diff --git a/stack9.8.yaml b/stack9.8.yaml
index 3fa3937ed..84e3d6aab 100644
--- a/stack9.8.yaml
+++ b/stack9.8.yaml
@@ -1,6 +1,6 @@
 # stack build plan using GHC 9.8.1
 
-resolver: nightly-2024-02-26
+resolver: nightly-2024-02-28
 
 packages:
 - hledger-lib
@@ -8,27 +8,20 @@ packages:
 - hledger-ui
 - hledger-web
 
+# XXX
 extra-deps:
-- base64-0.4.2.4
-- cassava-megaparsec-2.1.0
-- email-validate-2.3.2.19
-- hfsevents-0.1.7
-- yesod-1.6.2.1
-- yesod-form-1.7.6
-
-# work around https://github.com/stackbuilders/cassava-megaparsec/issues/39 etc.
-# both of these are needed:
-#allow-newer: true
-#allow-newer-deps:
-#- cassava-megaparsec
-#- email-validate
+- base64-0.4.2.4            # hledger-web does not yet support base64-1
+- cassava-megaparsec-2.1.1  # to support current bytestring/vector; not yet in stackage
+- email-validate-2.3.2.20   # to support 9.8's template-haskell; not yet in stackage
+- yesod-1.6.2.1             # not yet in stackage
+- yesod-form-1.7.6          # not yet in stackage
 
 nix:
   pure: false
   packages: [perl gmp ncurses zlib]
 
 ghc-options:
-  # silence 9.8's new partial warnings for now
+  # XXX silence 9.8's new partial warnings for now
   "$locals": -Wno-x-partial
 
 #   "$locals": -fplugin Debug.Breakpoint