release in favor of blob
                           and may be removed in the future release.
         :param project: the new project which limits the scope of the
                         credential, this attribute is mandatory if the
@@ -146,7 +124,7 @@ class CredentialManager(base.CrudManager):
             credential_id=base.getid(credential),
             user_id=base.getid(user),
             type=type,
-            blob=self._get_data_blob(blob, data),
+            blob=blob,
             project_id=base.getid(project),
             **kwargs)
 
diff --git a/releasenotes/notes/remove-credentials-data-46ab3c3c248047cf.yaml b/releasenotes/notes/remove-credentials-data-46ab3c3c248047cf.yaml
new file mode 100644
index 000000000..01ebe3e10
--- /dev/null
+++ b/releasenotes/notes/remove-credentials-data-46ab3c3c248047cf.yaml
@@ -0,0 +1,8 @@
+---
+prelude: >
+    The ``data`` argument for creating and updating credentials has
+    been removed.
+other:
+  - The ``data`` argument for creating and updating credentials was
+    deprecated in the 1.7.0 release. It has been replaced by the
+    ``blob`` argument.