diff --git a/lib/index.ts b/lib/index.ts
index 4191cb5..1031fce 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -18,6 +18,9 @@ enum RequestType {
   REMOTE_DISCONNECT = 4,
   REMOTE_FETCH = 5,
   SERVER_SIDE_EMIT = 6,
+  BROADCAST,
+  BROADCAST_CLIENT_COUNT,
+  BROADCAST_ACK,
 }
 
 interface Request {
@@ -29,6 +32,11 @@ interface Request {
   [other: string]: any;
 }
 
+interface AckRequest {
+  clientCountCallback: (clientCount: number) => void;
+  ack: (...args: any[]) => void;
+}
+
 const isNumeric = (str) => !isNaN(str) && !isNaN(parseFloat(str));
 
 export interface RedisAdapterOptions {
@@ -84,6 +92,7 @@ export class RedisAdapter extends Adapter {
   private readonly requestChannel: string;
   private readonly responseChannel: string;
   private requests: Map<string, Request> = new Map();
+  private ackRequests: Map<string, AckRequest> = new Map();
 
   /**
    * Adapter constructor.
@@ -127,7 +136,8 @@ export class RedisAdapter extends Adapter {
         [this.requestChannel, this.responseChannel, specificResponseChannel],
         (msg, channel) => {
           this.onrequest(channel, msg);
-        }
+        },
+        true
       );
     } else {
       this.subClient.psubscribe(this.channel + "*");
@@ -212,7 +222,12 @@ export class RedisAdapter extends Adapter {
     let request;
 
     try {
-      request = JSON.parse(msg);
+      // if the buffer starts with a "{" character
+      if (msg[0] === 0x7b) {
+        request = JSON.parse(msg.toString());
+      } else {
+        request = msgpack.decode(msg);
+      }
     } catch (err) {
       debug("ignoring malformed request");
       return;
@@ -379,6 +394,47 @@ export class RedisAdapter extends Adapter {
         this.nsp._onServerSideEmit(request.data);
         break;
 
+      case RequestType.BROADCAST: {
+        if (this.ackRequests.has(request.requestId)) {
+          // ignore self
+          return;
+        }
+
+        const opts = {
+          rooms: new Set<Room>(request.opts.rooms),
+          except: new Set<Room>(request.opts.except),
+        };
+
+        super.broadcastWithAck(
+          request.packet,
+          opts,
+          (clientCount) => {
+            debug("waiting for %d client acknowledgements", clientCount);
+            this.publishResponse(
+              request,
+              JSON.stringify({
+                type: RequestType.BROADCAST_CLIENT_COUNT,
+                requestId: request.requestId,
+                clientCount,
+              })
+            );
+          },
+          (arg) => {
+            debug("received acknowledgement with value %j", arg);
+
+            this.publishResponse(
+              request,
+              msgpack.encode({
+                type: RequestType.BROADCAST_ACK,
+                requestId: request.requestId,
+                packet: arg,
+              })
+            );
+          }
+        );
+        break;
+      }
+
       default:
         debug("ignoring unknown request type: %s", request.type);
     }
@@ -407,7 +463,12 @@ export class RedisAdapter extends Adapter {
     let response;
 
     try {
-      response = JSON.parse(msg);
+      // if the buffer starts with a "{" character
+      if (msg[0] === 0x7b) {
+        response = JSON.parse(msg.toString());
+      } else {
+        response = msgpack.decode(msg);
+      }
     } catch (err) {
       debug("ignoring malformed response");
       return;
@@ -415,7 +476,27 @@ export class RedisAdapter extends Adapter {
 
     const requestId = response.requestId;
 
-    if (!requestId || !this.requests.has(requestId)) {
+    if (this.ackRequests.has(requestId)) {
+      const ackRequest = this.ackRequests.get(requestId);
+
+      switch (response.type) {
+        case RequestType.BROADCAST_CLIENT_COUNT: {
+          ackRequest?.clientCountCallback(response.clientCount);
+          break;
+        }
+
+        case RequestType.BROADCAST_ACK: {
+          ackRequest?.ack(response.packet);
+          break;
+        }
+      }
+      return;
+    }
+
+    if (
+      !requestId ||
+      !(this.requests.has(requestId) || this.ackRequests.has(requestId))
+    ) {
       debug("ignoring unknown request");
       return;
     }
@@ -526,6 +607,50 @@ export class RedisAdapter extends Adapter {
     super.broadcast(packet, opts);
   }
 
+  public broadcastWithAck(
+    packet: any,
+    opts: BroadcastOptions,
+    clientCountCallback: (clientCount: number) => void,
+    ack: (...args: any[]) => void
+  ) {
+    packet.nsp = this.nsp.name;
+
+    const onlyLocal = opts?.flags?.local;
+
+    if (!onlyLocal) {
+      const requestId = uid2(6);
+
+      const rawOpts = {
+        rooms: [...opts.rooms],
+        except: [...new Set(opts.except)],
+        flags: opts.flags,
+      };
+
+      const request = msgpack.encode({
+        uid: this.uid,
+        requestId,
+        type: RequestType.BROADCAST,
+        packet,
+        opts: rawOpts,
+      });
+
+      this.pubClient.publish(this.requestChannel, request);
+
+      this.ackRequests.set(requestId, {
+        clientCountCallback,
+        ack,
+      });
+
+      // we have no way to know at this level whether the server has received an acknowledgement from each client, so we
+      // will simply clean up the ackRequests map after the given delay
+      setTimeout(() => {
+        this.ackRequests.delete(requestId);
+      }, opts.flags!.timeout);
+    }
+
+    super.broadcastWithAck(packet, opts, clientCountCallback, ack);
+  }
+
   /**
    * Gets a list of sockets by sid.
    *
@@ -955,4 +1080,8 @@ export class RedisAdapter extends Adapter {
       });
     }
   }
+
+  serverCount(): Promise<number> {
+    return this.getNumSub();
+  }
 }
diff --git a/package-lock.json b/package-lock.json
index e590ff0..046a481 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,8 +1,2520 @@
 {
   "name": "@socket.io/redis-adapter",
   "version": "7.1.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "name": "@socket.io/redis-adapter",
+      "version": "7.1.0",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "~4.3.1",
+        "notepack.io": "~2.2.0",
+        "socket.io-adapter": "^2.4.0",
+        "uid2": "0.0.3"
+      },
+      "devDependencies": {
+        "@types/expect.js": "^0.3.29",
+        "@types/mocha": "^8.2.1",
+        "@types/node": "^14.14.7",
+        "expect.js": "0.3.1",
+        "ioredis": "^4.0.0",
+        "mocha": "^3.4.2",
+        "nyc": "^15.1.0",
+        "prettier": "^2.1.2",
+        "redis": "^4.0.0",
+        "redis-v3": "npm:redis@^3.1.2",
+        "socket.io": "^4.5.0",
+        "socket.io-client": "^4.1.1",
+        "ts-node": "^9.1.1",
+        "typescript": "^4.0.5"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "node_modules/@babel/core": {
+      "version": "7.12.3",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.12.3.tgz",
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+        "type": "opencollective",
+        "url": "https://opencollective.com/babel"
+      }
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+      "dev": true,
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+        "semver": "bin/semver"
+      }
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+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.1.tgz",
+      "integrity": "sha512-XW/Aa8APYr6jSVVA1y/DEIZX0/GMKLEVekNG727R8cs56ahETkRAy/3DR7+fJyh7oUgGwNQaRfXCun0+KbWY7Q==",
       "dev": true
     },
     "@types/cors": {
-      "version": "2.8.10",
-      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.10.tgz",
-      "integrity": "sha512-C7srjHiVG3Ey1nR6d511dtDkCEjxuN9W1HWAEjGq8kpcwmNM6JJkpC0xvabM7BXTG2wDq8Eu33iH9aQKa7IvLQ==",
+      "version": "2.8.12",
+      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.12.tgz",
+      "integrity": "sha512-vt+kDhq/M2ayberEtJcIN/hxXy1Pk+59g2FV/ZQceeaTyCtCucjL2Q7FXlFjtWn4n15KCr1NE2lNNFhp0lEThw==",
       "dev": true
     },
     "@types/expect.js": {
@@ -303,13 +2823,13 @@
       "dev": true
     },
     "accepts": {
-      "version": "1.3.7",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
-      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
       "dev": true,
       "requires": {
-        "mime-types": "~2.1.24",
-        "negotiator": "0.6.2"
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
       }
     },
     "aggregate-error": {
@@ -534,9 +3054,9 @@
       }
     },
     "cookie": {
-      "version": "0.4.1",
-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.1.tgz",
-      "integrity": "sha512-ZwrFkGJxUR3EIoXtO+yVE69Eb7KlixbaeAWfBQB9vVsNn/o+Yw69gBWSSDK825hQNdN+wF8zELf3dFNl/kxkUA==",
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.2.tgz",
+      "integrity": "sha512-aSWTXFzaKWkvHO1Ny/s+ePFpvKsPnjc551iI41v3ny/ow6tBG5Vd+FuqGNhh1LxOmVzOlGUriIlOaokOvhaStA==",
       "dev": true
     },
     "cors": {
@@ -567,9 +3087,9 @@
       }
     },
     "debug": {
-      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
-      "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
       "requires": {
         "ms": "2.1.2"
       }
@@ -608,18 +3128,39 @@
       "dev": true
     },
     "engine.io": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-5.1.0.tgz",
-      "integrity": "sha512-A2i4kVvOA3qezQLlMz+FayGFdqOo0LP3fYrb0VqXMDXKoXcbgM0KxcEYnsdVzOMJQErIAb1GIStRj7UWFoiqlQ==",
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.2.0.tgz",
+      "integrity": "sha512-4KzwW3F3bk+KlzSOY57fj/Jx6LyRQ1nbcyIadehl+AnXjKT7gDO0ORdRi/84ixvMKTym6ZKuxvbzN62HDDU1Lg==",
       "dev": true,
       "requires": {
+        "@types/cookie": "^0.4.1",
+        "@types/cors": "^2.8.12",
+        "@types/node": ">=10.0.0",
         "accepts": "~1.3.4",
         "base64id": "2.0.0",
         "cookie": "~0.4.1",
         "cors": "~2.8.5",
         "debug": "~4.3.1",
-        "engine.io-parser": "~4.0.0",
-        "ws": "~7.4.2"
+        "engine.io-parser": "~5.0.3",
+        "ws": "~8.2.3"
+      },
+      "dependencies": {
+        "engine.io-parser": {
+          "version": "5.0.3",
+          "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-5.0.3.tgz",
+          "integrity": "sha512-BtQxwF27XUNnSafQLvDi0dQ8s3i6VgzSoQMJacpIcGNrlUdfHSKbgm3jmjCVvQluGzqwujQMPAoMai3oYSTurg==",
+          "dev": true,
+          "requires": {
+            "@socket.io/base64-arraybuffer": "~1.0.2"
+          }
+        },
+        "ws": {
+          "version": "8.2.3",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-8.2.3.tgz",
+          "integrity": "sha512-wBuoj1BDpC6ZQ1B7DWQBYVLphPWkm8i9Y0/3YdHjHKHiohOJ1ws+3OccDWtH+PoC9DZD5WOTrJvNbWvjS6JWaA==",
+          "dev": true,
+          "requires": {}
+        }
       }
     },
     "engine.io-client": {
@@ -1182,18 +3723,18 @@
       "dev": true
     },
     "mime-db": {
-      "version": "1.47.0",
-      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.47.0.tgz",
-      "integrity": "sha512-QBmA/G2y+IfeS4oktet3qRZ+P5kPhCKRXxXnQEudYqUaEioAU1/Lq2us3D/t1Jfo4hE9REQPrbB7K5sOczJVIw==",
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
       "dev": true
     },
     "mime-types": {
-      "version": "2.1.30",
-      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.30.tgz",
-      "integrity": "sha512-crmjA4bLtR8m9qLpHvgxSChT+XoSlZi8J4n/aIdn3z92e/U47Z0V/yl+Wh9W046GgFVAmoNR/fmdbZYcSSIUeg==",
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
       "dev": true,
       "requires": {
-        "mime-db": "1.47.0"
+        "mime-db": "1.52.0"
       }
     },
     "minimatch": {
@@ -1263,9 +3804,9 @@
       "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
     },
     "negotiator": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
-      "integrity": "sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==",
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
+      "integrity": "sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg==",
       "dev": true
     },
     "node-preload": {
@@ -1613,26 +4154,23 @@
       "dev": true
     },
     "socket.io": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-4.1.1.tgz",
-      "integrity": "sha512-YKPdhaYRGEXjP+VqoKlfOEPgDjm0aMq1YWonjHg4rBU1xJCmgceNh2XL1vO4czWupH+WX1+d9Wqb768h7BC5kw==",
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-4.5.0.tgz",
+      "integrity": "sha512-slTYqU2jCgMjXwresG8grhUi/cC6GjzmcfqArzaH3BN/9I/42eZk9yamNvZJdBfTubkjEdKAKs12NEztId+bUA==",
       "dev": true,
       "requires": {
-        "@types/cookie": "^0.4.0",
-        "@types/cors": "^2.8.8",
-        "@types/node": ">=10.0.0",
         "accepts": "~1.3.4",
         "base64id": "~2.0.0",
-        "debug": "~4.3.1",
-        "engine.io": "~5.1.0",
-        "socket.io-adapter": "~2.3.0",
-        "socket.io-parser": "~4.0.3"
+        "debug": "~4.3.2",
+        "engine.io": "~6.2.0",
+        "socket.io-adapter": "~2.4.0",
+        "socket.io-parser": "~4.0.4"
       }
     },
     "socket.io-adapter": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.3.0.tgz",
-      "integrity": "sha512-jdIbSFRWOkaZpo5mXy8T7rXEN6qo3bOFuq4nVeX1ZS7AtFlkbk39y153xTXEIW7W94vZfhVOux1wTU88YxcM1w=="
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.4.0.tgz",
+      "integrity": "sha512-W4N+o69rkMEGVuk2D/cvca3uYsvGlMwsySWV447y99gUPghxq42BxqLNMndb+a1mm/5/7NeXVQS7RLa2XyXvYg=="
     },
     "socket.io-client": {
       "version": "4.1.1",
@@ -1912,7 +4450,8 @@
       "version": "7.4.6",
       "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.6.tgz",
       "integrity": "sha512-YmhHDO4MzaDLB+M9ym/mDA5z0naX8j7SIlT8f8z+I0VtzsRbekxEutHSme7NPS2qE8StCYQNUnfWdXta/Yu85A==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "y18n": {
       "version": "4.0.1",
diff --git a/package.json b/package.json
index 68e5749..a4c9db2 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
   "dependencies": {
     "debug": "~4.3.1",
     "notepack.io": "~2.2.0",
-    "socket.io-adapter": "~2.3.0",
+    "socket.io-adapter": "^2.4.0",
     "uid2": "0.0.3"
   },
   "devDependencies": {
@@ -39,7 +39,7 @@
     "prettier": "^2.1.2",
     "redis": "^4.0.0",
     "redis-v3": "npm:redis@^3.1.2",
-    "socket.io": "^4.1.1",
+    "socket.io": "^4.5.0",
     "socket.io-client": "^4.1.1",
     "ts-node": "^9.1.1",
     "typescript": "^4.0.5"
diff --git a/test/index.ts b/test/index.ts
index 0272ac4..9c39496 100644
--- a/test/index.ts
+++ b/test/index.ts
@@ -120,6 +120,90 @@ describe(`socket.io-redis with ${
     expect(namespace1.adapter.requests.size).to.eql(0);
   });
 
+  it("broadcasts with multiple acknowledgements", (done) => {
+    client1.on("test", (cb) => {
+      cb(1);
+    });
+
+    client2.on("test", (cb) => {
+      cb(2);
+    });
+
+    client3.on("test", (cb) => {
+      cb(3);
+    });
+
+    namespace1.timeout(500).emit("test", (err: Error, responses: any[]) => {
+      expect(err).to.be(null);
+      expect(responses).to.contain(1);
+      expect(responses).to.contain(2);
+      expect(responses).to.contain(3);
+
+      setTimeout(() => {
+        expect(namespace1.adapter.ackRequests.size).to.eql(0);
+
+        done();
+      }, 500);
+    });
+  });
+
+  it("broadcasts with multiple acknowledgements (binary content)", (done) => {
+    client1.on("test", (cb) => {
+      cb(Buffer.from([1]));
+    });
+
+    client2.on("test", (cb) => {
+      cb(Buffer.from([2]));
+    });
+
+    client3.on("test", (cb) => {
+      cb(Buffer.from([3]));
+    });
+
+    namespace1.timeout(500).emit("test", (err: Error, responses: any[]) => {
+      expect(err).to.be(null);
+      responses.forEach((response) => {
+        expect(Buffer.isBuffer(response)).to.be(true);
+      });
+
+      done();
+    });
+  });
+
+  it("broadcasts with multiple acknowledgements (no client)", (done) => {
+    namespace1
+      .to("abc")
+      .timeout(500)
+      .emit("test", (err: Error, responses: any[]) => {
+        expect(err).to.be(null);
+        expect(responses).to.eql([]);
+
+        done();
+      });
+  });
+
+  it("broadcasts with multiple acknowledgements (timeout)", (done) => {
+    client1.on("test", (cb) => {
+      cb(1);
+    });
+
+    client2.on("test", (cb) => {
+      cb(2);
+    });
+
+    client3.on("test", (cb) => {
+      // do nothing
+    });
+
+    namespace1.timeout(500).emit("test", (err: Error, responses: any[]) => {
+      expect(err).to.be.an(Error);
+      expect(responses).to.contain(1);
+      expect(responses).to.contain(2);
+
+      done();
+    });
+  });
+
   if (process.env.REDIS_CLIENT === undefined) {
     // redis@4
     it("ignores messages from unknown channels", (done) => {
@@ -283,7 +367,7 @@ describe(`socket.io-redis with ${
 
     describe("fetchSockets", () => {
       it("returns all socket instances", async () => {
-        socket2.data = "test";
+        socket2.data = "test" as any;
         // @ts-ignore
         socket2.handshake.sessionStore = "not included";