diff --git a/backend/python/transformers/requirements-cpu.txt b/backend/python/transformers/requirements-cpu.txt
index 79863c2b..065c5c2d 100644
--- a/backend/python/transformers/requirements-cpu.txt
+++ b/backend/python/transformers/requirements-cpu.txt
@@ -5,4 +5,5 @@ accelerate
 transformers
 bitsandbytes
 outetts
-sentence-transformers==3.4.1
\ No newline at end of file
+sentence-transformers==3.4.1
+protobuf==6.31.0
\ No newline at end of file
diff --git a/backend/python/transformers/requirements-cublas11.txt b/backend/python/transformers/requirements-cublas11.txt
index fa9f8953..176eb26c 100644
--- a/backend/python/transformers/requirements-cublas11.txt
+++ b/backend/python/transformers/requirements-cublas11.txt
@@ -7,3 +7,4 @@ transformers
 bitsandbytes
 outetts
 sentence-transformers==3.4.1
+protobuf==6.31.0
\ No newline at end of file
diff --git a/backend/python/transformers/requirements-cublas12.txt b/backend/python/transformers/requirements-cublas12.txt
index 127bfb21..373e18a1 100644
--- a/backend/python/transformers/requirements-cublas12.txt
+++ b/backend/python/transformers/requirements-cublas12.txt
@@ -6,3 +6,4 @@ transformers
 bitsandbytes
 outetts
 sentence-transformers==3.4.1
+protobuf==6.31.0
\ No newline at end of file
diff --git a/backend/python/transformers/requirements-hipblas.txt b/backend/python/transformers/requirements-hipblas.txt
index c0ca93ee..ba0d4ea1 100644
--- a/backend/python/transformers/requirements-hipblas.txt
+++ b/backend/python/transformers/requirements-hipblas.txt
@@ -8,3 +8,4 @@ bitsandbytes
 outetts
 bitsandbytes
 sentence-transformers==3.4.1
+protobuf==6.31.0
\ No newline at end of file
diff --git a/backend/python/transformers/requirements-intel.txt b/backend/python/transformers/requirements-intel.txt
index 1418a3c3..6e6116c3 100644
--- a/backend/python/transformers/requirements-intel.txt
+++ b/backend/python/transformers/requirements-intel.txt
@@ -9,3 +9,4 @@ intel-extension-for-transformers
 bitsandbytes
 outetts
 sentence-transformers==3.4.1
+protobuf==6.31.0
\ No newline at end of file
diff --git a/backend/python/transformers/requirements.txt b/backend/python/transformers/requirements.txt
index ce8bfd6c..062c4139 100644
--- a/backend/python/transformers/requirements.txt
+++ b/backend/python/transformers/requirements.txt
@@ -1,5 +1,5 @@
 grpcio==1.72.0
-protobuf
+protobuf==6.31.0
 certifi
 setuptools
 scipy==1.15.1