diff --git a/src/__tests__/extensions/replay/config.test.ts b/src/__tests__/extensions/replay/config.test.ts
index 4892c6356..77ced9b8e 100644
--- a/src/__tests__/extensions/replay/config.test.ts
+++ b/src/__tests__/extensions/replay/config.test.ts
@@ -75,6 +75,20 @@ describe('config', () => {
                     'content-type': 'edited',
                 })
             })
+
+            it('case insensitively removes headers on the deny list', () => {
+                const networkOptions = buildNetworkRequestOptions(defaultConfig(), {})
+                const cleaned = networkOptions.maskRequestFn!({
+                    url: 'something',
+                    requestHeaders: {
+                        AuThOrIzAtIoN: 'Bearer 123',
+                        'content-type': 'application/json',
+                    },
+                })
+                expect(cleaned?.requestHeaders).toEqual({
+                    'content-type': 'application/json',
+                })
+            })
         })
     })
 })
diff --git a/src/extensions/replay/config.ts b/src/extensions/replay/config.ts
index 513db7fd6..d0e573130 100644
--- a/src/extensions/replay/config.ts
+++ b/src/extensions/replay/config.ts
@@ -32,23 +32,25 @@ export const defaultNetworkOptions: NetworkRecordOptions = {
 }
 
 const HEADER_DENYLIST = [
-    'Authorization',
-    'X-FORWARDED-FOR',
-    'AUTHORIZATION',
-    'COOKIE',
-    'SET-COOKIE',
-    'X-API-KEY',
-    'X-REAL-IP',
-    'REMOTE-ADDR',
-    'FORWARDED',
-    'PROXY-AUTHORIZATION',
-    'X-CSRF-TOKEN',
-    'X-CSRFTOKEN',
-    'X-XSRF-TOKEN',
+    'authorization',
+    'x-forwarded-for',
+    'authorization',
+    'cookie',
+    'set-cookie',
+    'x-api-key',
+    'x-real-ip',
+    'remote-addr',
+    'forwarded',
+    'proxy-authorization',
+    'x-csrf-token',
+    'x-csrftoken',
+    'x-xsrf-token',
 ]
 
 const removeAuthorizationHeader = (data: NetworkRequest): NetworkRequest => {
-    HEADER_DENYLIST.forEach((header) => delete data.requestHeaders?.[header])
+    Object.keys(data.requestHeaders ?? {}).forEach((header) => {
+        if (HEADER_DENYLIST.includes(header.toLowerCase())) delete data.requestHeaders?.[header]
+    })
     return data
 }