diff --git a/pyproject.toml b/pyproject.toml
index d0781d6..1c94ac0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,8 +11,8 @@ requires = [
   # 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",
-  "grpcio-tools == 1.81.0",
-  "grpcio == 1.81.0",
+  "grpcio-tools == 1.81.1",
+  "grpcio == 1.81.1",
 
 ]
 build-backend = "setuptools.build_meta"
@@ -52,7 +52,7 @@ dependencies = [
   # 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
-  "grpcio >= 1.81.0, < 2", # Do not widen beyond 2!
+  "grpcio >= 1.81.1, < 2", # Do not widen beyond 2!
 ]
 dynamic = ["version"]