I published a contract to my localnet using:

cleos set contract myaccount mycontractfolder -p myaccount

Then I made some updates to the code, and want to publish them, I type the same command again, but this time, I get the error message:

Error 3160008: Contract is already running this version of code
Error Details:
contract is already running this version of code
pending console output:

How can I publish the contract updates without restarting nodeos?

  • 1
    did you recompile? your command looks correct but you need to recompile after modifications
    – confused00
    Jul 24, 2018 at 8:05
  • Yes I recompiled. Jul 24, 2018 at 8:27
  • 1
    could it be that the change didn't update the wasm as it got optimised out? maybe you could try introducing a new function or a print function
    – confused00
    Jul 24, 2018 at 8:34
  • 1
    You are right! The wasm code was not updated because the change was optimized out. If you write an answer I'll accept it. Jul 24, 2018 at 11:14

3 Answers 3


Certain small code changes get optimised out by the WASM compiler, resulting in an identical .wasm file, so nodeos may reject the update.

Try making a more significant code update such as introducing a new function or calling eosio::print(), and you can see if it works.


You should write or edit new code in it, and recompile it.

try below:

eosiocpp -g path/to/mycontractfolder.abi path/to/mycontractfolder.cpp
eosiocpp -o path/to/mycontractfolder.wast path/to/mycontractfolder.cpp

If you're using docker, you should send your contract to container via docker cp.

  • You wrote this answer after the comments on the question explained already that he did recompile the code. Read the comments on a question as well before writing an answer, to make sure you get all the details. Jul 24, 2018 at 14:58
  • @AndresBerrios Thanks. I'll check the comments next time.
    – CHANN
    Jul 25, 2018 at 0:11

@confused00 is right in that you need to make significant changes because of wasm optimazation. I want to add that don't forget to update the EOSIO_ABI macro at the bottom of the contract. Too many times I have forgotten this and wondered why it wasn't updating.

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