diff --git a/hledger-lib/package.yaml b/hledger-lib/package.yaml
index be5e2495d..d8aa9b298 100644
--- a/hledger-lib/package.yaml
+++ b/hledger-lib/package.yaml
@@ -32,7 +32,7 @@ extra-source-files:
 #data-files:
 
 dependencies:
-- base >=4.14 && <4.17
+- base >=4.14 && <4.18
 - aeson >=1
 - aeson-pretty
 - ansi-terminal >=0.9
diff --git a/hledger-ui/package.yaml b/hledger-ui/package.yaml
index 69e3c9777..1f3599244 100644
--- a/hledger-ui/package.yaml
+++ b/hledger-ui/package.yaml
@@ -49,7 +49,7 @@ ghc-options:
 - -Wno-unused-do-bind
 
 dependencies:
-- base >=4.14 && <4.17
+- base >=4.14 && <4.18
 - hledger-lib >=1.27.99 && <1.28
 - hledger >=1.27.99 && <1.28
 - ansi-terminal >=0.9
diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index dfe40b3a1..192efaf55 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -78,7 +78,7 @@ when:
   ghc-options: -O0
 
 dependencies:
-- base >=4.14 && <4.17
+- base >=4.14 && <4.18
 - breakpoint
 
 library:
diff --git a/hledger/package.yaml b/hledger/package.yaml
index 38dae818e..b98b3eb6b 100644
--- a/hledger/package.yaml
+++ b/hledger/package.yaml
@@ -96,7 +96,7 @@ ghc-options:
 - -optP-Wno-nonportable-include-path
 
 dependencies:
-- base >=4.14 && <4.17
+- base >=4.14 && <4.18
 - hledger-lib >=1.27.99 && <1.28
 - aeson >=1
 - ansi-terminal >=0.9
diff --git a/stack9.4.yaml b/stack9.4.yaml
new file mode 100644
index 000000000..fc668945c
--- /dev/null
+++ b/stack9.4.yaml
@@ -0,0 +1,43 @@
+# stack build plan using GHC 9.4.3
+
+resolver: nightly-2022-11-26
+
+packages:
+- hledger-lib
+- hledger
+- hledger-ui
+- hledger-web
+
+extra-deps:
+# for hledger-lib:
+# for hledger:
+# for hledger-ui:
+# for hledger-web:
+- hjsmin-0.2.0.4
+- yesod-1.6.2.1
+- yesod-static-1.6.1.0
+# for Shake.hs:
+
+allow-newer: true
+
+nix:
+  pure: false
+  packages: [perl gmp ncurses zlib]
+
+ghc-options:
+  "$locals": -fplugin Debug.Breakpoint
+
+# # for precise profiling, per https://www.tweag.io/posts/2020-01-30-haskell-profiling.html:
+# # apply-ghc-options: everything
+# # rebuild-ghc-options: true
+# # stack build --profile --ghc-options="-fno-prof-auto"
+
+# # tell GHC to write hie files, eg for weeder. Rumoured to be slow.
+# # ghc-options:
+# #   "$locals": -fwrite-ide-info
+
+# # ghc-options:
+# #   "$locals": -ddump-timings
+# #  "$targets": -Werror
+# #  "$everything": -O2
+# #  some-package: -DSOME_CPP_FLAG