The reference rate went up by 100 basis points to 4.5 percent, from 3.5 percent, amid rising inflation, which hit 10.9 percent in March, state news agency PAP reported.
The Polish central bank last month predicted that inflation in the country would stand at 10.8 percent in 2022 on average, followed by 9 percent in 2023 and 4.2 percent in 2024.
Poland's government last month announced a raft of new measures to mitigate the impact of Russia’s invasion of Ukraine on the Polish economy and society.
Central bank chief Adam Glapiński earlier this year vowed to do all it takes to ensure a lasting reduction in inflation.
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Source: PAP