diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@
 
 ## [Unreleased]
 
+## [0.3.0.0] - 2026-09-11
+
+### Removed
+
+- Dependency on `effectful-core` and `effectful-plugin`.
+
 ## [0.2.0.0] - 2026-09-10
 
 ### Changed
diff --git a/tricorder-types.cabal b/tricorder-types.cabal
--- a/tricorder-types.cabal
+++ b/tricorder-types.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           tricorder-types
-version:        0.2.0.0
+version:        0.3.0.0
 synopsis:       Shared domain types for various Tricorder components
 description:    Shared domain types for various Tricorder components like
                 [Tricorder itself](https://hackage.haskell.org/package/tricorder) and
@@ -58,13 +58,11 @@
       StrictData
       TemplateHaskell
       TypeFamilies
-  ghc-options: -Weverything -Wno-unsafe -Wno-missing-safe-haskell-mode -Wno-monomorphism-restriction -Wno-missing-kind-signatures -Wno-missing-local-signatures -Wno-missing-import-lists -Wno-implicit-prelude -Wno-unticked-promoted-constructors -Wno-unused-packages -Wno-all-missed-specialisations -Wno-missed-specialisations -fplugin=Effectful.Plugin -threaded
+  ghc-options: -Weverything -Wno-unsafe -Wno-missing-safe-haskell-mode -Wno-monomorphism-restriction -Wno-missing-kind-signatures -Wno-missing-local-signatures -Wno-missing-import-lists -Wno-implicit-prelude -Wno-unticked-promoted-constructors -Wno-unused-packages -Wno-all-missed-specialisations -Wno-missed-specialisations
   build-depends:
       aeson >=2.2 && <2.4
     , atelier-prelude ==0.3.*
     , base >=4.18 && <4.23
-    , effectful-core ==2.7.*
-    , effectful-plugin ==2.2.*
     , text ==2.1.*
   mixins:
       base hiding (Prelude)