diff --git a/pyproject.toml b/pyproject.toml
index 87c1cae..d87d3a0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ license = {file = "LICENSE"}
 dynamic = ["version"]
 dependencies = [
     "asn1>=2.7.0,<3.0.0",
-    "pikepdf>=8.0.0,<9.0.0",
+    "pikepdf>=8.0.0,<10.0.0",
 ]
 
 [build-system]