diff --git a/packages/nodejs/.changesets/log-stdout-on-heroku.md b/packages/nodejs/.changesets/log-stdout-on-heroku.md
new file mode 100644
index 00000000..f6e02620
--- /dev/null
+++ b/packages/nodejs/.changesets/log-stdout-on-heroku.md
@@ -0,0 +1,5 @@
+---
+bump: "patch"
+---
+
+Default log output to app STDOUT on Heroku dyno's. This makes the AppSignal logs available in the Heroku app's logs.
diff --git a/packages/nodejs/src/__tests__/config.test.ts b/packages/nodejs/src/__tests__/config.test.ts
index bc370cfc..2ca2b7a2 100644
--- a/packages/nodejs/src/__tests__/config.test.ts
+++ b/packages/nodejs/src/__tests__/config.test.ts
@@ -62,6 +62,23 @@ describe("Configuration", () => {
       expect(config.data).toEqual(expectedDefaultConfig)
 
       expect(config.sources.default).toEqual(expectedDefaultConfig)
+      expect(config.sources.system).toEqual({})
+      expect(config.sources.initial).toEqual({})
+      expect(config.sources.env).toEqual({})
+    })
+  })
+
+  describe("system values", () => {
+    it("sets log output to stdout on Heroku", () => {
+      process.env.DYNO = "web.1"
+      const systemConfig = { log: "stdout" }
+      config = new Configuration({})
+      delete process.env.DYNO
+
+      expect(config.data).toEqual({ ...expectedDefaultConfig, ...systemConfig })
+
+      expect(config.sources.default).toEqual(expectedDefaultConfig)
+      expect(config.sources.system).toEqual(systemConfig)
       expect(config.sources.initial).toEqual({})
       expect(config.sources.env).toEqual({})
     })
@@ -84,6 +101,7 @@ describe("Configuration", () => {
       expect(config.data).toEqual(options)
 
       expect(config.sources.default).toEqual(expectedDefaultConfig)
+      expect(config.sources.system).toEqual({})
       expect(config.sources.initial).toEqual(initialOptions)
       expect(config.sources.env).toEqual({})
     })
@@ -106,6 +124,7 @@ describe("Configuration", () => {
       expect(config.data).toEqual(expectedConfig)
 
       expect(config.sources.default).toEqual(expectedDefaultConfig)
+      expect(config.sources.system).toEqual({})
       expect(config.sources.initial).toEqual({})
       expect(config.sources.env).toEqual(envOptions)
     })
diff --git a/packages/nodejs/src/config.ts b/packages/nodejs/src/config.ts
index efe18ca5..04eb9dee 100644
--- a/packages/nodejs/src/config.ts
+++ b/packages/nodejs/src/config.ts
@@ -28,6 +28,7 @@ export class Configuration {
     }
     this.sources = {
       default: this._defaultValues(),
+      system: this._systemValues(),
       env: this._loadFromEnvironment(),
       initial: options
     }
@@ -94,6 +95,19 @@ export class Configuration {
     }
   }
 
+  /**
+   * Config options based on the host environment.
+   *
+   * @private
+   */
+  private _systemValues(): { [key: string]: any } {
+    const config = {} as { [key: string]: any }
+    if (process.env.DYNO) {
+      config["log"] = "stdout"
+    }
+    return config
+  }
+
   /**
    * Loads environment variables into a key-value structure.
    *
diff --git a/test/integration/diagnose b/test/integration/diagnose
index 497d875f..d31c4d99 160000
--- a/test/integration/diagnose
+++ b/test/integration/diagnose
@@ -1 +1 @@
-Subproject commit 497d875f2d812e1c001f4052f6904a463993b14e
+Subproject commit d31c4d9970d3118cc17a057d902b9fd38c03e5c6