diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,14 @@
 
 ## [Unreleased]
 
+## 0.19.0.1 — 2026-10-05
+
+### Other Changes
+
+- Admit effectful 2.7 alongside 2.6: `effectful <2.8` and
+  `effectful-core >=2.6 && <2.7 || >=2.7.1.1 && <2.8`. Exclude the
+  effectful-core 2.7.0.0–2.7.1.0 performance regression. Bounds only; no source changed.
+
 ## 0.19.0.0 — 2026-09-25
 
 ### Other Changes
diff --git a/keiro-ops.cabal b/keiro-ops.cabal
--- a/keiro-ops.cabal
+++ b/keiro-ops.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: keiro-ops
-version: 0.19.0.0
+version: 0.19.0.1
 synopsis: Operational command-line interface for Keiro deployments
 description:
   A standalone database-only console and embeddable command tree for inspecting
@@ -70,12 +70,12 @@
     base >=4.21 && <5,
     bytestring >=0.12 && <0.13,
     containers >=0.6 && <0.8,
-    effectful >=2.6 && <2.7,
-    effectful-core >=2.6 && <2.7,
+    effectful >=2.6 && <2.8,
+    effectful-core >=2.6 && <2.7 || >=2.7.1.1 && <2.8,
     hasql >=1.10 && <1.11,
-    keiro ^>=0.19.0.0,
-    keiro-migrations ^>=0.19.0.0,
-    keiro-pgmq ^>=0.19.0.0,
+    keiro ^>=0.19.0.1,
+    keiro-migrations ^>=0.19.0.1,
+    keiro-pgmq ^>=0.19.0.1,
     kiroku-store >=0.9.0.1 && <0.10,
     optparse-applicative >=0.18 && <0.20,
     text >=2.1 && <2.2,
@@ -112,15 +112,15 @@
     base >=4.21 && <5,
     bytestring >=0.12 && <0.13,
     containers >=0.6 && <0.8,
-    effectful >=2.6 && <2.7,
-    effectful-core >=2.6 && <2.7,
+    effectful >=2.6 && <2.8,
+    effectful-core >=2.6 && <2.7 || >=2.7.1.1 && <2.8,
     hasql >=1.10 && <1.11,
     hasql-transaction >=1.1 && <1.3,
     hspec >=2.11,
-    keiro ^>=0.19.0.0,
+    keiro ^>=0.19.0.1,
     keiro-ops,
-    keiro-pgmq ^>=0.19.0.0,
-    keiro-test-support ^>=0.19.0.0,
+    keiro-pgmq ^>=0.19.0.1,
+    keiro-test-support ^>=0.19.0.1,
     kiroku-store >=0.9.0.1 && <0.10,
     optparse-applicative >=0.18 && <0.20,
     pgmq-migration >=0.6.1.1 && <0.7,