diff --git a/packages/sandbox/src/sandbox.js b/packages/sandbox/src/sandbox.js
index 2137e6c..daffdee 100644
--- a/packages/sandbox/src/sandbox.js
+++ b/packages/sandbox/src/sandbox.js
@@ -51,12 +51,53 @@ export default class Sandbox {
   }
 
   evaluateAssignmentExpression(node) {
-    const {left, right} = node;
+    const {operator, left, right} = node;
     const scope = this.nodeScope(node);
     const {Vasync, value} = this.evaluate(right);
     if (!types.isMemberExpression(left)) {
       const assign = (value) => {
-        scope.set(left.name, value);
+        switch (operator) {
+          case '=':
+            return scope.set(left.name, value);
+          case '+=':
+            return scope.set(left.name, scope.get(left.name) + value);
+          case '-=':
+            return scope.set(left.name, scope.get(left.name) - value);
+          case '*=':
+            return scope.set(left.name, scope.get(left.name) * value);
+          case '/=':
+            return scope.set(left.name, scope.get(left.name) / value);
+          case '%=':
+            return scope.set(left.name, scope.get(left.name) % value);
+          case '**=':
+            return scope.set(left.name, scope.get(left.name) ** value);
+          /* eslint-disable no-bitwise */
+          case '<<=':
+            return scope.set(left.name, scope.get(left.name) << value);
+          case '>>=':
+            return scope.set(left.name, scope.get(left.name) >> value);
+          case '>>>=':
+            return scope.set(left.name, scope.get(left.name) >>> value);
+          case '|=':
+            return scope.set(left.name, scope.get(left.name) | value);
+          case '^=':
+            return scope.set(left.name, scope.get(left.name) ^ value);
+          case '&=':
+            return scope.set(left.name, scope.get(left.name) & value);
+          /* eslint-enable no-bitwise */
+          case '||=':
+            return scope.set(left.name, scope.get(left.name) || value);
+          case '&&=':
+            return scope.set(left.name, scope.get(left.name) && value);
+          case '??=': {
+            const l = scope.get(left.name);
+            return scope.set(left.name, (l === null || l === undefined) ? value : l);
+          }
+          default:
+            // eslint-disable-next-line no-console
+            console.error("evaluateAssignmentExpression(): Can't handle operator", node.operator);
+            return undefined;
+        }
         return value;
       };
       if (Vasync) {
@@ -77,8 +118,49 @@ export default class Sandbox {
       if (optional && !O) {
         return undefined;
       }
-      // eslint-disable-next-line no-param-reassign, no-return-assign
-      return O[P] = value;
+      switch (operator) {
+        /* eslint-disable no-param-reassign, no-return-assign */
+        case '=':
+          return O[P] = value;
+        case '+=':
+          return O[P] += value;
+        case '-=':
+          return O[P] -= value;
+        case '*=':
+          return O[P] *= value;
+        case '/=':
+          return O[P] /= value;
+        case '%=':
+          return O[P] %= value;
+        case '**=':
+          return O[P] **= value;
+        /* eslint-disable no-bitwise */
+        case '<<=':
+          return O[P] <<= value;
+        case '>>=':
+          return O[P] >>= value;
+        case '>>>=':
+          return O[P] >>>= value;
+        case '|=':
+          return O[P] |= value;
+        case '^=':
+          return O[P] ^= value;
+        case '&=':
+          return O[P] &= value;
+        /* eslint-enable no-bitwise */
+        case '||=':
+          return O[P] ||= value;
+        case '&&=':
+          return O[P] &&= value;
+        case '??=': {
+          return O[P] = (O[P] === null || O[P] === undefined) ? value : O[P];
+        /* eslint-enable no-param-reassign, no-return-assign */
+        }
+        default:
+          // eslint-disable-next-line no-console
+          console.error("evaluateAssignmentExpression(): Can't handle operator", node.operator);
+          return undefined;
+      }
     };
     const makeAsync = (O, P, value) => (
       Promise.all([O, P, value]).then(([O, P, value]) => memberAssign(O, P, value))