diff --git a/packages/primevue/src/tree/Tree.vue b/packages/primevue/src/tree/Tree.vue
index db04745410..6cb8b19c2e 100755
--- a/packages/primevue/src/tree/Tree.vue
+++ b/packages/primevue/src/tree/Tree.vue
@@ -221,6 +221,54 @@ export default {
             return matched;
         }
     },
+    watch: {
+        valueToRender(newValueToRender) {
+            const _selectionKeys = { ...this.selectionKeys };
+
+            const getChildrenSelection = (node) => {
+                const selection = { allChecked: true, someChecked: false };
+
+                for (const childNode of node.children) {
+                    const keyState = _selectionKeys[childNode.key];
+
+                    if (keyState?.checked) {
+                        selection.someChecked = true;
+                    } else if (keyState?.partialChecked) {
+                        selection.someChecked = true;
+                        selection.allChecked = false;
+                    } else {
+                        selection.allChecked = false;
+                    }
+                }
+
+                return selection;
+            };
+
+            const recalculateSelection = (nodes) => {
+                for (const node of nodes) {
+                    if (!node.children || !node.children.length) {
+                        continue;
+                    }
+
+                    recalculateSelection(node.children);
+
+                    const { allChecked, someChecked } = getChildrenSelection(node);
+
+                    if (allChecked) {
+                        _selectionKeys[node.key] = { checked: true, partialChecked: false };
+                    } else if (someChecked) {
+                        _selectionKeys[node.key] = { checked: false, partialChecked: true };
+                    } else {
+                        delete _selectionKeys[node.key];
+                    }
+                }
+            };
+
+            recalculateSelection(newValueToRender);
+
+            this.$emit('update:selectionKeys', _selectionKeys);
+        }
+    },
     computed: {
         filteredValue() {
             let filteredNodes = [];