If you are correcting only a few small and obvious typos, it may be considered acceptable these days to do so silently.

For example, if you follow the The Chicago Manual of Style (17th ed.), the following is from section 13.7:

Although in a direct quotation the wording should be reproduced exactly, the following changes are generally permissible to make a passage fit into the syntax and typography of the surrounding text . . .

 

6. Obvious typographic errors may be corrected silently (without comment or sic), unless the passage quoted is from an older work or a manuscript or other unpublished source where idiosyncrasies of spelling are generally preserved. If spelling and punctuation are modernized or altered for clarity, readers must be so informed in a note, in a preface, or elsewhere.

(Several other points were made, but I elided them for the sake of brevity.)

Of course, if you're writing a thesis, I would check with your instructor or advisor to see what style guide should be followed.

If you are correcting only a few small and obvious typos, it may be considered acceptable these days to do so silently.

For example, if you follow the The Chicago Manual of Style (17th ed.), the following is from section 13.7:

Although in a direct quotation the wording should be reproduced exactly, the following changes are generally permissible to make a passage fit into the syntax and typography of the surrounding text . . .

6. Obvious typographic errors may be corrected silently (without comment or sic), unless the passage quoted is from an older work or a manuscript or other unpublished source where idiosyncrasies of spelling are generally preserved. If spelling and punctuation are modernized or altered for clarity, readers must be so informed in a note, in a preface, or elsewhere.

(Several other points were made, but I elided them for the sake of brevity.)

Of course, if you're writing a thesis, I would check with your instructor or advisor to see what style guide should be followed.