Support GHC 9.14.1 and fix Tasty version drift

.github/workflows/haskell-ci.yml

@@ -43,14 +43,19 @@ jobs:
     strategy:
       matrix:
         include:
-          - compiler: ghc-9.12.2
+          - compiler: ghc-9.14.1
             compilerKind: ghc
-            compilerVersion: 9.12.2
+            compilerVersion: 9.14.1
             setup-method: ghcup
             allow-failure: false
-          - compiler: ghc-9.10.2
+          - compiler: ghc-9.12.4
             compilerKind: ghc
-            compilerVersion: 9.10.2
+            compilerVersion: 9.12.4
+            setup-method: ghcup
+            allow-failure: false
+          - compiler: ghc-9.10.3
+            compilerKind: ghc
+            compilerVersion: 9.10.3
             setup-method: ghcup
             allow-failure: false
           - compiler: ghc-9.8.4

.github/workflows/simple.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         os: [macos-latest, windows-latest]
         # Older GHCs need LLVM on macos-latest (ARM)
-        ghc: ['9.4.8','9.6.6','9.8.2','9.10.2']
+        ghc: ['9.4.8','9.6.6','9.8.2','9.10.2','9.14.1']
       fail-fast: false
     timeout-minutes:
       60

CHANGES.md

@@ -1,3 +1,12 @@
+### Version 0.7.0.2 (2026-10-01)
+
+  * Support GHC-9.14.1. Widen `base`, `template-haskell` and `containers`
+    upper bounds accordingly.
+  * Fix test suite flakiness: all tests shared a single `Connection`, and
+    `tasty`'s default of running tests concurrently (one thread per core)
+    could interleave queries from different tests on that connection,
+    which libpq does not support. Tests now run sequentially.
+
 ### Version 0.7.0.0 (2023-07-31)
 
   * Remove Eq Null instance. (Future `base` may break it, we remove it profilacticly).

postgresql-simple.cabal

@@ -1,6 +1,6 @@
 cabal-version:      1.12
 name:               postgresql-simple
-version:            0.7.0.1
+version:            0.7.0.2
 synopsis:           Mid-Level PostgreSQL client library
 description:
   Mid-Level PostgreSQL client library, forked from mysql-simple.
@@ -31,8 +31,9 @@ tested-with:
    || ==9.4.8
    || ==9.6.7
    || ==9.8.4
-   || ==9.10.2
-   || ==9.12.2
+   || ==9.10.3
+   || ==9.12.4
+   || ==9.14.1
 
 library
   default-language:   Haskell2010
@@ -78,10 +79,10 @@ library
 
   -- GHC bundled libs
   build-depends:
-      base              >=4.12.0.0 && <4.22
+      base              >=4.12.0.0 && <4.23
     , bytestring        >=0.10.8.2 && <0.13
-    , containers        >=0.6.0.1  && <0.8
-    , template-haskell  >=2.14.0.0 && <2.24
+    , containers        >=0.6.0.1  && <0.9
+    , template-haskell  >=2.14.0.0 && <2.25
     , text              >=1.2.3.0  && <1.3  || >=2.0 && <2.2
     , time-compat       >=1.9.5    && <1.12
     , transformers      >=0.5.6.2  && <0.7

test/Main.hs

@@ -51,6 +51,7 @@ import System.Environment (getEnvironment)
 
 import Test.Tasty
 import Test.Tasty.Golden
+import Test.Tasty.Runners (NumThreads(..))
 import Notify
 import Serializable
 import Time
@@ -623,7 +624,12 @@ withTestEnv connstr cb =
 
 main :: IO ()
 main = withConnstring $ \connstring -> do
-    withTestEnv connstring (defaultMain . tests)
+    -- All tests share a single 'Connection' (see 'TestEnv'), and libpq
+    -- only ever allows one command in flight per connection. tasty's
+    -- default 'NumThreads' runs independent top-level tests concurrently,
+    -- which corrupts that shared connection's protocol/transaction state,
+    -- so force sequential execution here.
+    withTestEnv connstring (defaultMain . localOption (NumThreads 1) . tests)
 
 withConnstring :: (BS8.ByteString -> IO ()) -> IO ()
 withConnstring kont = do