diff --git a/.changes/unreleased/Fixes-20230830-164611.yaml b/.changes/unreleased/Fixes-20230830-164611.yaml
new file mode 100644
index 000000000..ba8d47c01
--- /dev/null
+++ b/.changes/unreleased/Fixes-20230830-164611.yaml
@@ -0,0 +1,6 @@
+kind: Fixes
+body: Fix to support removal of hologram, remove unused IAMDuration encoder
+time: 2023-08-30T16:46:11.83975-04:00
+custom:
+  Author: gshank
+  Issue: "591"
diff --git a/dbt/adapters/redshift/connections.py b/dbt/adapters/redshift/connections.py
index 500de430f..83d05b587 100644
--- a/dbt/adapters/redshift/connections.py
+++ b/dbt/adapters/redshift/connections.py
@@ -1,7 +1,7 @@
 import re
 from multiprocessing import Lock
 from contextlib import contextmanager
-from typing import NewType, Tuple, Union, Optional, List
+from typing import Tuple, Union, Optional, List
 from dataclasses import dataclass, field
 
 import agate
@@ -12,7 +12,7 @@
 from dbt.adapters.sql import SQLConnectionManager
 from dbt.contracts.connection import AdapterResponse, Connection, Credentials
 from dbt.contracts.util import Replaceable
-from dbt.dataclass_schema import FieldEncoder, dbtClassMixin, StrEnum, ValidationError
+from dbt.dataclass_schema import dbtClassMixin, StrEnum, ValidationError
 from dbt.events import AdapterLogger
 from dbt.exceptions import DbtRuntimeError, CompilationError
 import dbt.flags
@@ -36,18 +36,6 @@ def get_message(self) -> str:
 drop_lock: Lock = dbt.flags.MP_CONTEXT.Lock()  # type: ignore
 
 
-IAMDuration = NewType("IAMDuration", int)
-
-
-class IAMDurationEncoder(FieldEncoder):
-    @property
-    def json_schema(self):
-        return {"type": "integer", "minimum": 0, "maximum": 65535}
-
-
-dbtClassMixin.register_field_encoders({IAMDuration: IAMDurationEncoder()})
-
-
 class RedshiftConnectionMethod(StrEnum):
     DATABASE = "database"
     IAM = "iam"