diff --git a/biome.json b/biome.json
index 52f6d6728bf4..3960297b92d1 100644
--- a/biome.json
+++ b/biome.json
@@ -23,6 +23,9 @@
       },
       "nursery": {
         "noUnusedImports": "error"
+      },
+      "performance": {
+        "noAccumulatingSpread": "error"
       }
     },
     "ignore": [".vscode/*", "**/*.json"]
diff --git a/packages/integrations/scripts/buildBundles.ts b/packages/integrations/scripts/buildBundles.ts
index d056d5a523e2..b5eb77730d40 100644
--- a/packages/integrations/scripts/buildBundles.ts
+++ b/packages/integrations/scripts/buildBundles.ts
@@ -33,7 +33,10 @@ async function buildBundle(integration: string, jsVersion: string): Promise<void
 if (runParallel) {
   // We're building a bundle for each integration and each JavaScript version.
   const tasks = getIntegrations().reduce(
-    (tasks, integration) => [...tasks, buildBundle(integration, 'es5'), buildBundle(integration, 'es6')],
+    (tasks, integration) => {
+      tasks.push(buildBundle(integration, 'es5'), buildBundle(integration, 'es6'));
+      return tasks;
+    },
     [] as Promise<void>[],
   );
 
diff --git a/packages/utils/src/baggage.ts b/packages/utils/src/baggage.ts
index 0202f0ec00f5..25210d02bbc4 100644
--- a/packages/utils/src/baggage.ts
+++ b/packages/utils/src/baggage.ts
@@ -40,10 +40,10 @@ export function baggageHeaderToDynamicSamplingContext(
     // Combine all baggage headers into one object containing the baggage values so we can later read the Sentry-DSC-values from it
     baggageObject = baggageHeader.reduce<Record<string, string>>((acc, curr) => {
       const currBaggageObject = baggageHeaderToObject(curr);
-      return {
-        ...acc,
-        ...currBaggageObject,
-      };
+      for (const key of Object.keys(currBaggageObject)) {
+        acc[key] = currBaggageObject[key];
+      }
+      return acc;
     }, {});
   } else {
     // Return undefined if baggage header is an empty string (technically an empty baggage header is not spec conform but
diff --git a/scripts/prepack.ts b/scripts/prepack.ts
index 65cd9ddbf631..43febdcde4ee 100644
--- a/scripts/prepack.ts
+++ b/scripts/prepack.ts
@@ -95,13 +95,14 @@ if (newPkgJson[EXPORT_MAP_ENTRY_POINT]) {
 
 if (newPkgJson[TYPES_VERSIONS_ENTRY_POINT]) {
   Object.entries(newPkgJson[TYPES_VERSIONS_ENTRY_POINT]).forEach(([key, val]) => {
-    newPkgJson[TYPES_VERSIONS_ENTRY_POINT][key] = Object.entries(val).reduce((acc, [key, val]) => {
-      const newKey = key.replace(`${buildDir}/`, '');
-      return {
-        ...acc,
-        [newKey]: val.map(v => v.replace(`${buildDir}/`, '')),
-      };
-    }, {});
+    newPkgJson[TYPES_VERSIONS_ENTRY_POINT][key] = Object.entries(val).reduce(
+      (acc, [key, val]) => {
+        const newKey = key.replace(`${buildDir}/`, '');
+        acc[newKey] = val.map(v => v.replace(`${buildDir}/`, ''));
+        return acc;
+      },
+      {} as Record<string, string[]>,
+    );
   });
 }