diff --git a/Dependencies.txt b/Dependencies.txt
index 4a6a1d5861..eedaf2128e 100644
--- a/Dependencies.txt
+++ b/Dependencies.txt
@@ -1,6 +1,6 @@
 ZLIB=1.3.1
 abseil-cpp=20250127.0
-Protobuf=v29.3
+Protobuf=v30.1
 Eigen=3.4.0
 Re2=2024-04-01
 CoinUtils=2.11.12
diff --git a/MODULE.bazel b/MODULE.bazel
index 7abb430c3d..9122c974aa 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -25,7 +25,7 @@ bazel_dep(name = "google_benchmark", version = "1.9.1", repo_name = "com_google_
 bazel_dep(name = "googletest", version = "1.16.0", repo_name = "com_google_googletest")
 bazel_dep(name = "highs", version = "1.10.0")
 bazel_dep(name = "platforms", version = "0.0.11")
-bazel_dep(name = "protobuf", version = "29.3", repo_name = "com_google_protobuf")
+bazel_dep(name = "protobuf", version = "30.1", repo_name = "com_google_protobuf")
 bazel_dep(name = "pybind11_abseil", version = "202402.0")
 bazel_dep(name = "pybind11_bazel", version = "2.13.6")
 bazel_dep(name = "pybind11_protobuf", version = "0.0.0-20240524-1d7a729")
diff --git a/bazel/notebook_requirements.in b/bazel/notebook_requirements.in
index ac7ded0926..8d23d12189 100644
--- a/bazel/notebook_requirements.in
+++ b/bazel/notebook_requirements.in
@@ -2,7 +2,7 @@
 absl-py==2.1.0
 immutabledict==3.0.0
 numpy==2.2.0
-protobuf==5.29.3
+protobuf==6.30.1
 requests==2.32.0
 scipy==1.14.1
 
diff --git a/bazel/notebook_requirements.txt b/bazel/notebook_requirements.txt
index 19cfc17e6e..64e7817ae8 100644
--- a/bazel/notebook_requirements.txt
+++ b/bazel/notebook_requirements.txt
@@ -216,7 +216,7 @@ prometheus-client==0.17.1
     # via jupyter-server
 prompt-toolkit==3.0.39
     # via ipython
-protobuf==5.29.3
+protobuf==6.30.1
     # via
     #   -r bazel/notebook_requirements.in
     #   mypy-protobuf
diff --git a/bazel/ortools_requirements.in b/bazel/ortools_requirements.in
index b678926eac..58dd6506ee 100644
--- a/bazel/ortools_requirements.in
+++ b/bazel/ortools_requirements.in
@@ -2,7 +2,7 @@
 absl-py==2.1.0
 immutabledict==3.0.0
 numpy==2.2.0
-protobuf==5.29.3
+protobuf==6.30.1
 requests==2.32.3
 scipy==1.14.1
 
diff --git a/bazel/ortools_requirements.txt b/bazel/ortools_requirements.txt
index 9d8023830e..5597056c44 100644
--- a/bazel/ortools_requirements.txt
+++ b/bazel/ortools_requirements.txt
@@ -45,7 +45,7 @@ platformdirs==3.10.0
     # via
     #   black
     #   virtualenv
-protobuf==5.29.3
+protobuf==6.30.1
     # via
     #   -r bazel/ortools_requirements.in
     #   mypy-protobuf
diff --git a/cmake/dependencies/CMakeLists.txt b/cmake/dependencies/CMakeLists.txt
index e5f6508948..4b12f243a4 100644
--- a/cmake/dependencies/CMakeLists.txt
+++ b/cmake/dependencies/CMakeLists.txt
@@ -113,10 +113,10 @@ if(BUILD_Protobuf)
   FetchContent_Declare(
     Protobuf
     GIT_REPOSITORY "https://github.com/protocolbuffers/protobuf.git"
-    GIT_TAG "v29.3"
+    GIT_TAG "v30.1"
     GIT_SHALLOW TRUE
     GIT_SUBMODULES ""
-    PATCH_COMMAND git apply --ignore-whitespace "${CMAKE_CURRENT_LIST_DIR}/../../patches/protobuf-v29.3.patch"
+    PATCH_COMMAND git apply --ignore-whitespace "${CMAKE_CURRENT_LIST_DIR}/../../patches/protobuf-v30.1.patch"
   )
   FetchContent_MakeAvailable(Protobuf)
   list(POP_BACK CMAKE_MESSAGE_INDENT)
diff --git a/cmake/host.CMakeLists.txt b/cmake/host.CMakeLists.txt
index d7e553976a..7c9b002b20 100644
--- a/cmake/host.CMakeLists.txt
+++ b/cmake/host.CMakeLists.txt
@@ -124,10 +124,10 @@ set(protobuf_WITH_ZLIB OFF)
 FetchContent_Declare(
   protobuf
   GIT_REPOSITORY "https://github.com/protocolbuffers/protobuf.git"
-  GIT_TAG "v29.3"
+  GIT_TAG "v30.1"
   GIT_SHALLOW TRUE
   GIT_SUBMODULES ""
-  PATCH_COMMAND git apply --ignore-whitespace "${CMAKE_CURRENT_LIST_DIR}/@PATCHES_PATH@/protobuf-v29.3.patch"
+  PATCH_COMMAND git apply --ignore-whitespace "${CMAKE_CURRENT_LIST_DIR}/@PATCHES_PATH@/protobuf-v30.1.patch"
 )
 FetchContent_MakeAvailable(protobuf)
 list(POP_BACK CMAKE_MESSAGE_INDENT)
diff --git a/ortools/dotnet/Google.OrTools-full.csproj.in b/ortools/dotnet/Google.OrTools-full.csproj.in
index f6b4a64e2e..7c3e6223a5 100644
--- a/ortools/dotnet/Google.OrTools-full.csproj.in
+++ b/ortools/dotnet/Google.OrTools-full.csproj.in
@@ -193,7 +193,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.29.3"/>
+    <PackageReference Include="Google.Protobuf" Version="3.30.1"/>
   </ItemGroup>
 
   <!-- Need to add required runtime dependencies so Meta-Project will pull runtime Nuget(s) -->
diff --git a/ortools/dotnet/Google.OrTools-local.csproj.in b/ortools/dotnet/Google.OrTools-local.csproj.in
index 42cbc69827..ee865fc9e4 100644
--- a/ortools/dotnet/Google.OrTools-local.csproj.in
+++ b/ortools/dotnet/Google.OrTools-local.csproj.in
@@ -181,7 +181,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.29.3"/>
+    <PackageReference Include="Google.Protobuf" Version="3.30.1"/>
   </ItemGroup>
 
   <!-- Need to add required runtime dependencies so Meta-Project will pull runtime Nuget(s) -->
diff --git a/ortools/java/pom-full.xml.in b/ortools/java/pom-full.xml.in
index 7bfddfefad..b8a66c3d08 100644
--- a/ortools/java/pom-full.xml.in
+++ b/ortools/java/pom-full.xml.in
@@ -109,7 +109,7 @@
   <dependency>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-java</artifactId>
-    <version>4.29.3</version>
+    <version>4.30.1</version>
   </dependency>
 </dependencies>
 
diff --git a/ortools/java/pom-local.xml.in b/ortools/java/pom-local.xml.in
index 10f4bb4f8e..b0e00b5034 100644
--- a/ortools/java/pom-local.xml.in
+++ b/ortools/java/pom-local.xml.in
@@ -81,7 +81,7 @@
   <dependency>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-java</artifactId>
-    <version>4.29.3</version>
+    <version>4.30.1</version>
   </dependency>
 </dependencies>
 
diff --git a/ortools/python/setup.py.in b/ortools/python/setup.py.in
index 261be3a075..11808f68eb 100644
--- a/ortools/python/setup.py.in
+++ b/ortools/python/setup.py.in
@@ -46,7 +46,7 @@ setup(
         'absl-py >= 2.0.0',
         'numpy >= 1.13.3',
         'pandas >= 2.0.0',
-        'protobuf >= 5.29.3,<5.30',
+        'protobuf >= 6.30.1,<6.31',
         'immutabledict >= 3.0.0',
     ],
     package_data={
diff --git a/patches/BUILD.bazel b/patches/BUILD.bazel
index 64bb85c149..a8203d56fd 100644
--- a/patches/BUILD.bazel
+++ b/patches/BUILD.bazel
@@ -14,7 +14,7 @@
 exports_files([
     "abseil-cpp-20250127.0.patch",
     "highs-v1.9.0.patch",
-    "protobuf-v29.3.patch",
+    "protobuf-v30.1.patch",
     "pybind11_abseil.patch",
     "pybind11_protobuf.patch",
     "pybind11.patch",
diff --git a/patches/protobuf-v29.3.patch b/patches/protobuf-v30.1.patch
similarity index 100%
rename from patches/protobuf-v29.3.patch
rename to patches/protobuf-v30.1.patch