diff --git a/pyproject.toml b/pyproject.toml
index 172a873f..48cc5af3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ requires = [
     "wheel>=0.38.0",
     "importlib_resources>=1.3",
     # When this gets updated check "python -m grpc_tools.protoc --version" and update the protobuf dependency below
-    "grpcio-tools==1.67.1",
+    "grpcio-tools==1.70.0",
     "googleapis-common-protos>=1.3.1",
 ]
 build-backend = "setuptools.build_meta"
@@ -41,9 +41,9 @@ classifiers = [
     "Topic :: Text Processing :: Linguistic",
 ]
 dependencies = [
-    "grpcio==1.67.1",
-    "grpcio-health-checking==1.67.1",
-    "grpcio-status==1.67.1",
+    "grpcio==1.70.0",
+    "grpcio-health-checking==1.70.0",
+    "grpcio-status==1.70.0",
     "protobuf>=5.27.2",                # This is determined by the grpcio-tools build tool above.
     "pyyaml>=6.0.0",
     "tqdm>=4.0.0",
@@ -70,7 +70,7 @@ write_to = "python/mtap/version.py"
 test = [
     "pytest==8.3.4",
     "pytest-mock==3.14.0",
-    "grpcio-testing==1.67.1",
+    "grpcio-testing==1.70.0",
     "requests==2.32.3",
 ]
 docs = ["sphinx==8.1.3", "sphinx-rtd-theme==3.0.2"]