diff --git a/pyproject.toml b/pyproject.toml
index 20617ad..963fef7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ requires = [
   # sure the code is generated using the minimum supported versions, as older
   # versions can't work with code that was generated with newer versions.
   # https://protobuf.dev/support/cross-version-runtime-guarantee/#backwards
-  "protobuf == 6.33.5",
+  "protobuf == 7.35.0",
   "grpcio-tools == 1.72.1",
   "grpcio == 1.72.1",
 
@@ -48,7 +48,7 @@ dependencies = [
   # We can't widen beyond the current value unless we bump the minimum
   # requirements too because of protobuf cross-version runtime guarantees:
   # https://protobuf.dev/support/cross-version-runtime-guarantee/#major
-  "protobuf >= 6.32.1, < 8", # Do not widen beyond 8!
+  "protobuf >= 7.35.0, < 9", # Do not widen beyond 9!
   # We couldn't find any document with a spec about the cross-version runtime
   # guarantee for grpcio, so unless we find one in the future, we'll assume
   # major version jumps are not compatible