Leaving aside the important question of whether you should even be dragging more than S$125K along in low yielding vehicles, here are some other suggestions in no particular order:
1. Fixed deposits
Example (a): CIMB at 1.8% p.a. for 12 months, min. $10K
Example (b): ICBC at 1.75% p.a. for 3 months, min. $20K
2. Singapore Savings Bonds
This month's offer is 1.52% p.a. during the first year and 1.76% p.a. if held to maturity, min. $500 placement (plus a $2 transaction fee). Total SSB holdings are limited to S$200K per individual.
3. 6 month Singapore government T-bills
The next T-bill auction is next week (December 12), with applications closing early next week. It'll probably yield about 1.66% p.a. unless market rates change much between now and the auction. Min. $1,000 (face value), or you can park up into the millions of dollars here if you wish. There's effectively no limit with noncompetitive bids, and noncompetitive bids are the only bids individuals should lodge in these auctions.