The central bank also decided to raise the interest rate on savings by 25 basis points to 6.25 percent.
Inflation in the North African country hit a record 9.1 percent in September from 8.6 percent in August.
The last increase in the key interest rate was 75 basis points and approved by the central bank in May.
Tunisia, which is struggling to tackle badly damaged public finances, is seeking a loan from the International Monetary Fund in return for unpopular reforms that include spending cuts and cuts in energy and food subsidies.
The International Monetary Fund also called for more monetary tightening to tackle record inflation levels in Tunisia.
The bank said in a statement that foreign exchange reserves amounted to 23.848 billion dinars (about 7.34 billion dollars), equivalent to 112 days of imports on September 28, compared to 23.313 billion dinars or 133 days of imports at the end of 2021.
The bank added that the current account deficit amounted to -10.1 percent of GDP during the first eight months of 2022, compared to -6.6 percent in 2021.
He expected the continuation of inflationary pressures, driven by internal and external factors, in the coming period of this year.
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