The Swiss National Bank raised its policy interest rate by 0.75 percentage point today - only the second rise in 15 years - and said it could not rule out more hikes as it joined other central banks in tightening monetary policy to curb inflation.
The Swiss National Bank increased its policy rate to 0.5% from the -0.25% level it set in June.
Previously Swiss rates had been frozen at -0.75% for years as the SNB tried to tame the appreciation of the safe-haven Swiss franc.
Most economists polled by Reuters had expected the SNB to raise its policy rate to 0.5%.
"It cannot be ruled out that further increases in the SNB policy rate will be necessary to ensure price stability over the medium term," SNB Chairman Thomas Jordan told a news conference.
The SNB is also ready to be active in foreign currency markets, he added. This meant the central bank would purchase foreign currencies to rein in an "excessive appreciation" of the Swiss franc, Jordan said.
"If the Swiss franc were to weaken, however, we would consider selling foreign currency," Jordan said.
Swiss government bond yields fell, reversing course following an initial spike, while the franc dropped broadly, falling against the dollar, euro and pound.
Jordan noted that the franc had risen by around 7% since the SNB's last rate hike in June, a development which had helped dampen inflation in Switzerland.
The SNB's decision to increase rates followed rising prices in Switzerland and hawkish moves by other central banks that are trying to keep a lid on resurgent inflation caused by spiralling energy costs, tight labour markets and supply chain bottlenecks.
The US Federal Reserve further increased its benchmark rate by 75 basis points last night, its third hike of that magnitude in a row.
The Bank of England is also expected to increase its rate by 50 basis points later today.
The European Central Bank this month also raised its deposit rate by 75 basis points and promised further hikes to combat spiralling inflation, which hit 9.1% in August driven by higher fuel and energy costs.
Although Swiss inflation remains modest in comparison, it reached a higher-than-expected 3.5% in August, the seventh month in a row that it has exceeded the SNB's target range of 0-2% and its highest level since August 1993.
Karsten Junius, an economist at J.Safra Sarasin, said the SNB's hike was accompanied by a more dovish message regarding further rises compared to the messages from other central banks.
"The SNB says that 'it cannot be ruled out that further increases of the SNB policy rate will be necessary' while all other central banks more or less announce ongoing tightening," he said.