diff --git a/axisregistry/requirements.txt b/axisregistry/requirements.txt
index ac59e10749b..deffd1ed393 100644
--- a/axisregistry/requirements.txt
+++ b/axisregistry/requirements.txt
@@ -1,4 +1,4 @@
 --index-url https://pypi.python.org/simple/
-protobuf==3.20.3
+protobuf==6.33.5
 importlib_resources ; python_version < '3.10'
 -e .
diff --git a/axisregistry/setup.py b/axisregistry/setup.py
index 5d667083b6a..ecf2cbbb2a8 100644
--- a/axisregistry/setup.py
+++ b/axisregistry/setup.py
@@ -47,7 +47,7 @@
         "setuptools_scm[toml]>=6.2",
     ],
     install_requires=[
-        "protobuf>=3.19.4, <4",
+        "protobuf>=3.19.4, <7",
         "fonttools",
         "importlib_resources ; python_version < '3.10'",
     ],
diff --git a/lang/pyproject.toml b/lang/pyproject.toml
index 82a1fb477b8..8cd0edabdb8 100644
--- a/lang/pyproject.toml
+++ b/lang/pyproject.toml
@@ -24,7 +24,7 @@ authors = [
 ]
 
 dependencies = [
-   "protobuf>=3.7.0, <4",
+   "protobuf>=3.7.0, <7",
    "importlib_resources ; python_version < '3.10'",
 ]