diff --git a/hledger-lib/package.yaml b/hledger-lib/package.yaml
index d880e8c96..dc4991fe6 100644
--- a/hledger-lib/package.yaml
+++ b/hledger-lib/package.yaml
@@ -46,7 +46,7 @@ flags:
 #    manual:  true
 
 dependencies:
-- base >=4.14 && <4.21
+- base >=4.14 && <4.22
 - aeson >=1 && <2.3
 - aeson-pretty
 - ansi-terminal >=0.9
diff --git a/hledger-ui/package.yaml b/hledger-ui/package.yaml
index 0d487e05f..325f0b338 100644
--- a/hledger-ui/package.yaml
+++ b/hledger-ui/package.yaml
@@ -75,7 +75,7 @@ when:
 #   - ghc-debug-stub >=0.6.0.0 && <0.7
 
 dependencies:
-- base >=4.14 && <4.21
+- base >=4.14 && <4.22
 
 library:
   source-dirs: .
@@ -126,7 +126,6 @@ executables:
     source-dirs: app
     main: hledger-ui.hs
     dependencies:
-    - base >=4.14 && <4.21
     - hledger-ui
     ghc-options: -with-rtsopts=-T  # for stats command
     when:
diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index 15c2ed240..b6eef4659 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -93,7 +93,7 @@ when:
 #   - ghc-debug-stub >=0.6.0.0 && <0.7
 
 dependencies:
-- base >=4.14 && <4.21
+- base >=4.14 && <4.22
 
 library:
   source-dirs: .
diff --git a/hledger/package.yaml b/hledger/package.yaml
index ec8b350ef..f03a66b88 100644
--- a/hledger/package.yaml
+++ b/hledger/package.yaml
@@ -122,7 +122,7 @@ when:
 #   - ghc-debug-stub >=0.6.0.0 && <0.7
 
 dependencies:
-- base >=4.14 && <4.21
+- base >=4.14 && <4.22
 - hledger-lib >=1.42.99 && <1.43
 - aeson >=1 && <2.3
 - ansi-terminal >=0.9
diff --git a/stack912.yaml b/stack912.yaml
index da9838e4e..a670c5e0b 100644
--- a/stack912.yaml
+++ b/stack912.yaml
@@ -1,40 +1,18 @@
-# draft stack build plan using GHC 9.12.2
+# stack build plan using GHC 9.12.2
 # https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.12
 # https://downloads.haskell.org/ghc/9.12.1/docs/users_guide/9.12.1-notes.html
-
-resolver: nightly-2025-04-01
-compiler: ghc-9.12.2
-notify-if-ghc-untested: false
-notify-if-cabal-untested: false
+# https://downloads.haskell.org/ghc/9.12.2/docs/users_guide/9.12.2-notes.html
 
 packages:
 - hledger-lib
-# - hledger
-# - hledger-ui
-# - hledger-web
+- hledger
+- hledger-ui
+- hledger-web
 
-# To minimise problems, use the versions shipped with GHC 9.10.1 when possible.
-# See https://github.com/haskell/unix/issues/329.
-extra-deps:
-
- # for hledger-lib
-# - Cabal-3.12.0.0
-# - Cabal-syntax-3.12.0.0
-# #- directory-1.3.8.3
-# #- filepath-1.5.2.0
-# - directory-1.3.9.0
-# - filepath-1.4.301.0
-# - ghc-boot-9.10.1@rev:1
-# - process-1.6.19.0
-# - time-1.12.2
-# - unix-2.8.5.1
-# # for windows
-# - Win32-2.14.0.0
-
-# # for hledger
-# - haskeline-0.8.2.1
-# # to silence a warning
-# - wizards-1.0.3@rev:3
+resolver: nightly-2025-04-01
+compiler: ghc-9.12.2
+notify-if-ghc-untested:   false
+notify-if-cabal-untested: false
 
 nix:
   pure: false