pin your faith/hopes on somebody/something

pin (one's) hopes on (someone or something)

To have expectations that are tied to the success, performance, etc., of a particular person or thing. Why are we pinning our hopes on him when we know he's not popular enough to defeat the incumbent? I had pinned my hopes on this promotion, so I was crushed when I didn't get it.
See also: hope, on, pin
Farlex Dictionary of Idioms.

ˌpin your ˈfaith/ˈhopes on somebody/something

put your trust in somebody/something; hope for somebody/something: He’s pinning his faith on the revival of the economy. The idea that he’ll be out of prison in five years is all she’s got to pin her hopes on.
See also: faith, hope, on, pin, somebody, something
Farlex Partner Idioms Dictionary
See also:
  • pin (one's) hopes on (someone or something)
  • pin one's hopes on
  • pin (one's) faith on (someone or something)
  • pin faith on
  • a one-trick pony
  • a rotten apple spoils the (whole) barrel
  • a rotten apple spoils the (whole) bunch
  • a rotten apple spoils the (whole) bushel
  • bushel
  • one rotten apple spoils the (whole) barrel