diff --git a/poetry.lock b/poetry.lock
index c71b6de..b651d27 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1266,7 +1266,7 @@ evaluation = ["musdb", "museval"]
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.6.2,<3.10"
-content-hash = "9888d4c62cd916e50a29f0cc78ff829e101f6af1bf04f100321a7927e412ff39"
+content-hash = "13758a3396cfd315127e3c3e0332b157327cb2ccf672769ec2e45d790b56145a"
 
 [metadata.files]
 absl-py = [
diff --git a/pyproject.toml b/pyproject.toml
index 05e9bae..dffa38b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,6 +58,7 @@ numpy = "<1.20.0,>=1.16.0"
 importlib-resources = {version = "^4.1.1", python = "<3.7"}
 importlib-metadata = {version = "^3.0.0", python = "<3.8"}
 llvmlite = "^0.36.0"
+protobuf = "<=3.19.4"
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.1"