diff --git a/pyproject.toml b/pyproject.toml
index 575fa7b..3d7e8f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ classifiers = [
 dependencies = [
     "lz4",
     "pefile",
-    "testgres>=1.14.4",
+    "testgres>=1.14.4,<1.18",
     "zstd",
 ]