diff --git a/packages/client-sdk-nodejs/src/internal/cache-data-client.ts b/packages/client-sdk-nodejs/src/internal/cache-data-client.ts
index ffadf296d..82d8edb1e 100644
--- a/packages/client-sdk-nodejs/src/internal/cache-data-client.ts
+++ b/packages/client-sdk-nodejs/src/internal/cache-data-client.ts
@@ -4541,6 +4541,8 @@ export class CacheDataClient implements IDataClient {
         (err, resp) => {
           if (resp?.missing) {
             resolve(new CacheIncreaseTtl.Miss());
+          } else if (resp?.not_set) {
+            resolve(new CacheIncreaseTtl.NotSet());
           } else if (resp?.set) {
             resolve(new CacheIncreaseTtl.Set());
           } else {
@@ -4600,6 +4602,8 @@ export class CacheDataClient implements IDataClient {
         (err, resp) => {
           if (resp?.missing) {
             resolve(new CacheDecreaseTtl.Miss());
+          } else if (resp?.not_set) {
+            resolve(new CacheDecreaseTtl.NotSet());
           } else if (resp?.set) {
             resolve(new CacheDecreaseTtl.Set());
           } else {
diff --git a/packages/client-sdk-web/src/internal/cache-data-client.ts b/packages/client-sdk-web/src/internal/cache-data-client.ts
index 69e287415..6e73fb4d9 100644
--- a/packages/client-sdk-web/src/internal/cache-data-client.ts
+++ b/packages/client-sdk-web/src/internal/cache-data-client.ts
@@ -4422,6 +4422,8 @@ export class CacheDataClient<
         (err, resp) => {
           if (resp?.getMissing()) {
             resolve(new CacheIncreaseTtl.Miss());
+          } else if (resp?.getNotSet()) {
+            resolve(new CacheIncreaseTtl.NotSet());
           } else if (resp?.getSet()) {
             resolve(new CacheIncreaseTtl.Set());
           } else {
@@ -4489,6 +4491,8 @@ export class CacheDataClient<
         (err, resp) => {
           if (resp?.getMissing()) {
             resolve(new CacheDecreaseTtl.Miss());
+          } else if (resp?.getNotSet()) {
+            resolve(new CacheDecreaseTtl.NotSet());
           } else if (resp?.getSet()) {
             resolve(new CacheDecreaseTtl.Set());
           } else {
diff --git a/packages/common-integration-tests/src/cache/update-ttl.ts b/packages/common-integration-tests/src/cache/update-ttl.ts
index 899fd29e6..8f3ce63a7 100644
--- a/packages/common-integration-tests/src/cache/update-ttl.ts
+++ b/packages/common-integration-tests/src/cache/update-ttl.ts
@@ -142,7 +142,7 @@ export function runUpdateTtlTest(
       expect(ttlResult.remainingTtlMillis()).toBeGreaterThan(15000);
     });
 
-    it('should Error if given TTL is less than current TTL', async () => {
+    it('should NotSet for increaseTTL if given TTL is less than current TTL', async () => {
       const cacheKey = v4();
       await cacheClient.set(integrationTestCacheName, cacheKey, cacheKey, {
         ttl: 10,
@@ -154,8 +154,8 @@ export function runUpdateTtlTest(
         5000
       );
       expectWithMessage(() => {
-        expect(response).toBeInstanceOf(CacheIncreaseTtl.Error);
-      }, `expected ERROR but got ${response.toString()}`);
+        expect(response).toBeInstanceOf(CacheIncreaseTtl.NotSet);
+      }, `expected NOT_SET but got ${response.toString()}`);
     });
 
     it('should Error if given a TTL below 0', async () => {
@@ -241,7 +241,7 @@ export function runUpdateTtlTest(
       expect(ttlResult.remainingTtlMillis()).toBeGreaterThan(0);
     });
 
-    it('should Error if given TTL is greater than current TTL', async () => {
+    it('should NotSet for decreaseTTL if given TTL is greater than current TTL', async () => {
       const cacheKey = v4();
       await cacheClient.set(integrationTestCacheName, cacheKey, cacheKey, {
         ttl: 10,
@@ -253,8 +253,8 @@ export function runUpdateTtlTest(
         20000
       );
       expectWithMessage(() => {
-        expect(response).toBeInstanceOf(CacheDecreaseTtl.Error);
-      }, `expected ERROR but got ${response.toString()}`);
+        expect(response).toBeInstanceOf(CacheDecreaseTtl.NotSet);
+      }, `expected NOT_SET but got ${response.toString()}`);
     });
 
     it('should Error if given a TTL below 0', async () => {