diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to the [Haskell Package Versioning Policy](https://pvp.haskell.org/).
 
+## [1.0.1] - 2026-10-01
+
+### Changed
+
+- Removed redundant environment cloning and lock allocation per HTTP/2 stream in `withHttp2Stream` and push-promise handling. Streams now run synchronously on the calling thread without overhead.
+
 ## [1.0.0] - 2026-07-07
 
 ### Added
diff --git a/http2-client-effectful.cabal b/http2-client-effectful.cabal
--- a/http2-client-effectful.cabal
+++ b/http2-client-effectful.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: http2-client-effectful
-version: 1.0.0
+version: 1.0.1
 synopsis: Effectful bindings for the http2-client library
 description:
   Adaptation of the @<https://hackage.haskell.org/package/http2-client http2-client>@ library for the @<https://hackage.haskell.org/package/effectful effectful>@ ecosystem.
@@ -13,7 +13,7 @@
 bug-reports: https://issues.digital-autonomy.institute
 category: Web
 build-type: Simple
-extra-source-files:
+extra-doc-files:
   CHANGELOG.md
 
 common common
@@ -50,9 +50,9 @@
   build-depends:
     base >=4.10 && <5,
     bytestring >=0.12 && <0.13,
-    effectful >=2.6 && <2.7,
+    effectful >=2.6 && <2.8,
     http-types >=0.12 && <0.13,
-    http2 >=5.3 && <5.4,
+    http2 >=5.3 && <5.5,
     http2-client >=0.10 && <0.11,
     mtl >=2.3 && <2.4,
 
diff --git a/src/Effectful/Http2Client.hs b/src/Effectful/Http2Client.hs
--- a/src/Effectful/Http2Client.hs
+++ b/src/Effectful/Http2Client.hs
@@ -15,7 +15,7 @@
 -- and client teardown, so the rest of the operations here can be used
 -- directly in your effect stack.
 --
--- = Example Usage
+-- = Example usage
 --
 -- === Opening a connection and running a client
 --
@@ -341,7 +341,7 @@
         , _sendDataChunk = \flagMod dat -> unsafeRunClientIO (Client._sendDataChunk stream flagMod dat)
         , _handlePushPromise = \sid hdrs handler ->
             either throwError pure
-                =<< unsafeConcUnliftIO Ephemeral (Limited 1) \unlift -> Client.runClientIO do
+                =<< unsafeSeqUnliftIO \unlift -> Client.runClientIO do
                     let unliftClientIO :: Eff es b -> ClientIO b
                         unliftClientIO = ExceptT . unlift . runErrorNoCallStack @ClientError . inject
                     Client._handlePushPromise
@@ -390,7 +390,7 @@
 withHttp2Stream f = do
     Http2Client client <- getStaticRep
     either throwError pure
-        =<< unsafeConcUnliftIO Ephemeral (Limited 1) \unlift -> Client.runClientIO do
+        =<< unsafeSeqUnliftIO \unlift -> Client.runClientIO do
             let unliftClientIO :: Eff es b -> ClientIO b
                 unliftClientIO = ExceptT . unlift . runErrorNoCallStack @ClientError . inject
             Client._startStream client $ unliftStreamDefinition unliftClientIO . f . liftHttp2Stream client