Upstream has released hledger 1.17 https://hledger.org/release-notes.html
Also, I saw that hledger 1.14 has been removed from Debian testing due to FTBS issues on s390x https://tracker.debian.org/news/1099686/haskell-hledger-removed-from-testing/ I'm not a Haskell programmer, but since hledger 1.16 added support for GHC 8.8, and since Debian testing and unstable are both on GHC 8.8.1, upgrading the hledger packages to 1.16 or 1.17 might help resolve the FTBS issues that caused hledger to be removed from Debian testing.
