diff --git a/stack.yaml b/stack.yaml
new file mode 100644
index 000000000..15630fb85
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,39 @@
+# stack build plan using GHC 8.4.1 and recent stackage nightly
+
+resolver: nightly-2018-03-23
+
+packages:
+- hledger-lib
+- hledger
+- hledger-ui
+#- hledger-web  waiting for wai-handler-launch
+#- hledger-api  waiting for http-media
+
+extra-deps:
+# hledger
+- easytest-0.1
+- hashtables-1.2.3.0
+- uglymemo-0.1.0.1
+- wizards-1.0.2
+- control-monad-free-0.6.1
+- prelude-extras-0.4.0.3
+# hledger-ui
+- brick-0.35
+- fsnotify-0.2.1.1
+- text-zipper-0.10.1
+- config-ini-0.2.2.0
+- data-clist-0.1.2.1
+- word-wrap-0.4.1
+# hledger-web
+- json-0.9.2
+- wai-handler-launch-3.0.2.3
+# hledger-api
+# - servant-server-0.13
+# - servant-swagger-1.1.5
+# - swagger2-2.2.1
+# - http-media-0.7.1.2
+# - servant-0.13
+
+nix:
+  pure: false
+  packages: [perl gmp ncurses zlib]
diff --git a/stack8.4.yaml b/stack8.4.yaml
deleted file mode 100644
index 180a9d986..000000000
--- a/stack8.4.yaml
+++ /dev/null
@@ -1,131 +0,0 @@
-# stack build plan for testing with latest ghc 8.4-based stackage nightlies
-
-resolver: nightly-2018-03-16
-
-nix:
-  pure: false
-  packages: [perl gmp ncurses zlib]
-
-packages:
-- hledger-lib
-- hledger
-- hledger-ui
-- hledger-web
-- hledger-api
-
-extra-deps:
-- easytest-0.1
-- Decimal-0.5.1
-- blaze-markup-0.8.2.0
-- csv-0.1.2
-- extra-1.6.4
-- hashtables-1.2.2.1
-- megaparsec-6.4.1
-- mtl-2.2.2
-- parsec-3.1.13.0
-- text-1.2.3.0
-- uglymemo-0.1.0.1
-- blaze-builder-0.4.0.2
-- async-2.1.1.1
-- here-1.2.13
-- lucid-2.9.9
-- shakespeare-2.0.15
-- tabular-0.2.2.7
-- transformers-0.5.5.0
-- wizards-1.0.2
-- blaze-html-0.9.0.1
-- control-monad-free-0.6.1
-- haskell-src-meta-0.8.0.2
-- prelude-extras-0.4.0.3
-- timeit-2.0
-- brick-0.34.1
-- fsnotify-0.2.1.1
-- text-zipper-0.10.1
-- vty-5.20
-- config-ini-0.2.2.0
-- data-clist-0.1.2.0
-- word-wrap-0.4.1
-- QuickCheck-2.10.1
-- clientsession-0.9.1.2
-- conduit-extra-1.3.0
-- hjsmin-0.2.0.2
-- http-client-0.5.10
-- http-conduit-2.3.0
-- json-0.9.1
-- wai-3.2.1.1
-- wai-extra-3.0.22.0
-- wai-handler-launch-3.0.2.3
-- warp-3.2.18.1
-- yesod-1.6.0
-- yesod-core-1.6.2
-- yesod-form-1.6.1
-- yesod-static-1.6.0
-- auto-update-0.1.4
-- byteable-0.1.1
-- bytestring-builder-0.10.8.1.0
-- cipher-aes-0.2.11
-- cookie-0.4.4
-- cprng-aes-0.6.1
-- crypto-api-0.13.3
-- crypto-random-0.0.9
-- cryptonite-0.25
-- cryptonite-conduit-0.2.2
-- css-text-0.1.3.0
-- deepseq-generics-0.2.0.0
-- email-validate-2.3.2.3
-- entropy-0.4.1.1
-- fast-logger-2.4.11
-- http-client-tls-0.3.5.3
-- http-date-0.0.6.1
-- http2-1.6.3
-- language-javascript-0.6.0.10
-- memory-0.14.16
-- mime-types-0.1.0.7
-- monad-logger-0.3.28.2
-- path-pieces-0.2.1
-- persistent-2.8.1
-- simple-sendfile-0.2.27
-- skein-1.0.9.4
-- streaming-commons-0.2.0.0
-- stringsearch-0.3.6.6
-- vault-0.3.1.0
-- wai-app-static-3.1.6.1
-- wai-logger-2.3.2
-- xss-sanitize-0.3.5.7
-- yesod-persistent-1.6.0
-- connection-0.2.8
-- crypto-cipher-types-0.0.9
-- easy-file-0.2.1
-- http-api-data-0.3.8
-- persistent-template-2.5.4
-- psqueues-0.2.5.0
-- resource-pool-0.2.3.2
-- securemem-0.1.10
-- tls-1.4.1
-- unix-time-0.3.8
-- asn1-encoding-0.9.5
-- asn1-types-0.3.2
-- uri-bytestring-0.3.1.1
-- x509-1.7.3
-- x509-store-1.6.6
-- x509-system-1.6.6
-- x509-validation-1.6.10
-- asn1-parse-0.9.4
-- hourglass-0.2.11
-- pem-0.2.4
-- yesod-test-1.6.2
-- html-conduit-1.3.0
-- xml-conduit-1.8.0
-- tagstream-conduit-0.5.5.3
-- either-5
-- servant-server-0.13
-- servant-swagger-1.1.5
-- swagger2-2.2
-- Cabal-2.0.1.1
-- http-media-0.7.1.2
-- insert-ordered-containers-0.2.1.0
-- lens-4.16
-- servant-0.13
-- string-conversions-0.4.0.1
-- transformers-compat-0.5.1.4
-- natural-transformation-0.4