I am currently upgrading our chain to polkadot-v0.9.38 but when I run the build I get the following error:

error[E0405]: cannot find trait `Signature` in crate `signature`
   --> /home/albrayanov/.cargo/registry/src/github.com-1ecc6299db9ec823/ed25519-1.5.2/src/lib.rs:335:17
335 | impl signature::Signature for Signature {
    |                 ^^^^^^^^^ not found in `signature`

Any ideas on how to resolve this since the signature::Signature implementation is not defined in our code (link to the branch can be found here)?

1 Answer 1


Kindly use the command cargo update and Then let me know

  • 1
    Thanks seems to work after cargo update
    – chexware
    Commented May 22, 2023 at 19:24

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