diff --git a/pyproject.toml b/pyproject.toml
index 26fe4772a..a57cd2a48 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ Source = "https://github.com/aws-deadline/deadline-cloud"
 [project.optional-dependencies]
 gui = [
   # If the version changes, update the version in deadline/client/ui/__init__.py
-  "PySide6-essentials >= 6.6,< 6.11",
+  "PySide6-essentials >= 6.6,< 6.12",
 ]
 mcp = [
   "mcp >= 1.13.0, < 2",
diff --git a/requirements-testing.txt b/requirements-testing.txt
index ad26686b6..a891a56dd 100644
--- a/requirements-testing.txt
+++ b/requirements-testing.txt
@@ -21,4 +21,4 @@ openjd-model >= 0.11.3
 
 # GUI testing dependencies
 pytest-qt == 4.*
-PySide6-essentials >= 6.6,< 6.11
+PySide6-essentials >= 6.6,< 6.12