diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 ## Unreleased
 
+## 0.3.0.1 - 2026-07-20
+
+### Changed
+
+- Upgraded the `baikai` dependency to the `0.4` series (`>=0.4 && <0.5`).
+  Dependency bounds only — no changes to the exported API.
+
 ## 0.3.0.0 - 2026-07-05
 
 ### Added
diff --git a/shikumi-tools.cabal b/shikumi-tools.cabal
--- a/shikumi-tools.cabal
+++ b/shikumi-tools.cabal
@@ -1,6 +1,6 @@
 cabal-version:   3.4
 name:            shikumi-tools
-version:         0.3.0.0
+version:         0.3.0.1
 synopsis:
   Typed tools and ReAct agents for shikumi LM programs (EP-11)
 
@@ -58,7 +58,7 @@
 
   build-depends:
     , aeson
-    , baikai           >=0.3      && <0.4
+    , baikai           >=0.4      && <0.5
     , base             >=4.20     && <5
     , bytestring
     , containers
@@ -102,7 +102,7 @@
 
   build-depends:
     , aeson
-    , baikai         >=0.3      && <0.4
+    , baikai         >=0.4      && <0.5
     , base
     , bytestring
     , containers