diff --git a/bin/utils.js b/bin/utils.js
index 6f56f7b..256694a 100644
--- a/bin/utils.js
+++ b/bin/utils.js
@@ -171,7 +171,7 @@ const pingTimeout = 30000
  * @param {any} req
  * @param {any} opts
  */
-exports.setupWSConnection = (conn, req, { docName = req.url.slice(1), gc = true } = {}) => {
+exports.setupWSConnection = (conn, req, { docName = req.url.slice(1).split('?')[0], gc = true } = {}) => {
   conn.binaryType = 'arraybuffer'
   // get doc, create if it does not exist yet
   const doc = map.setIfUndefined(docs, docName, () => {
diff --git a/package-lock.json b/package-lock.json
index 7d2c77f..39636ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,9 +11,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "13.1.6",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-13.1.6.tgz",
-      "integrity": "sha512-Jg1F+bmxcpENHP23sVKkNuU3uaxPnsBMW0cLjleiikFKomJQbsn0Cqk2yDvQArqzZN6ABfBkZ0To7pQ8sLdWDg==",
+      "version": "13.7.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-13.7.2.tgz",
+      "integrity": "sha512-uvilvAQbdJvnSBFcKJ2td4016urcGvsiR+N4dHGU87ml8O2Vl6l+ErOi9w0kXSPiwJ1AYlIW+0pDXDWWMOiWbw==",
       "dev": true
     },
     "acorn": {
@@ -976,11 +976,18 @@
       }
     },
     "lib0": {
-      "version": "0.2.3",
-      "resolved": "https://registry.npmjs.org/lib0/-/lib0-0.2.3.tgz",
-      "integrity": "sha512-J1Gw9PT78tO3QODgvzk9NVTXTXTsru9LKq+iPOdWw5s1/QiapUKmCJMCWBrNSGkJ0f3WQkZJtGzn3azJwMDdeg==",
+      "version": "0.2.15",
+      "resolved": "https://registry.npmjs.org/lib0/-/lib0-0.2.15.tgz",
+      "integrity": "sha512-wLwuTNNgtC7EQH0b3w4iqpts69TRFVur74Wta7jwgS2w+r/vPLuGcsBA16VoPgBYME7oxDSjEesJw9p/gHmFEg==",
       "requires": {
-        "isomorphic.js": "^0.1.0"
+        "isomorphic.js": "^0.1.3"
+      },
+      "dependencies": {
+        "isomorphic.js": {
+          "version": "0.1.3",
+          "resolved": "https://registry.npmjs.org/isomorphic.js/-/isomorphic.js-0.1.3.tgz",
+          "integrity": "sha512-pabBRLDwYefSsNS+qCazJ97o7P5xDTrNoxSYFTM09JlZTxPrOEPGKekwqUy3/Np4C4PHnVUXHYsZPOix0jELsA=="
+        }
       }
     },
     "load-json-file": {
@@ -1387,9 +1394,9 @@
       }
     },
     "rollup": {
-      "version": "1.29.0",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.29.0.tgz",
-      "integrity": "sha512-V63Iz0dSdI5qPPN5HmCN6OBRzBFhMqNWcvwgq863JtSCTU6Vdvqq6S2fYle/dSCyoPrBkIP3EIr1RVs3HTRqqg==",
+      "version": "1.31.1",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.31.1.tgz",
+      "integrity": "sha512-2JREN1YdrS/kpPzEd33ZjtuNbOuBC3ePfuZBdKEybvqcEcszW1ckyVqzcEiEe0nE8sqHK+pbJg+PsAgRJ8+1dg==",
       "dev": true,
       "requires": {
         "@types/estree": "*",
@@ -1648,9 +1655,9 @@
       }
     },
     "typescript": {
-      "version": "3.7.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.4.tgz",
-      "integrity": "sha512-A25xv5XCtarLwXpcDNZzCGvW2D1S3/bACratYBx2sax8PefsFhlYmkQicKHvpYflFS8if4zne5zT5kpJ7pzuvw==",
+      "version": "3.7.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.5.tgz",
+      "integrity": "sha512-/P5lkRXkWHNAbcJIiHPfRoKqyd7bsyCma1hZNUGfn20qm64T6ZBlrzprymeu918H+mB/0rIg2gGK/BXkhhYgBw==",
       "dev": true
     },
     "uniq": {
diff --git a/package.json b/package.json
index 34dd579..017d12b 100644
--- a/package.json
+++ b/package.json
@@ -40,14 +40,14 @@
     ]
   },
   "dependencies": {
-    "lib0": "^0.2.3",
+    "lib0": "^0.2.15",
     "y-protocols": "^0.2.0"
   },
   "devDependencies": {
-    "rollup": "^1.29.0",
+    "rollup": "^1.31.1",
     "rollup-cli": "^1.0.9",
     "standard": "^12.0.1",
-    "typescript": "^3.7.4",
+    "typescript": "^3.7.5",
     "yjs": "13.0.0-105"
   },
   "peerDependenies": {
diff --git a/src/y-websocket.js b/src/y-websocket.js
index 4f13f81..dd8044a 100644
--- a/src/y-websocket.js
+++ b/src/y-websocket.js
@@ -19,6 +19,7 @@ import * as awarenessProtocol from 'y-protocols/awareness.js'
 import * as mutex from 'lib0/mutex.js'
 import { Observable } from 'lib0/observable.js'
 import * as math from 'lib0/math.js'
+import * as url from 'lib0/url.js'
 
 const messageSync = 0
 const messageQueryAwareness = 3
@@ -164,18 +165,19 @@ const broadcastMessage = (provider, buf) => {
  */
 export class WebsocketProvider extends Observable {
   /**
-   * @param {string} url
+   * @param {string} serverUrl
    * @param {string} roomname
    * @param {Y.Doc} doc
-   * @param {{connect:boolean,awareness:awarenessProtocol.Awareness,db:any|null}} conf
+   * @param {{connect:boolean,awareness:awarenessProtocol.Awareness,db:any|null,params:Object<string,string>}} conf
    */
-  constructor (url, roomname, doc, { connect = true, awareness = new awarenessProtocol.Awareness(doc), db = null } = /** @type {any} */ ({})) {
+  constructor (serverUrl, roomname, doc, { connect = true, awareness = new awarenessProtocol.Awareness(doc), db = null, params = {} } = /** @type {any} */ ({})) {
     super()
     // ensure that url is always ends with /
-    while (url[url.length - 1] === '/') {
-      url = url.slice(0, url.length - 1)
+    while (serverUrl[serverUrl.length - 1] === '/') {
+      serverUrl = serverUrl.slice(0, serverUrl.length - 1)
     }
-    this.url = url + '/' + roomname
+    const encodedParams = url.encodeQueryParams(params)
+    this.url = serverUrl + '/' + roomname + (encodedParams.length === 0 ? '' : '&' + encodedParams)
     this.roomname = roomname
     this.doc = doc
     /**