diff --git a/pyproject.toml b/pyproject.toml
index f9b8b0f7..572706ca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ dependencies = [
     # installed via dbt-common but used directly
     "agate>=1.0,<2.0",
     "mashumaro[msgpack]>=3.0,<4.0",
-    "protobuf>=3.0,<5.0",
+    "protobuf>=3.0,<6.0",
     "typing-extensions>=4.0,<5.0",
 ]
 [project.urls]