diff --git a/package.json b/package.json
index 5c791a0..54cb137 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "rollup-plugin-babel": "^4.3.3",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-serve": "^1.0.1",
-    "rollup-plugin-terser": "^7.0.1",
+    "rollup-plugin-terser": "^5.1.2",
     "rollup-plugin-typescript2": "^0.24.3",
     "rollup-plugin-uglify": "^6.0.3",
     "typescript": "^3.6.4"