diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1051321ff7..df6788b7f5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Fixes
+
+- Update warm/cold start span ops ([#2487](https://github.com/getsentry/sentry-react-native/pull/2487))
+
 ## 4.4.0
 
 ### Features
diff --git a/src/js/tracing/reactnativetracing.ts b/src/js/tracing/reactnativetracing.ts
index 44dcb03043..be3eaf2c7d 100644
--- a/src/js/tracing/reactnativetracing.ts
+++ b/src/js/tracing/reactnativetracing.ts
@@ -285,7 +285,7 @@ export class ReactNativeTracing implements Integration {
 
     const appStartTimeSeconds = appStart.appStartTime / 1000;
 
-    const appStartMode = appStart.isColdStart ? 'app_start_cold' : 'app_start_warm';
+    const appStartMode = appStart.isColdStart ? 'app.start.cold' : 'app.start.warm';
     transaction.startChild({
       description: appStart.isColdStart ? 'Cold App Start' : 'Warm App Start',
       op: appStartMode,
diff --git a/test/tracing/reactnativetracing.test.ts b/test/tracing/reactnativetracing.test.ts
index 05a9c6cc19..74a6b31049 100644
--- a/test/tracing/reactnativetracing.test.ts
+++ b/test/tracing/reactnativetracing.test.ts
@@ -113,11 +113,11 @@ describe('ReactNativeTracing', () => {
 
             expect(
               // @ts-ignore access private for test
-              transaction._measurements?.app_start_cold?.value
+              transaction._measurements['app.start.cold'].value
             ).toEqual(timeOriginMilliseconds - appStartTimeMilliseconds);
             expect(
               // @ts-ignore access private for test
-              transaction._measurements?.app_start_cold?.unit).toBe('millisecond');
+              transaction._measurements['app.start.cold'].unit).toBe('millisecond');
 
             done();
           }
@@ -162,11 +162,11 @@ describe('ReactNativeTracing', () => {
 
             expect(
               // @ts-ignore access private for test
-              transaction._measurements?.app_start_warm?.value
+              transaction._measurements['app.start.warm'].value
             ).toEqual(timeOriginMilliseconds - appStartTimeMilliseconds);
             expect(
               // @ts-ignore access private for test
-              transaction._measurements?.app_start_warm?.unit).toBe('millisecond');
+              transaction._measurements['app.start.warm'].unit).toBe('millisecond');
 
             done();
           }
@@ -206,12 +206,12 @@ describe('ReactNativeTracing', () => {
           if (transaction) {
             expect(
               // @ts-ignore access private for test
-              transaction._measurements?.app_start_warm
+              transaction._measurements['app.start.warm']
             ).toBeUndefined();
 
             expect(
               // @ts-ignore access private for test
-              transaction._measurements?.app_start_cold
+              transaction._measurements['app.start.cold']
             ).toBeUndefined();
 
             done();
@@ -298,7 +298,7 @@ describe('ReactNativeTracing', () => {
             jest.runOnlyPendingTimers();
 
             // @ts-ignore access private for test
-            expect(routeTransaction._measurements?.app_start_cold?.value).toBe(
+            expect(routeTransaction._measurements['app.start.cold'].value).toBe(
               timeOriginMilliseconds - appStartTimeMilliseconds
             );
 
@@ -314,7 +314,7 @@ describe('ReactNativeTracing', () => {
 
               const span = spanRecorder.spans[spanRecorder.spans.length - 1];
 
-              expect(span.op).toBe('app_start_cold');
+              expect(span.op).toBe('app.start.cold');
               expect(span.description).toBe('Cold App Start');
               expect(span.startTimestamp).toBe(appStartTimeMilliseconds / 1000);
               expect(span.endTimestamp).toBe(timeOriginMilliseconds / 1000);
@@ -368,7 +368,7 @@ describe('ReactNativeTracing', () => {
             jest.runOnlyPendingTimers();
 
             // @ts-ignore access private for test
-            expect(routeTransaction._measurements?.app_start_warm?.value).toBe(
+            expect(routeTransaction._measurements['app.start.warm'].value).toBe(
               timeOriginMilliseconds - appStartTimeMilliseconds
             );
 
@@ -384,7 +384,7 @@ describe('ReactNativeTracing', () => {
 
               const span = spanRecorder.spans[spanRecorder.spans.length - 1];
 
-              expect(span.op).toBe('app_start_warm');
+              expect(span.op).toBe('app.start.warm');
               expect(span.description).toBe('Warm App Start');
               expect(span.startTimestamp).toBe(appStartTimeMilliseconds / 1000);
               expect(span.endTimestamp).toBe(timeOriginMilliseconds / 1000);