diff --git a/pyproject.toml b/pyproject.toml
index a98758614..41ba84991 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,7 +86,7 @@ dev-pytest = [
   "pytest-mock == 3.15.1",
   "pytest-asyncio == 1.3.0",
   "time-machine == 2.16.0",
-  "async-solipsism == 0.8",
+  "async-solipsism == 0.9",
   "hypothesis == 6.148.6",
 ]
 dev = [