diff --git a/tests/e2e/crud/crud_test.go b/tests/e2e/crud/crud_test.go
index 97e3428e08..196eda5f6e 100644
--- a/tests/e2e/crud/crud_test.go
+++ b/tests/e2e/crud/crud_test.go
@@ -420,6 +420,8 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 			Train: ds.Train[updateFrom : updateFrom+updateNum],
 		},
 		true,
+		0,
+		false,
 		1,
 		func(t *testing.T, status int32, msg string) error {
 			t.Helper()
@@ -455,6 +457,8 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 			Train: ds.Train[updateFrom : updateFrom+updateNum],
 		},
 		false,
+		0,
+		false,
 		1,
 		func(t *testing.T, status int32, msg string) error {
 			t.Helper()
@@ -507,6 +511,8 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 			Train: ds.Train[updateFrom : updateFrom+updateNum],
 		},
 		false,
+		0,
+		false,
 		1,
 		operation.DefaultStatusValidator,
 		operation.ParseAndLogError,
@@ -523,6 +529,8 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 			Train: ds.Train[updateFrom : updateFrom+updateNum],
 		},
 		false,
+		0,
+		false,
 		1,
 		func(t *testing.T, status int32, msg string) error {
 			t.Helper()
@@ -560,6 +568,28 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 			Train: ds.Train[updateFrom : updateFrom+updateNum],
 		},
 		true,
+		0,
+		false,
+		1,
+		operation.DefaultStatusValidator,
+		operation.ParseAndLogError,
+	)
+	if err != nil {
+		t.Fatalf("an error occurred on #6: %s", err)
+	}
+
+	ts := time.Now().UnixNano()
+
+	// #7 run Update with the same vector as UpdateTimestampIfExists=true and check that it succeeds
+	err = op.UpdateWithParameters(
+		t,
+		ctx,
+		operation.Dataset{
+			Train: ds.Train[updateFrom : updateFrom+updateNum],
+		},
+		false,
+		ts,
+		true,
 		1,
 		operation.DefaultStatusValidator,
 		operation.ParseAndLogError,
@@ -568,7 +598,7 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 		t.Fatalf("an error occurred on #6: %s", err)
 	}
 
-	// #7 remove the vector in 6 with SkipStrictExistCheck=false and check that it succeeds
+	// #8 remove the vector in 6 with SkipStrictExistCheck=false and check that it succeeds
 	err = op.RemoveWithParameters(
 		t,
 		ctx,
@@ -583,7 +613,7 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 		t.Fatalf("an error occurred on #7: %s", err)
 	}
 
-	// #8 removed the vector of 6 with SkipStrictExistCheck=false and confirmed that it became NotFound
+	// #9 removed the vector of 6 with SkipStrictExistCheck=false and confirmed that it became NotFound
 	err = op.RemoveWithParameters(
 		t,
 		ctx,
@@ -619,7 +649,7 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 		t.Fatalf("an error occurred: %s", err)
 	}
 
-	// #9 remove vector 6 with SkipStrictExistCheck=true and check that it also becomes NotFound
+	// #10 remove vector 6 with SkipStrictExistCheck=true and check that it also becomes NotFound
 	err = op.RemoveWithParameters(
 		t,
 		ctx,
@@ -653,7 +683,7 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 		t.Fatalf("an error occurred: %s", err)
 	}
 
-	// #10 execute Upsert with SkipStrictExistCheck=false and check that it succeeds
+	// #11 execute Upsert with SkipStrictExistCheck=false and check that it succeeds
 	err = op.UpsertWithParameters(
 		t,
 		ctx,
@@ -669,7 +699,7 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 		t.Fatalf("an error occurred on #10: %s", err)
 	}
 
-	// #11 executed Upsert with SkipStrictExistCheck=false using the same vector as 10 and confirmed that AlreadyExists was returned
+	// #12 executed Upsert with SkipStrictExistCheck=false using the same vector as 10 and confirmed that AlreadyExists was returned
 	err = op.UpsertWithParameters(
 		t,
 		ctx,
@@ -706,7 +736,7 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 		t.Fatalf("an error occurred: %s", err)
 	}
 
-	// #12 executed SkipStrictExistCheck=false using a different vector than 10 for Upsert and confirmed that it succeeded
+	// #13 executed SkipStrictExistCheck=false using a different vector than 10 for Upsert and confirmed that it succeeded
 	err = op.UpsertWithParameters(
 		t,
 		ctx,
@@ -722,7 +752,7 @@ func TestE2ECRUDWithSkipStrictExistCheck(t *testing.T) {
 		t.Fatalf("an error occurred on #12: %s", err)
 	}
 
-	// #13 executed SkipStrictExistCheck=true using the same vector as Upsert 12 and confirmed that it succeeded
+	// #14 executed SkipStrictExistCheck=true using the same vector as Upsert 12 and confirmed that it succeeded
 	err = op.UpsertWithParameters(
 		t,
 		ctx,
diff --git a/tests/e2e/operation/stream.go b/tests/e2e/operation/stream.go
index 585039dc2b..2f65ce0a2a 100644
--- a/tests/e2e/operation/stream.go
+++ b/tests/e2e/operation/stream.go
@@ -722,6 +722,8 @@ func (c *client) Update(t *testing.T, ctx context.Context, ds Dataset) error {
 		ctx,
 		ds,
 		false,
+		0,
+		false,
 		1,
 		DefaultStatusValidator,
 		ParseAndLogError,
@@ -733,6 +735,8 @@ func (c *client) UpdateWithParameters(
 	ctx context.Context,
 	ds Dataset,
 	skipStrictExistCheck bool,
+	ts int64,
+	updateTs bool,
 	offset int,
 	svalidator StatusValidator,
 	evalidator ErrorValidator,
@@ -804,7 +808,9 @@ func (c *client) UpdateWithParameters(
 				Vector: append(v[offset:], v[:offset]...),
 			},
 			Config: &payload.Update_Config{
-				SkipStrictExistCheck: skipStrictExistCheck,
+				SkipStrictExistCheck:    skipStrictExistCheck,
+				Timestamp:               ts,
+				UpdateTimestampIfExists: updateTs,
 			},
 		})
 		if err != nil {