0445 GMT July 12, 2020
In a televised address before the weeklong ballot ends on Wednesday, Putin said Russians should vote for the country "we want to pass on to our children," AFP reported.
The president made no mention of an amendment that would allow him to potentially stay in power until 2036.
Russians began voting last week on the package of constitutional changes proposed by Putin earlier this year, including a reset of presidential term limits that would allow him to run twice again after his current six-year term ends in 2024.
Other amendments would strengthen presidential and parliamentary powers, enshrine traditional values and guarantee better minimum wages and pensions.
"We are voting for the country in which we want to live, with modern education and health care, with reliable social protection of citizens, with an effective government that is accountable to society," Putin said.
"We are voting for the country... we want to pass on to our children and grandchildren."
Parliament has already approved the amendments but Putin reiterated they would only take effect if supported by a majority of voters.
"We can ensure stability, security, prosperity and a decent life only through development, only together and by ourselves," he said.