diff --git a/stack.yaml b/stack.yaml
index 795a11b7a..42de3c427 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,7 +1,8 @@
-# stack build plan using GHC 9.12.2
+# stack build plan using GHC 9.12.3
 # 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
 # https://downloads.haskell.org/ghc/9.12.2/docs/users_guide/9.12.2-notes.html
+# https://downloads.haskell.org/ghc/9.12.2/docs/users_guide/9.12.3-notes.html
 
 packages:
 - hledger-lib
@@ -9,7 +10,7 @@ packages:
 - hledger-ui
 - hledger-web
 
-resolver: nightly-2025-09-30
+resolver: nightly-2026-01-08
 
 notify-if-ghc-untested:   false
 notify-if-cabal-untested: false
diff --git a/stack914.yaml b/stack914.yaml
index 970b3c833..545a5560a 100644
--- a/stack914.yaml
+++ b/stack914.yaml
@@ -1,7 +1,7 @@
 # stack build plan using GHC 9.14 installed in PATH
 # https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.14
 
-resolver: nightly-2025-10-11
+resolver: nightly-2026-01-08
 compiler: ghc-9.14
 notify-if-ghc-untested:   false
 notify-if-cabal-untested: false