diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 0.4.0 (2024-06-01)
+* oops, remove unused temporary `singletons` dependency
+
 ## 0.3.0 (2024-06-01)
 * remove `Sing`, provide `SingI` instead
 * add `SBool` (singled booleans)
diff --git a/singleraeh.cabal b/singleraeh.cabal
--- a/singleraeh.cabal
+++ b/singleraeh.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           singleraeh
-version:        0.3.0
+version:        0.4.0
 synopsis:       raehik's singletons
 description:    Please see README.md.
 category:       Types, Data
@@ -51,5 +51,4 @@
   ghc-options: -Wall -Wno-unticked-promoted-constructors
   build-depends:
       base >=4.18 && <5
-    , singletons >=3.0.2 && <3.1
   default-language: GHC2021