Google updated its Android version tracker on Tuesday, revealing the latest version of its Android operating system is slowly gaining ground. The estimated number of devices running Ice Cream Sandwich has increased by more than two-thirds over the last month, from 2.9% of all Android devices to 4.9% as measured during the 14-day period ending on May 1st. The bulk of Android devices continue to run the year-and-a-half old Gingerbread operating system (64.4%), followed by the two-year old Froyo OS (20.9%). The adoption rate of Android 2.3 is still growing, however devices running Froyo decreased by almost 3%. As more and more manufacturers update their mobile portfolios and as the HTC One X, the HTC One S and the Samsung Galaxy S3 hit the market with Ice Cream Sandwich, the operating system is likely to see continued growth over the coming months. Google is likely to unveil its next major Android build some time this summer or in the third quarter of 2012, however, further complicating the spread of Android operating system versions currently in use.