The UK economy grew by 0.6% in the fourth quarter of 2015, according to the Office for National Statistics (ONS), up from initial estimates of 0.5%.
It means that growth for the whole year also edged up from 2.2% to 2.3%.
In separate figures from the ONS, the government current account deficit grew to a record high of £32.7 billion in the final three months of the year, representing 7% of GDP. For the year, the deficit widened to £96.2bn - 5.2% of GDP - another record figure.
The Chancellor George Osborne said the deficit figures add to reasons not to the leave the European Union.
He said: "Today's figures expose the real danger of economic uncertainty and show that now is precisely not the time to put our economic security at risk by leaving the EU."
Earlier this week, the Bank of England warned that a Brexit could spark another credit crunch, indicating the UK's financial stability could be jeopardised by the uncertainty of leaving the EU.