diff --git a/pyproject.toml b/pyproject.toml
index 33d588b29..d5900be46 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,7 +45,7 @@ dependencies = [
     "mitmproxy_rs>=0.5.1,<0.6",  # relaxed upper bound here: we control this
     "msgpack>=1.0.0,<=1.0.8",
     "passlib>=1.6.5,<=1.7.4",
-    "protobuf>=3.14,<=5.26.1",
+    "protobuf>=3.14,<=5.27.0",
     "pydivert>=2.0.3,<=2.1.0; sys_platform == 'win32'",
     "pyOpenSSL>=22.1,<=24.1.0",
     "pyparsing>=2.4.2,<=3.1.2",