diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 913f06c..eb7c636 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -8,7 +8,7 @@ repos:
     language: python
     files: \.py$
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: "v0.15.18"
+  rev: "v0.15.20"
   hooks:
   - id: ruff-format
 - repo: https://github.com/pre-commit/mirrors-prettier
diff --git a/src/qmxgraph/page/api.js b/src/qmxgraph/page/api.js
index 4593127..4673e7d 100644
--- a/src/qmxgraph/page/api.js
+++ b/src/qmxgraph/page/api.js
@@ -929,7 +929,7 @@ graphs.Api.prototype.setSelectedCells = function setSelectedCells(cellIds) {
     var cellsToSelect = [];
     var model = this._graphEditor.graph.getModel();
     var cell = null;
-    for (var i = cellIds.length; i--; ) {
+    for (var i = cellIds.length; i--;) {
         cell = model.getCell(cellIds[i]);
         cellsToSelect.push(cell);
     }
@@ -947,7 +947,7 @@ graphs.Api.prototype.getSelectedCells = function getSelectedCells() {
     var selectionModel = this._graphEditor.graph.getSelectionModel();
     var cells = selectionModel.cells;
     var cellIds = [];
-    for (var i = cells.length; i--; ) {
+    for (var i = cells.length; i--;) {
         cellIds.push(cells[i].getId());
     }
     return cellIds;
@@ -1144,7 +1144,7 @@ graphs.Api.prototype.removePort = function removePort(vertexId, portName) {
     // This array will contain the port and edges connected on the parent vertex using the port.
     var cellsToRemove = [port];
     var edges = graph.getEdges(parent);
-    for (var i = edges.length; i--; ) {
+    for (var i = edges.length; i--;) {
         var terminals = this._getMxEdgeTerminalsWithPorts(edges[i]);
         var source_terminal = terminals[0];
         var target_terminal = terminals[1];
@@ -1297,7 +1297,7 @@ graphs.Api.prototype.registerSelectionChangedHandler = function registerSelectio
     var selectionHandler = function (source, event) {
         var selectedCells = source.cells;
         var selectedCellsIds = [];
-        for (var i = selectedCells.length; i--; ) {
+        for (var i = selectedCells.length; i--;) {
             selectedCellsIds.push(selectedCells[i].getId());
         }
         handler(selectedCellsIds);
diff --git a/src/qmxgraph/page/graphs.js b/src/qmxgraph/page/graphs.js
index 06cd060..41283aa 100644
--- a/src/qmxgraph/page/graphs.js
+++ b/src/qmxgraph/page/graphs.js
@@ -448,7 +448,7 @@ graphs.createGraph = function createGraph(container, options, styles) {
 
         sender.__moved = [];
 
-        for (var c = cells.length; c--; ) {
+        for (var c = cells.length; c--;) {
             var cell = cells[c];
             if (!cell.isEdge()) {
                 var edges = sender.model.getEdges(cell);