diff --git a/pyproject.toml b/pyproject.toml
index bb479c47..b956e9a1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,9 +24,9 @@ classifiers = [
 ]
 dependencies = [
     # install `psycopg2` on linux (assumed production)
-    'psycopg2>=2.9,<3.0; platform_system == "linux"',
+    'psycopg2>=2.9,<3.0; platform_system == "Linux"',
     # install `psycopg2-binary` on macos/windows (assumed development)
-    'psycopg2-binary>=2.9,<3.0; platform_system != "linux"',
+    'psycopg2-binary>=2.9,<3.0; platform_system != "Linux"',
     "dbt-adapters>=0.1.0a1,<2.0",
     # add dbt-core to ensure backwards compatibility of installation, this is not a functional dependency
     "dbt-core>=1.8.0a1",