diff --git a/package-lock.json b/package-lock.json
index 45756dd3..df70a1db 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -460,7 +460,7 @@
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
       "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
-      "optional": true,
+      "dev": true,
       "requires": {
         "file-uri-to-path": "1.0.0"
       }
@@ -966,7 +966,7 @@
       "version": "0.1.16",
       "resolved": "https://registry.npmjs.org/deasync/-/deasync-0.1.16.tgz",
       "integrity": "sha512-FNCjDwxGbhK+Ye8fmE3p2ahIjERhkbuwX+WVGZPtSbAh9LfE1Saa2p0l+f0t11sIlk9D8W+Bym+cDp6r5yghAQ==",
-      "optional": true,
+      "dev": true,
       "requires": {
         "bindings": "^1.5.0",
         "node-addon-api": "^1.7.1"
@@ -1295,7 +1295,7 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
       "integrity": "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw==",
-      "optional": true
+      "dev": true
     },
     "fill-range": {
       "version": "7.0.1",
@@ -2519,7 +2519,7 @@
       "version": "1.7.1",
       "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-1.7.1.tgz",
       "integrity": "sha512-2+DuKodWvwRTrCfKOeR24KIc5unKjOh8mz17NCzVnHWfjAdDqbfbjqh7gUT+BkXBRQM52+xCHciKWonJ3CbJMQ==",
-      "optional": true
+      "dev": true
     },
     "node-environment-flags": {
       "version": "1.0.5",
diff --git a/package.json b/package.json
index 02d0333c..8b58635c 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "ono": "^5.0.1",
     "path-to-regexp": "^6.0.0"
   },
-  "optionalDependencies": {
+  "peerDependencies": {
     "deasync": "^0.1.16"
   },
   "devDependencies": {
@@ -52,6 +52,7 @@
     "codacy-coverage": "^3.4.0",
     "cookie-parser": "^1.4.4",
     "coveralls": "^3.0.5",
+    "deasync": "^0.1.16",
     "express": "^4.17.1",
     "mocha": "^6.2.0",
     "morgan": "^1.9.1",