diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 ## Unreleased
 
+## 0.1.2.1 - 2026-07-20
+
+### Changed
+
+- Upgraded the test suite's `baikai` dependency to the `0.4` series
+  (`>=0.4 && <0.5`). Dependency bounds only — no changes to the exported API.
+
 ## 0.1.2.0 - 2026-07-05
 
 ### Changed
diff --git a/shikumi-cache-postgres.cabal b/shikumi-cache-postgres.cabal
--- a/shikumi-cache-postgres.cabal
+++ b/shikumi-cache-postgres.cabal
@@ -1,6 +1,6 @@
 cabal-version:   3.4
 name:            shikumi-cache-postgres
-version:         0.1.2.0
+version:         0.1.2.1
 synopsis:        Postgres-backed shikumi cache (EP-6)
 category:        AI
 description:
@@ -52,7 +52,7 @@
   main-is:        Main.hs
   ghc-options:    -threaded -with-rtsopts=-N
   build-depends:
-    , baikai                  >=0.3      && <0.4
+    , baikai                  >=0.4      && <0.5
     , base
     , effectful
     , ephemeral-pg