diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 ## Unreleased
 
+## 0.1.2.2 — 2026-10-16
+
+### Changed
+
+- Require the compatible Shikumi patch releases built against Baikai 0.8.
+
+- Upgrade `mori://shinzui/baikai/packages/baikai` to `>=0.8.0.0 && <0.9`.
+
 ## 0.1.2.1 — 2026-10-05
 
 - Refresh internal package bounds and Haddock links; no public API change.
diff --git a/shikumi-trace-otel.cabal b/shikumi-trace-otel.cabal
--- a/shikumi-trace-otel.cabal
+++ b/shikumi-trace-otel.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.4
 name: shikumi-trace-otel
-version: 0.1.2.1
+version: 0.1.2.2
 synopsis:
   OpenTelemetry export of shikumi hierarchical trace trees (EP-7)
 
@@ -50,7 +50,7 @@
 
   build-depends:
     aeson >=2.2 && <2.3,
-    baikai >=0.7.1.0 && <0.8,
+    baikai >=0.8.0.0 && <0.9,
     base >=4.20 && <5,
     bytestring >=0.11 && <0.13,
     containers >=0.6 && <0.9,
@@ -61,8 +61,8 @@
     hs-opentelemetry-semantic-conventions >=1.40 && <2,
     lens ^>=5.3,
     scientific >=0.3 && <0.4,
-    shikumi ^>=0.4.0.0,
-    shikumi-trace ^>=0.3.0.1,
+    shikumi ^>=0.4.1.1,
+    shikumi-trace ^>=0.3.0.2,
     text ^>=2.1,
     time >=1.12 && <1.17,
     unordered-containers >=0.2 && <0.3,
@@ -89,12 +89,12 @@
     hs-opentelemetry-exporter-in-memory >=1.0 && <1.1,
     hs-opentelemetry-sdk >=1.0 && <1.1,
     lens,
-    shikumi ^>=0.4.0.0,
-    shikumi-cache ^>=0.2.0.1,
-    shikumi-eval ^>=0.3.0.1,
+    shikumi ^>=0.4.1.1,
+    shikumi-cache ^>=0.2.0.2,
+    shikumi-eval ^>=0.3.0.2,
     shikumi-testing ^>=0.1.0.0,
-    shikumi-trace ^>=0.3.0.1,
-    shikumi-trace-otel ^>=0.1.2.1,
+    shikumi-trace ^>=0.3.0.2,
+    shikumi-trace-otel ^>=0.1.2.2,
     tasty,
     tasty-hunit,
     text,