diff --git a/pyproject.toml b/pyproject.toml
index 2fe9be8f..a0781202 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ classifiers = [
   "Programming Language :: Python :: Implementation :: PyPy",
 ]
 dependencies = [
-  "agate>=1.7.0,<1.8",
+  "agate>=1.8.0,<1.10",
   "colorama>=0.3.9,<0.5",
   "isodate>=0.6,<0.7",
   "jsonschema>=4.0,<5.0",