diff --git a/pyproject.toml b/pyproject.toml
index 5eebe161..cb4df480 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -151,7 +151,7 @@ build = [
     # we want all developer environments to be consistent.
     # These dependencies are not used in production environments
     # and should not conflict with other libraries/tooling.
-    "pyinstaller==6.20.0",
+    "pyinstaller==6.21.0",
     "setuptools==82.0.1",
     "build==1.5.0"
 ]