diff --git a/setup.py b/setup.py
index 2c039fe7..8e773f7f 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@
 description = "SQLAlchemy dialect integrated into Cloud Spanner database"
 dependencies = [
     "sqlalchemy>=1.1.13",
-    "google-cloud-spanner>=3.55.0",
+    "google-cloud-spanner==3.55.0",
     "alembic",
 ]
 extras = {