By Tony Romeo

HARRISBURG, Pa. (CBS) — The Pennsylvania Senate has approved its version of a new state budget amid words of caution from Governor Corbett.

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With the state’s revenue picture improving, the state senate’s budget plan would restore all of the governor’s proposed cuts to higher education and about half of his proposed cuts for county-run human services programs.

During floor debate, state senator Michael Stack (D-Phila.) said the senate budget was an improvement but not good enough.

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“This budget plan is certainly a step in the right direction. But it’s only a step. And I’m going to vote against this plan because I think we can do better,” he told colleagues.

But appearing this morning on WPHT Talk Radio with Dom Giordano, Governor Corbett said the senate plan is about as far as he could go.

“I take that to be the ceiling in the negotiations,” he said.

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The governor says he remains concerned that the improving economy could sputter again, and he wants to make sure any final budget will be “sustainable.”