diff --git a/python/requirements.txt b/python/requirements.txt
index 094d2f98213a747783461e5c6050e525d3bfdb7f..5565dda12573684ecb22dd19cb9498cf80206b04 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -4,7 +4,7 @@ wheel>=0.34.0, <0.35.0
 setuptools>=44.1.0
 google>=2.0.3
 protobuf>=3.12.2
-grpcio-tools>=1.28.1
+grpcio-tools==1.33.2
 grpcio>=1.28.1
 func-timeout>=4.3.5
 pyyaml>=5.1
@@ -20,5 +20,6 @@ sentencepiece==0.1.96; platform_machine !=  "aarch64"
 sentencepiece; platform_machine ==  "aarch64"
 opencv-python==4.3.0.38; platform_machine !=  "aarch64"
 opencv-python; platform_machine == "aarch64"
-pytest 
-prometheus-client==0.12.0
\ No newline at end of file
+pytest==7.0.1
+prometheus-client==0.12.0
+pillow==8.4.0
diff --git a/python/requirements_mac.txt b/python/requirements_mac.txt
index 6a396239c5e68e545bd5af0928b3e6f42b19c82b..df197930750049258d4b02742bd78e74ba8377d2 100644
--- a/python/requirements_mac.txt
+++ b/python/requirements_mac.txt
@@ -14,6 +14,7 @@ Jinja2==2.11.3
 MarkupSafe==1.1.1
 Werkzeug==1.0.1
 ujson>=2.0.3
-grpcio-tools>=1.33.2
+grpcio-tools==1.33.2
 grpcio>=1.33.2
 sentencepiece==0.1.83
+pillow==8.4.0