diff --git a/pyproject.toml b/pyproject.toml
index 7d0dd867..a233e4f1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ dev = [
     "mypy == 1.18.2",
     "ufmt == 2.8.0",
     "usort == 1.0.8.post1",
-    "pyrefly == 0.36.2",
+    "pyrefly == 0.39.4",
 ]
 lsp = [
     "pygls[ws] ~= 1.3.1",