diff --git a/package.json b/package.json
index 7f15e9b..ba88789 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "@sourcegraph/vscode-ws-jsonrpc": "^0.0.3-fork",
     "lodash": "^4.17.11",
     "rxjs": "^6.4.0",
-    "sourcegraph": "^22.0.0",
+    "sourcegraph": "^23.0.0",
     "type-zoo": "^3.2.1",
     "uuid": "^3.3.2",
     "vscode-languageserver-protocol": "^3.14.1",
diff --git a/src/index.ts b/src/index.ts
index f3f3613..7c7b941 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -118,7 +118,7 @@ export async function register({
                 textDocument: {
                     uri: serverTextDocumentUri.href,
                     languageId: textDocument.languageId,
-                    text: textDocument.text,
+                    text: textDocument.text || '', // TODO try to fetch contents from somewhere
                     version: 1,
                 },
             }
diff --git a/src/test/integration.test.ts b/src/test/integration.test.ts
index b16a8cf..d6aa39b 100644
--- a/src/test/integration.test.ts
+++ b/src/test/integration.test.ts
@@ -25,7 +25,7 @@ const logger = new NoopLogger()
 describe('register()', () => {
     it('should initialize one connection with each workspace folder if the server is multi-root capable', async () => {
         const sourcegraph = createMockSourcegraphAPI()
-        sourcegraph.workspace.roots = [{ uri: 'git://repo1?rev' }, { uri: 'git://repo2?rev' }]
+        sourcegraph.workspace.roots = [{ uri: new URL('git://repo1?rev') }, { uri: new URL('git://repo2?rev') }]
         const server = {
             initialize: sinon.spy((params: InitializeParams): InitializeResult => ({ capabilities: {} })),
         }
@@ -49,7 +49,7 @@ describe('register()', () => {
     })
     it('should initialize one connection for each workspace folder if the server is not multi-root capable', async () => {
         const sourcegraph = createMockSourcegraphAPI()
-        sourcegraph.workspace.roots = [{ uri: 'git://repo1?rev' }, { uri: 'git://repo2?rev' }]
+        sourcegraph.workspace.roots = [{ uri: new URL('git://repo1?rev') }, { uri: new URL('git://repo2?rev') }]
         const server = {
             initialize: sinon.spy((params: InitializeParams): InitializeResult => ({ capabilities: {} })),
         }
@@ -80,7 +80,7 @@ describe('register()', () => {
     })
     it('should close a connection when a workspace folder is closed', async () => {
         const sourcegraph = createMockSourcegraphAPI()
-        sourcegraph.workspace.roots = [{ uri: 'git://repo1?rev' }, { uri: 'git://repo2?rev' }]
+        sourcegraph.workspace.roots = [{ uri: new URL('git://repo1?rev') }, { uri: new URL('git://repo2?rev') }]
         const server = {
             initialize: sinon.spy((params: InitializeParams): InitializeResult => ({ capabilities: {} })),
         }
@@ -99,7 +99,7 @@ describe('register()', () => {
         sinon.assert.calledOnce(createConnection.returnValues[0].unsubscribe)
     })
     it('should register a references provider if the server reports the references capability', async () => {
-        const repoRoot = 'https://sourcegraph.test/repo@rev/-/raw/'
+        const repoRoot = new URL('https://sourcegraph.test/repo@rev/-/raw/')
         const server = {
             initialize: sinon.spy(
                 (params: InitializeParams): InitializeResult => ({
@@ -180,7 +180,7 @@ describe('register()', () => {
         ])
     })
     it('should register a definition provider if the server reports the definition capability', async () => {
-        const repoRoot = 'https://sourcegraph.test/repo@rev/-/raw/'
+        const repoRoot = new URL('https://sourcegraph.test/repo@rev/-/raw/')
         const server = {
             initialize: sinon.spy(
                 (params: InitializeParams): InitializeResult => ({
@@ -257,7 +257,7 @@ describe('register()', () => {
         ])
     })
     it('should register a hover provider if the server reports the hover capability', async () => {
-        const repoRoot = 'https://sourcegraph.test/repo@rev/-/raw/'
+        const repoRoot = new URL('https://sourcegraph.test/repo@rev/-/raw/')
         const server = {
             initialize: sinon.spy(
                 async (params: InitializeParams): Promise<InitializeResult> => ({
diff --git a/yarn.lock b/yarn.lock
index cb5d628..6cbe7c9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5233,10 +5233,10 @@ source-map@^0.6.0, source-map@^0.6.1, source-map@~0.6.1:
   resolved "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
   integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
 
-sourcegraph@^22.0.0:
-  version "22.0.0"
-  resolved "https://registry.npmjs.org/sourcegraph/-/sourcegraph-22.0.0.tgz#b259929c31bf367f5160056698a881dc26eb36bd"
-  integrity sha512-cJHby0OPCM0y0BmRTKhY89D02f9koROluHMJGQGNE8q9CoIVbe1s6ctHCytz7bjY9mKtCpQMbtxYQhfIm5S4lg==
+sourcegraph@^23.0.0:
+  version "23.0.0"
+  resolved "https://registry.yarnpkg.com/sourcegraph/-/sourcegraph-23.0.0.tgz#1fb96015af3e84cc9cc2944823f04a7e952ed565"
+  integrity sha512-hQALHrTt+AK5ZAqUAUNhxO7ClSv/xyTjMQPBb+hQykKJrMaHTk+CnJNHs7dRfXYKnbnZeisQRjaxKGX8UecU0Q==
 
 spawn-error-forwarder@~1.0.0:
   version "1.0.0"