error: ‘make_unique’ is not a member of ‘std’

[Anonymous3-a]

I was compiling this, and it said

/home/ilikecats/src/CpuVoxelRaycaster/lib/swarm/swarm.hpp: In member function ‘swrm::WorkGroup swrm::Swarm::execute(swrm::WorkerFunction, uint32_t)’:
/home/ilikecats/src/CpuVoxelRaycaster/lib/swarm/swarm.hpp:225:39: error: ‘make_unique’ is not a member of ‘std’
  225 |                 return WorkGroup(std::make_unique<ExecutionGroup>(job, group_size, m_available_workers));
      |                                       ^~~~~~~~~~~
/home/ilikecats/src/CpuVoxelRaycaster/lib/swarm/swarm.hpp:225:39: note: ‘std::make_unique’ is only available from C++14 onwards

I tried adding set(CMAKE_CXX_STANDARD 17) to CMakeLists.txt but it didn't work.
How can I fix it?