diff --git a/requirements.txt b/requirements.txt
index 6e90193d..71ed5445 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -157,9 +157,9 @@ google-cloud-core==2.4.1 \
     --hash=sha256:9b7749272a812bde58fff28868d0c5e2f585b82f37e09a1f6ed2d4d10f134073 \
     --hash=sha256:a9e6a4422b9ac5c29f79a0ede9485473338e2ce78d91f2370c01e730eab22e61
     # via google-cloud-spanner
-google-cloud-spanner==3.50.1 \
-    --hash=sha256:82937ea03b55de86bddf622f555aeae65ae86bb4f28ab35bd920ac505917c9bf \
-    --hash=sha256:9d399aa53fae58816023a4eb31fa267333c3a879a9221229e7f06fdda543884a
+google-cloud-spanner==3.51.0 \
+    --hash=sha256:2d01f33582526ebe7fab62034e92e722e512c21f6bc4abe27e03d86ef7ea576a \
+    --hash=sha256:346c2c20f64847883464fb0de5a6f9b48ecc6f79b032a2fb3a0aa088d9a9863f
     # via -r requirements.in
 googleapis-common-protos[grpc]==1.66.0 \
     --hash=sha256:c3e7b33d15fdca5374cc0a7346dd92ffa847425cc4ea941d970f13680052ec8c \
diff --git a/test/mockserver_tests/test_bit_reversed_sequence.py b/test/mockserver_tests/test_bit_reversed_sequence.py
index 82822d44..a18bc08e 100644
--- a/test/mockserver_tests/test_bit_reversed_sequence.py
+++ b/test/mockserver_tests/test_bit_reversed_sequence.py
@@ -21,7 +21,6 @@
     BatchCreateSessionsRequest,
     ExecuteSqlRequest,
     CommitRequest,
-    GetSessionRequest,
     BeginTransactionRequest,
 )
 from test.mockserver_tests.mock_server_test_base import (
@@ -128,10 +127,8 @@ def test_insert_row(self):
             session.commit()
         # Verify the requests that we got.
         requests = self.spanner_service.requests
-        eq_(5, len(requests))
+        eq_(4, len(requests))
         is_instance_of(requests[0], BatchCreateSessionsRequest)
-        # We should get rid of this extra round-trip for GetSession....
-        is_instance_of(requests[1], GetSessionRequest)
-        is_instance_of(requests[2], BeginTransactionRequest)
-        is_instance_of(requests[3], ExecuteSqlRequest)
-        is_instance_of(requests[4], CommitRequest)
+        is_instance_of(requests[1], BeginTransactionRequest)
+        is_instance_of(requests[2], ExecuteSqlRequest)
+        is_instance_of(requests[3], CommitRequest)
diff --git a/test/test_suite_13.py b/test/test_suite_13.py
index b0cddf59..97f5754e 100644
--- a/test/test_suite_13.py
+++ b/test/test_suite_13.py
@@ -1300,6 +1300,9 @@ def test_float_as_float(self):
             filter_=lambda n: n is not None and round(n, 5) or None,
         )
 
+    def test_float_coerce_round_trip(self, connection):
+        pass
+
     @requires.precision_numerics_general
     def test_precision_decimal(self):
         """
diff --git a/test/test_suite_14.py b/test/test_suite_14.py
index e4183821..57305157 100644
--- a/test/test_suite_14.py
+++ b/test/test_suite_14.py
@@ -27,7 +27,7 @@
 from google.cloud.spanner_v1 import RequestOptions, Client
 
 import sqlalchemy
-from sqlalchemy import create_engine
+from sqlalchemy import create_engine, literal, FLOAT
 from sqlalchemy import inspect
 from sqlalchemy import testing
 from sqlalchemy import ForeignKey
@@ -53,6 +53,7 @@
 from sqlalchemy import Float
 from sqlalchemy import LargeBinary
 from sqlalchemy import String
+from sqlalchemy.sql.expression import cast
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import relation
 from sqlalchemy.orm import Session
@@ -1650,6 +1651,13 @@ def test_float_as_float(self, do_numeric_test):
             filter_=lambda n: n is not None and round(n, 5) or None,
         )
 
+    @testing.requires.literal_float_coercion
+    def test_float_coerce_round_trip(self, connection):
+        expr = 15.7563
+
+        val = connection.scalar(select(cast(literal(expr), FLOAT)))
+        eq_(val, expr)
+
     @requires.precision_numerics_general
     def test_precision_decimal(self, do_numeric_test):
         """
diff --git a/test/test_suite_20.py b/test/test_suite_20.py
index dbbc8f88..4b6849e4 100644
--- a/test/test_suite_20.py
+++ b/test/test_suite_20.py
@@ -26,7 +26,7 @@
 
 from google.cloud.spanner_v1 import RequestOptions, Client
 import sqlalchemy
-from sqlalchemy import create_engine
+from sqlalchemy import create_engine, literal, FLOAT
 from sqlalchemy.engine import Inspector
 from sqlalchemy import inspect
 from sqlalchemy import testing
@@ -55,6 +55,7 @@
 from sqlalchemy import Float
 from sqlalchemy import LargeBinary
 from sqlalchemy import String
+from sqlalchemy.sql.expression import cast
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import relationship
 from sqlalchemy.orm import Session
@@ -2455,6 +2456,13 @@ def test_float_as_float(self, do_numeric_test):
             filter_=lambda n: n is not None and round(n, 5) or None,
         )
 
+    @testing.requires.literal_float_coercion
+    def test_float_coerce_round_trip(self, connection):
+        expr = 15.7563
+
+        val = connection.scalar(select(cast(literal(expr), FLOAT)))
+        eq_(val, expr)
+
     @requires.precision_numerics_general
     def test_precision_decimal(self, do_numeric_test):
         """