diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 33b969109790..77716828865f 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1142,6 +1142,8 @@ self: super: {
   # https://bitbucket.org/rvlm/hakyll-contrib-hyphenation/src/master/
   # Therefore we jailbreak it.
   hakyll-contrib-hyphenation = doJailbreak super.hakyll-contrib-hyphenation;
+  # 2021-10-04: too strict upper bound on Hakyll
+  hakyll-filestore = doJailbreak super.hakyll-filestore;
 
   # 2020-06-22: NOTE: > 0.4.0 => rm Jailbreak: https://github.com/serokell/nixfmt/issues/71
   nixfmt = doJailbreak super.nixfmt;