diff --git a/pyproject.toml b/pyproject.toml
index acefaff..e599072 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
     "openpyxl~=3.1",
     "pandas~=2.0",
     "pingouin~=0.5.3",
-    "protobuf~=4.24",
+    "protobuf~=5.26",
     "pyndeval~=0.0.3",
     "python-terrier~=0.10.0",
     "pyyaml~=6.0",