diff --git a/google/cloud/spanner_dbapi/connection.py b/google/cloud/spanner_dbapi/connection.py
index 3dec2bd028..2e60faecc0 100644
--- a/google/cloud/spanner_dbapi/connection.py
+++ b/google/cloud/spanner_dbapi/connection.py
@@ -31,7 +31,6 @@
 from google.cloud.spanner_dbapi.cursor import Cursor
 from google.cloud.spanner_v1 import RequestOptions
 from google.cloud.spanner_v1.snapshot import Snapshot
-from deprecated import deprecated
 
 from google.cloud.spanner_dbapi.exceptions import (
     InterfaceError,
@@ -187,10 +186,11 @@ def autocommit_dml_mode(self):
         return self._autocommit_dml_mode
 
     @property
-    @deprecated(
-        reason="This method is deprecated. Use _spanner_transaction_started field"
-    )
     def inside_transaction(self):
+        warnings.warn(
+            "This method is deprecated. Use _spanner_transaction_started field",
+            DeprecationWarning,
+        )
         return (
             self._transaction
             and not self._transaction.committed
diff --git a/google/cloud/spanner_dbapi/parse_utils.py b/google/cloud/spanner_dbapi/parse_utils.py
index 3f8f61af08..5446458819 100644
--- a/google/cloud/spanner_dbapi/parse_utils.py
+++ b/google/cloud/spanner_dbapi/parse_utils.py
@@ -17,12 +17,12 @@
 import datetime
 import decimal
 import re
+import warnings
 
 import sqlparse
 from google.cloud import spanner_v1 as spanner
 from google.cloud.spanner_v1 import JsonObject
 from . import client_side_statement_parser
-from deprecated import deprecated
 
 from .exceptions import Error
 from .parsed_statement import ParsedStatement, StatementType, Statement
@@ -179,7 +179,6 @@
 RE_PYFORMAT = re.compile(r"(%s|%\([^\(\)]+\)s)+", re.DOTALL)
 
 
-@deprecated(reason="This method is deprecated. Use _classify_stmt method")
 def classify_stmt(query):
     """Determine SQL query type.
     :type query: str
@@ -187,6 +186,10 @@ def classify_stmt(query):
     :rtype: str
     :returns: The query type name.
     """
+    warnings.warn(
+        "This method is deprecated. Use _classify_stmt method", DeprecationWarning
+    )
+
     # sqlparse will strip Cloud Spanner comments,
     # still, special commenting styles, like
     # PostgreSQL dollar quoted comments are not
diff --git a/setup.py b/setup.py
index 4518234679..ca44093157 100644
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,6 @@
     "sqlparse >= 0.4.4",
     "proto-plus >= 1.22.2, <2.0.0dev; python_version>='3.11'",
     "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
-    "deprecated >= 1.2.14",
     "grpc-interceptor >= 0.15.4",
 ]
 extras = {