diff --git a/backend/python/transformers/requirements-cpu.txt b/backend/python/transformers/requirements-cpu.txt
index 79863c2bfc00..065c5c2d9e52 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 fa9f8953c976..176eb26c9db8 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 127bfb21fddf..373e18a140a0 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 c0ca93ee182f..ba0d4ea19b10 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 1418a3c34261..6e6116c359b1 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 ce8bfd6c0362..062c4139c6a8 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