diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,9 @@
+0.3.3.1
+===
+
+- removed doctest-parallel test suite, use cabal-docspec in CI instead
+- updated CI to use cabal-docspec 0.0.0.20250606
+
 0.3.3
 ===
 
diff --git a/formatn.cabal b/formatn.cabal
--- a/formatn.cabal
+++ b/formatn.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: formatn
-version: 0.3.3.0
+version: 0.3.3.1
 license: BSD-3-Clause
 license-file: LICENSE
 copyright: Tony Day (c) 2016
@@ -52,15 +52,3 @@
 
   exposed-modules: Data.FormatN
 
-test-suite doctests
-  import: ghc-options-stanza
-  default-language: GHC2024
-  main-is: doctests.hs
-  hs-source-dirs: test
-  build-depends:
-    QuickCheck >=2.14.2 && <2.17,
-    base >=4.14 && <5,
-    doctest-parallel >=0.3 && <0.5,
-
-  ghc-options: -threaded
-  type: exitcode-stdio-1.0
diff --git a/test/doctests.hs b/test/doctests.hs
deleted file mode 100644
--- a/test/doctests.hs
+++ /dev/null
@@ -1,8 +0,0 @@
-module Main where
-
-import System.Environment (getArgs)
-import Test.DocTest (mainFromCabal)
-import Prelude (IO, (=<<))
-
-main :: IO ()
-main = mainFromCabal "formatn" =<< getArgs