fix: raise grpcio lower bound to >=1.80.0 for Python 3.9+

CHANGELOG.md

@@ -7,6 +7,14 @@ The major version of this package tracks the TTS Service API major version.
 
 ## [Unreleased]
 
+## [3.2.2] - 2026-04-01
+
+### Fixed
+- Raised `grpcio` lower bound to `>=1.80.0` for Python 3.9+ (grpcio skips 1.79.x;
+  grpcio 1.78.x causes runtime failures when combined with livekit-agents>=1.5.1).
+  No stub regeneration required — generated stubs (GRPC_GENERATED_VERSION='1.70.0')
+  are forward-compatible with grpcio 1.80.0.
+
 ## [3.2.1+1] - 2026-03-30
 
 ### Added

pyproject.toml

@@ -1,6 +1,8 @@
 [build-system]
-# grpcio-tools 1.71.0+ ships protobuf 6.x which generates stubs requiring Python>=3.9.
-# Keep <1.71.0 so generated stubs stay compatible with Python 3.8 (protobuf 5.29.x).
+# grpcio-tools is the BUILD-TIME stub generator only — its version is independent of
+# the runtime grpcio lower bound (>=1.80.0 for 3.9+) set in [project.dependencies].
+# Keep <1.71.0: grpcio-tools 1.71.0+ ships protobuf 6.x which generates stubs
+# requiring Python>=3.9, breaking our Python 3.8 support.
 requires = ["setuptools>=61", "grpcio-tools>=1.70.0,<1.71.0"]
 build-backend = "setuptools.build_meta"
 
@@ -14,7 +16,11 @@ requires-python = ">=3.8"
 dependencies = [
     # Generated stubs embed GRPC_GENERATED_VERSION='1.70.0'; grpcio 1.71.0 dropped Python 3.8.
     "grpcio>=1.70.0,<1.71.0; python_version=='3.8'",
-    "grpcio>=1.70.0; python_version>='3.9'",
+    # grpcio skips 1.79.x (jumps 1.78.0→1.80.0); environments combining tts-api with
+    # livekit-agents>=1.5.1 fail at runtime with 1.78.x due to livekit's transitive stubs
+    # requiring grpcio>=1.80.0.  The generated stubs (GRPC_GENERATED_VERSION='1.70.0') are
+    # forward-compatible with 1.80.0, so no stub regeneration is needed.
+    "grpcio>=1.80.0; python_version>='3.9'",
     # Stubs generated with protobuf 5.29.x; protobuf 6.x requires Python>=3.9.
     "protobuf>=5.29.0,<6.0.0; python_version=='3.8'",
     "protobuf>=5.29.0; python_version>='3.9'",

tts_service_api/VERSION.py

@@ -1 +1 @@
-__version__ = "3.2.1+1"
+__version__ = "3.2.2"