diff --git a/pyproject.toml b/pyproject.toml
index 578ba2ec..7b63304f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -106,7 +106,7 @@ dev = [
     "memray==1.19.2",
     "mypy>=1.13.0",
     "mypy-extensions==1.0.0",
-    "mypy-protobuf==3.6.0",
+    "mypy-protobuf==5.1.0",
     "pre-commit>=4.3.0",
     "pytest-flask==1.3.0",
     "pytest-order==1.3.0",
diff --git a/uv.lock b/uv.lock
index c2855b8c..af412b8a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -130,7 +130,7 @@ dev = [
     { name = "memray", specifier = "==1.19.2" },
     { name = "mypy", specifier = ">=1.13.0" },
     { name = "mypy-extensions", specifier = "==1.0.0" },
-    { name = "mypy-protobuf", specifier = "==3.6.0" },
+    { name = "mypy-protobuf", specifier = "==5.1.0" },
     { name = "pre-commit", specifier = ">=4.3.0" },
     { name = "pytest-flask", specifier = "==1.3.0" },
     { name = "pytest-order", specifier = "==1.3.0" },
@@ -1619,15 +1619,15 @@ wheels = [
 
 [[package]]
 name = "mypy-protobuf"
-version = "3.6.0"
+version = "5.1.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "protobuf" },
     { name = "types-protobuf" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/4d/6f/282d64d66bf48ce60e38a6560753f784e0f88ab245ac2fb5e93f701a36cd/mypy-protobuf-3.6.0.tar.gz", hash = "sha256:02f242eb3409f66889f2b1a3aa58356ec4d909cdd0f93115622e9e70366eca3c", size = 24445, upload-time = "2024-04-01T20:24:42.837Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/87/07/7ffb897eee5c01e816e037f51a6720bf1a0a8c17cca1a2382ae554f43044/mypy_protobuf-5.1.0.tar.gz", hash = "sha256:8493758852a9cdc075a11dbe96c6e37ea2feba5fd5f33ef7442b9a275322a94c", size = 37529, upload-time = "2026-04-28T15:56:40.356Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/e8/73/d6b999782ae22f16971cc05378b3b33f6a89ede3b9619e8366aa23484bca/mypy_protobuf-3.6.0-py3-none-any.whl", hash = "sha256:56176e4d569070e7350ea620262478b49b7efceba4103d468448f1d21492fd6c", size = 16434, upload-time = "2024-04-01T20:24:40.583Z" },
+    { url = "https://files.pythonhosted.org/packages/e8/ec/5ffcf8f5f53757e01afdece10c664e694ac60d2f17c2036811b85b842a5b/mypy_protobuf-5.1.0-py3-none-any.whl", hash = "sha256:d7031f563f806b8bcd448a3e86768bf0994c0af5b0017b344a4fbbba4191f43c", size = 26313, upload-time = "2026-04-28T15:56:39.096Z" },
 ]
 
 [[package]]