diff --git a/package-lock.json b/package-lock.json
index cfe65ad..6d9ea7a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,16 +27,24 @@
         "mocha": "^8.2.1",
         "neo-blessed": "^0.2.0",
         "prettier": "^2.2.1",
+        "react-devtools-core": "4.10.1",
         "rollup": "^2.38.5",
         "rollup-plugin-babel": "^4.4.0",
         "rollup-plugin-commonjs": "^10.1.0",
         "rollup-plugin-node-resolve": "^5.2.0"
       },
       "peerDependencies": {
-        "blessed": "^0.1.81",
-        "react": "^17.0.1",
-        "react-devtools-core": "^3.0.0",
-        "ws": "^6.0.0"
+        "blessed": ">=0.1.81 <0.2.0",
+        "react": ">=17.0.1 <18.0.0",
+        "react-devtools-core": ">=4.10.1 <5.0.0"
+      },
+      "peerDependenciesMeta": {
+        "blessed": {
+          "optional": true
+        },
+        "react-devtools-core": {
+          "optional": true
+        }
       }
     },
     "node_modules/@babel/cli": {
@@ -1546,12 +1554,6 @@
       "dev": true,
       "optional": true
     },
-    "node_modules/async-limiter": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
-      "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ==",
-      "peer": true
-    },
     "node_modules/atob": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
@@ -4030,6 +4032,7 @@
       "version": "17.0.1",
       "resolved": "https://registry.npmjs.org/react/-/react-17.0.1.tgz",
       "integrity": "sha512-lG9c9UuMHdcAexXtigOZLX8exLWkW0Ku29qPRU8uhF2R9BN96dLCt0psvzPLlHc5OWkgymP3qwTRgbnw5BKx3w==",
+      "license": "MIT",
       "dependencies": {
         "loose-envify": "^1.1.0",
         "object-assign": "^4.1.1"
@@ -4039,24 +4042,13 @@
       }
     },
     "node_modules/react-devtools-core": {
-      "version": "3.6.3",
-      "resolved": "https://registry.npmjs.org/react-devtools-core/-/react-devtools-core-3.6.3.tgz",
-      "integrity": "sha512-+P+eFy/yo8Z/UH9J0DqHZuUM5+RI2wl249TNvMx3J2jpUomLQa4Zxl56GEotGfw3PIP1eI+hVf1s53FlUONStQ==",
-      "peer": true,
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/react-devtools-core/-/react-devtools-core-4.10.1.tgz",
+      "integrity": "sha512-sXbBjGAWcf9HAblTP/zMtFhGHqxAfIR+GPxONZsSGN9FHnF4635dx1s2LdQWG9rJ+Ehr3nWg+BUAB6P78my5PA==",
+      "dev": true,
       "dependencies": {
         "shell-quote": "^1.6.1",
-        "ws": "^3.3.1"
-      }
-    },
-    "node_modules/react-devtools-core/node_modules/ws": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
-      "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
-      "peer": true,
-      "dependencies": {
-        "async-limiter": "~1.0.0",
-        "safe-buffer": "~5.1.0",
-        "ultron": "~1.1.0"
+        "ws": "^7"
       }
     },
     "node_modules/react-reconciler": {
@@ -4376,7 +4368,8 @@
     "node_modules/safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "dev": true
     },
     "node_modules/safe-regex": {
       "version": "1.1.0",
@@ -4441,7 +4434,7 @@
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.7.2.tgz",
       "integrity": "sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg==",
-      "peer": true
+      "dev": true
     },
     "node_modules/slash": {
       "version": "2.0.0",
@@ -4911,12 +4904,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/ultron": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
-      "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
-      "peer": true
-    },
     "node_modules/unicode-canonical-property-names-ecmascript": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
@@ -5153,12 +5140,24 @@
       "dev": true
     },
     "node_modules/ws": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
-      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
-      "peer": true,
-      "dependencies": {
-        "async-limiter": "~1.0.0"
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.3.tgz",
+      "integrity": "sha512-hr6vCR76GsossIRsr8OLR9acVVm1jyfEWvhbNjtgPOrfvAlKzvyeg/P6r8RuDjRyrcQoPQT7K0DGEPc7Ae6jzA==",
+      "dev": true,
+      "engines": {
+        "node": ">=8.3.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": "^5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
       }
     },
     "node_modules/y18n": {
@@ -6586,12 +6585,6 @@
       "dev": true,
       "optional": true
     },
-    "async-limiter": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
-      "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ==",
-      "peer": true
-    },
     "atob": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
@@ -8510,26 +8503,13 @@
       }
     },
     "react-devtools-core": {
-      "version": "3.6.3",
-      "resolved": "https://registry.npmjs.org/react-devtools-core/-/react-devtools-core-3.6.3.tgz",
-      "integrity": "sha512-+P+eFy/yo8Z/UH9J0DqHZuUM5+RI2wl249TNvMx3J2jpUomLQa4Zxl56GEotGfw3PIP1eI+hVf1s53FlUONStQ==",
-      "peer": true,
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/react-devtools-core/-/react-devtools-core-4.10.1.tgz",
+      "integrity": "sha512-sXbBjGAWcf9HAblTP/zMtFhGHqxAfIR+GPxONZsSGN9FHnF4635dx1s2LdQWG9rJ+Ehr3nWg+BUAB6P78my5PA==",
+      "dev": true,
       "requires": {
         "shell-quote": "^1.6.1",
-        "ws": "^3.3.1"
-      },
-      "dependencies": {
-        "ws": {
-          "version": "3.3.3",
-          "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
-          "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
-          "peer": true,
-          "requires": {
-            "async-limiter": "~1.0.0",
-            "safe-buffer": "~5.1.0",
-            "ultron": "~1.1.0"
-          }
-        }
+        "ws": "^7"
       }
     },
     "react-reconciler": {
@@ -8785,7 +8765,8 @@
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "dev": true
     },
     "safe-regex": {
       "version": "1.1.0",
@@ -8844,7 +8825,7 @@
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.7.2.tgz",
       "integrity": "sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg==",
-      "peer": true
+      "dev": true
     },
     "slash": {
       "version": "2.0.0",
@@ -9234,12 +9215,6 @@
         "repeat-string": "^1.6.1"
       }
     },
-    "ultron": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
-      "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
-      "peer": true
-    },
     "unicode-canonical-property-names-ecmascript": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
@@ -9429,13 +9404,11 @@
       "dev": true
     },
     "ws": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
-      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
-      "peer": true,
-      "requires": {
-        "async-limiter": "~1.0.0"
-      }
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.3.tgz",
+      "integrity": "sha512-hr6vCR76GsossIRsr8OLR9acVVm1jyfEWvhbNjtgPOrfvAlKzvyeg/P6r8RuDjRyrcQoPQT7K0DGEPc7Ae6jzA==",
+      "dev": true,
+      "requires": {}
     },
     "y18n": {
       "version": "4.0.1",
diff --git a/package.json b/package.json
index 2e82967..9e8bfb7 100644
--- a/package.json
+++ b/package.json
@@ -45,16 +45,24 @@
     "mocha": "^8.2.1",
     "neo-blessed": "^0.2.0",
     "prettier": "^2.2.1",
+    "react-devtools-core": "4.10.1",
     "rollup": "^2.38.5",
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-commonjs": "^10.1.0",
     "rollup-plugin-node-resolve": "^5.2.0"
   },
   "peerDependencies": {
-    "blessed": "^0.1.81",
-    "react": "^17.0.1",
-    "react-devtools-core": "^3.0.0",
-    "ws": "^6.0.0"
+    "blessed": ">=0.1.81 <0.2.0",
+    "react": ">=17.0.1 <18.0.0",
+    "react-devtools-core": ">=4.10.1 <5.0.0"
+  },
+  "peerDependenciesMeta": {
+    "blessed": {
+      "optional": true
+    },
+    "react-devtools-core": {
+      "optional": true
+    }
   },
   "dependencies": {
     "react": "^17.0.1",
diff --git a/src/fiber/devtools.js b/src/fiber/devtools.js
index b2d5f5c..e5ae718 100644
--- a/src/fiber/devtools.js
+++ b/src/fiber/devtools.js
@@ -1,6 +1,11 @@
 /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 
+module.exports = {
+  version: require('react').version
+};
+
 try {
+  require.resolve('react-devtools-core');
   const defineProperty = Object.defineProperty;
   defineProperty(global, 'WebSocket', {
     value: require('ws')
@@ -20,9 +25,5 @@ try {
     resolveRNStyle: null // TODO maybe: require('flattenStyle')
   });
 } catch (err) {
-  if (process.env.NODE_ENV !== 'production') {
-    console.warn(
-      'WARNING: the `ws` package must be installed to use `react-devtools`.'
-    );
-  }
+  // no devtools installed...
 }