diff --git a/stack.yaml b/stack.yaml
index 453e973c5..8dc37e793 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -31,6 +31,7 @@ extra-deps:
 # Workaround for https://github.com/commercialhaskell/stack/issues/3922:
 - haskell-src-exts-1.21.0
 
-# Workaround for https://github.com/simonmichael/hledger/issues/1039 (hledger-web on Windows 7):
-- github: kazu-yamamoto/unix-time
-  commit: cdfda676dcc1ee84b3de5dca4a48945f2d6b6e10
+# Workaround for https://github.com/simonmichael/hledger/issues/1039
+# (hledger-web build failure with GHC 8.6 on Windows 7)
+# Might also be fixed by using GHC 8.6.5+, mixed reports
+- unix-time-0.4.6