diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 59fada5d4f..15a7ac872b 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -1,5 +1,5 @@
 variables:
-  DENO_VERSION: "v0.3.10"
+  DENO_VERSION: "v0.4.0"
   TS_VERSION: "3.4.5"
 
 # TODO DRY up the jobs
@@ -13,8 +13,8 @@ jobs:
       - script: curl -L https://deno.land/x/install/install.sh | sh -s $(DENO_VERSION)
       - script: echo '##vso[task.prependpath]$(HOME)/.deno/bin/'
       - script: npx eslint **/*.ts --max-warnings=0
-      - script: deno --allow-run --allow-write --allow-read format.ts --check
-      - script: deno --allow-run --allow-net --allow-write --allow-read test.ts
+      - script: deno run --allow-run --allow-write --allow-read format.ts --check
+      - script: deno run --allow-run --allow-net --allow-write --allow-read test.ts
 
   - job: "Mac"
     pool:
@@ -24,8 +24,8 @@ jobs:
       - script: curl -L https://deno.land/x/install/install.sh | sh -s $(DENO_VERSION)
       - script: echo '##vso[task.prependpath]$(HOME)/.deno/bin/'
       - script: eslint **/*.ts --max-warnings=0
-      - script: deno --allow-run --allow-write --allow-read format.ts --check
-      - script: deno --allow-run --allow-net --allow-write --allow-read test.ts
+      - script: deno run --allow-run --allow-write --allow-read format.ts --check
+      - script: deno run --allow-run --allow-net --allow-write --allow-read test.ts
 
   - job: "Windows"
     pool:
@@ -35,5 +35,5 @@ jobs:
       - powershell: iwr https://deno.land/x/install/install.ps1 -out install.ps1; .\install.ps1 $(DENO_VERSION)
       - bash: echo "##vso[task.prependpath]C:\Users\VssAdministrator\.deno\\bin"
       - bash: npx eslint **/*.ts --max-warnings=0
-      - bash: deno.exe --allow-run --allow-write --allow-read format.ts --check
-      - bash: deno.exe --allow-run --allow-net --allow-write --allow-read test.ts
+      - bash: deno.exe run --allow-run --allow-write --allow-read format.ts --check
+      - bash: deno.exe run --allow-run --allow-net --allow-write --allow-read test.ts
diff --git a/examples/test.ts b/examples/test.ts
index 17d19a312b..8158763be5 100644
--- a/examples/test.ts
+++ b/examples/test.ts
@@ -15,7 +15,7 @@ test(function t2(): void {
 /** A more complicated test that runs a subprocess. */
 test(async function catSmoke(): Promise<void> {
   const p = run({
-    args: ["deno", "--allow-read", "examples/cat.ts", "README.md"],
+    args: ["deno", "run", "--allow-read", "examples/cat.ts", "README.md"],
     stdout: "piped"
   });
   const s = await p.status();
diff --git a/format.ts b/format.ts
index 80bde59ded..1965044cc3 100755
--- a/format.ts
+++ b/format.ts
@@ -7,6 +7,7 @@ import { xrun } from "./prettier/util.ts";
 async function main(opts): Promise<void> {
   const args = [
     execPath,
+    "run",
     "--allow-write",
     "--allow-read",
     "prettier/main.ts",
diff --git a/http/file_server_test.ts b/http/file_server_test.ts
index b976c0dc0e..38071d3e4b 100644
--- a/http/file_server_test.ts
+++ b/http/file_server_test.ts
@@ -11,6 +11,7 @@ async function startFileServer(): Promise<void> {
   fileServer = run({
     args: [
       "deno",
+      "run",
       "--allow-read",
       "--allow-net",
       "http/file_server.ts",
diff --git a/http/racing_server_test.ts b/http/racing_server_test.ts
index 0c1a5c65f6..cdcdca1a74 100644
--- a/http/racing_server_test.ts
+++ b/http/racing_server_test.ts
@@ -8,7 +8,7 @@ import { TextProtoReader } from "../textproto/mod.ts";
 let server;
 async function startServer(): Promise<void> {
   server = run({
-    args: ["deno", "-A", "http/racing_server.ts"],
+    args: ["deno", "run", "-A", "http/racing_server.ts"],
     stdout: "piped"
   });
   // Once fileServer is ready it will write to its stdout.
diff --git a/prettier/main_test.ts b/prettier/main_test.ts
index 0c8cca7129..0c6653a3cf 100644
--- a/prettier/main_test.ts
+++ b/prettier/main_test.ts
@@ -20,6 +20,7 @@ async function run(
 
 const cmd = [
   execPath,
+  "run",
   "--allow-run",
   "--allow-write",
   "--allow-read",