diff --git a/poetry.lock b/poetry.lock
index bf85d0c6..f083e735 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1353,22 +1353,20 @@ files = [
 
 [[package]]
 name = "singer-sdk"
-version = "0.39.1"
+version = "0.39.1.post9.dev0+477a5eb6"
 description = "A framework for building Singer taps"
 optional = false
 python-versions = ">=3.8"
-files = [
-    {file = "singer_sdk-0.39.1-py3-none-any.whl", hash = "sha256:0c66709678d36f584db313f19c64c7d3b443c6879e5e476b2934918581fb213e"},
-    {file = "singer_sdk-0.39.1.tar.gz", hash = "sha256:1616ac22c6917ddf2267a53e8802c10247a5e742bfb284e9dc9632ef9dc50ca4"},
-]
+files = []
+develop = false
 
 [package.dependencies]
 backoff = {version = ">=2.0.0", markers = "python_version < \"4\""}
 backports-datetime-fromisoformat = {version = ">=2.0.1", markers = "python_version < \"3.11\""}
-click = ">=8.0,<9.0"
+click = "~=8.0"
 fs = ">=2.4.16"
 importlib-metadata = {version = "<9.0.0", markers = "python_version < \"3.12\""}
-importlib-resources = {version = ">=5.12.0,<6.2.0 || >6.2.0,<6.3.0 || >6.3.0,<6.3.1 || >6.3.1", markers = "python_version < \"3.10\""}
+importlib-resources = {version = ">=5.12.0,!=6.2.0,!=6.3.0,!=6.3.1", markers = "python_version < \"3.10\""}
 inflection = ">=0.5.1"
 joblib = ">=1.3.0"
 jsonpath-ng = ">=1.5.3"
@@ -1390,7 +1388,13 @@ faker = ["faker (>=22.5,<27.0)"]
 jwt = ["PyJWT (>=2.4,<3.0)", "cryptography (>=3.4.6)"]
 parquet = ["numpy (>=1.22)", "numpy (>=1.22,<1.25)", "pyarrow (>=13)"]
 s3 = ["fs-s3fs (>=1.1.1)"]
-testing = ["pytest (>=7.2.1)", "pytest-durations (>=1.2.0)"]
+testing = ["pytest (>=7.2.1)"]
+
+[package.source]
+type = "git"
+url = "https://github.com/meltano/sdk.git"
+reference = "HEAD"
+resolved_reference = "477a5eb6879b9e133f1b43b821c26d590ab183bf"
 
 [[package]]
 name = "six"
@@ -1662,4 +1666,4 @@ test = ["big-O", "importlib-resources", "jaraco.functools", "jaraco.itertools",
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8"
-content-hash = "83bc02126c6ed34a108072042f3ce6fce2318c760d325d40e263fcccca79b73d"
+content-hash = "92dea30a2c973b3f72aa6c0a185be78f6cf9a650a6b59704790c5a39b323ad2c"
diff --git a/pyproject.toml b/pyproject.toml
index 861058dd..91b9f25d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ sqlalchemy = "~=2.0"
 sshtunnel = "0.4.0"
 
 [tool.poetry.dependencies.singer-sdk]
-version = "~=0.39.0"
+git = "https://github.com/meltano/sdk.git"
 
 [tool.poetry.group.dev.dependencies]
 pytest = ">=7.4.2"
diff --git a/target_postgres/connector.py b/target_postgres/connector.py
index 358019f7..5788626e 100644
--- a/target_postgres/connector.py
+++ b/target_postgres/connector.py
@@ -33,6 +33,9 @@
 )
 from sshtunnel import SSHTunnelForwarder
 
+if t.TYPE_CHECKING:
+    from singer_sdk.connectors.sql import FullyQualifiedName
+
 
 class PostgresConnector(SQLConnector):
     """Sets up SQL Alchemy, and other Postgres related stuff."""
@@ -94,7 +97,7 @@ def interpret_content_encoding(self) -> bool:
 
     def prepare_table(  # type: ignore[override]
         self,
-        full_table_name: str,
+        full_table_name: str | FullyQualifiedName,
         schema: dict,
         primary_keys: t.Sequence[str],
         connection: sa.engine.Connection,
@@ -156,7 +159,7 @@ def prepare_table(  # type: ignore[override]
 
     def copy_table_structure(
         self,
-        full_table_name: str,
+        full_table_name: str | FullyQualifiedName,
         from_table: sa.Table,
         connection: sa.engine.Connection,
         as_temp_table: bool = False,
@@ -426,7 +429,7 @@ def create_empty_table(  # type: ignore[override]
 
     def prepare_column(
         self,
-        full_table_name: str,
+        full_table_name: str | FullyQualifiedName,
         column_name: str,
         sql_type: sa.types.TypeEngine,
         connection: sa.engine.Connection | None = None,
@@ -846,7 +849,7 @@ def get_table_columns(  # type: ignore[override]
 
     def column_exists(  # type: ignore[override]
         self,
-        full_table_name: str,
+        full_table_name: str | FullyQualifiedName,
         column_name: str,
         connection: sa.engine.Connection,
     ) -> bool:
diff --git a/target_postgres/sinks.py b/target_postgres/sinks.py
index 2c9e0a6f..4a5c0f1a 100644
--- a/target_postgres/sinks.py
+++ b/target_postgres/sinks.py
@@ -1,8 +1,20 @@
 """Postgres target sink class, which handles writing streams."""
 
+from __future__ import annotations
+
 import datetime
 import uuid
-from typing import Any, Dict, Iterable, List, Optional, Sequence, Union, cast
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Dict,
+    Iterable,
+    List,
+    Optional,
+    Sequence,
+    Union,
+    cast,
+)
 
 import sqlalchemy as sa
 from singer_sdk.sinks import SQLSink
@@ -11,6 +23,9 @@
 
 from target_postgres.connector import PostgresConnector
 
+if TYPE_CHECKING:
+    from singer_sdk.connectors.sql import FullyQualifiedName
+
 
 class PostgresSink(SQLSink):
     """Postgres target sink class."""
@@ -261,7 +276,7 @@ def column_representation(
 
     def generate_insert_statement(
         self,
-        full_table_name: str,
+        full_table_name: str | FullyQualifiedName,
         columns: List[sa.Column],  # type: ignore[override]
     ) -> Union[str, Executable]:
         """Generate an insert statement for the given records.
diff --git a/target_postgres/tests/test_target_postgres.py b/target_postgres/tests/test_target_postgres.py
index a6a622e0..42224bf2 100644
--- a/target_postgres/tests/test_target_postgres.py
+++ b/target_postgres/tests/test_target_postgres.py
@@ -2,17 +2,15 @@
 
 # flake8: noqa
 import copy
-import datetime
 import io
 from contextlib import redirect_stdout
 from decimal import Decimal
 from pathlib import Path
 
-import jsonschema
 import pytest
 import sqlalchemy
 from singer_sdk.exceptions import InvalidRecord, MissingKeyPropertiesError
-from singer_sdk.testing import get_target_test_class, sync_end_to_end
+from singer_sdk.testing import sync_end_to_end
 from sqlalchemy.dialects.postgresql import ARRAY
 from sqlalchemy.types import TEXT, TIMESTAMP