diff --git a/cabal.project b/cabal.project
index e4454824..0b0e5376 100644
--- a/cabal.project
+++ b/cabal.project
@@ -11,7 +11,7 @@ repository cardano-haskell-packages
     d4a35cd3121aa00d18544bb0ac01c3e1691d618f462c46129271bccf39f7e8ee
 
 index-state:
-    hackage.haskell.org 2024-07-01T07:04:30Z
+    hackage.haskell.org 2024-08-27T07:58:31Z
   , cardano-haskell-packages 2024-06-27T10:53:24Z
 
 packages: ./typed-protocols
diff --git a/typed-protocols-cborg/src/Network/TypedProtocol/Codec/CBOR.hs b/typed-protocols-cborg/src/Network/TypedProtocol/Codec/CBOR.hs
index 22d1721e..bb2183a5 100644
--- a/typed-protocols-cborg/src/Network/TypedProtocol/Codec/CBOR.hs
+++ b/typed-protocols-cborg/src/Network/TypedProtocol/Codec/CBOR.hs
@@ -11,7 +11,7 @@ module Network.TypedProtocol.Codec.CBOR
   ) where
 
 import           Control.Monad.Class.MonadST (MonadST (..))
-import           Control.Monad.ST
+import           Control.Monad.ST hiding (stToIO)
 
 import qualified Codec.CBOR.Decoding as CBOR (Decoder)
 import qualified Codec.CBOR.Encoding as CBOR (Encoding)
@@ -68,7 +68,7 @@ mkCodecCborStrictBS cborMsgEncode cborMsgDecode =
       :: (forall s. CBOR.Decoder s a)
       -> m (DecodeStep BS.ByteString DeserialiseFailure m a)
     convertCborDecoder cborDecode =
-        withLiftST (convertCborDecoderBS cborDecode)
+        convertCborDecoderBS cborDecode stToIO
 
 convertCborDecoderBS
   :: forall s m a. Functor m
@@ -123,7 +123,7 @@ mkCodecCborLazyBS  cborMsgEncode cborMsgDecode =
       :: (forall s. CBOR.Decoder s a)
       -> m (DecodeStep LBS.ByteString CBOR.DeserialiseFailure m a)
     convertCborDecoder cborDecode =
-        withLiftST (convertCborDecoderLBS cborDecode)
+        convertCborDecoderLBS cborDecode stToIO
 
 convertCborDecoderLBS
   :: forall s m a. Monad m
diff --git a/typed-protocols-examples/typed-protocols-examples.cabal b/typed-protocols-examples/typed-protocols-examples.cabal
index 592a9817..3e8987a2 100644
--- a/typed-protocols-examples/typed-protocols-examples.cabal
+++ b/typed-protocols-examples/typed-protocols-examples.cabal
@@ -1,6 +1,6 @@
 cabal-version:       3.0
 name:                typed-protocols-examples
-version:             0.2.0.2
+version:             0.2.0.3
 synopsis:            Examples and tests for the typed-protocols framework
 -- description:
 license:             Apache-2.0
@@ -48,8 +48,7 @@ library
                      cborg,
                      serialise,
                      contra-tracer,
-                     io-classes,
-                     si-timers,
+                     io-classes:{io-classes,si-timers},
                      time,
                      typed-protocols,
                      typed-protocols-cborg
@@ -77,9 +76,8 @@ test-suite test
                    , typed-protocols
                    , typed-protocols-cborg
                    , typed-protocols-examples
-                   , io-classes
+                   , io-classes:{io-classes,si-timers}
                    , io-sim
-                   , si-timers
                    , QuickCheck
                    , tasty
                    , tasty-quickcheck
diff --git a/typed-protocols/CHANGELOG.md b/typed-protocols/CHANGELOG.md
index 983be47f..16b444cb 100644
--- a/typed-protocols/CHANGELOG.md
+++ b/typed-protocols/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Revision history for typed-protocols-cborg
 
+## 0.1.1.1
+
+* Use `io-classes-1.6`
+
 ## 0.1.0.7 -- 2023-10-20
 
 * Improved performance of `prop_codecs_splitsM` and `prop_codecs_compatM`.
diff --git a/typed-protocols/typed-protocols.cabal b/typed-protocols/typed-protocols.cabal
index 1d92114d..69353ceb 100644
--- a/typed-protocols/typed-protocols.cabal
+++ b/typed-protocols/typed-protocols.cabal
@@ -1,6 +1,6 @@
 cabal-version:       3.0
 name:                typed-protocols
-version:             0.1.1.0
+version:             0.1.1.1
 synopsis:            A framework for strongly typed protocols
 -- description:
 license:             Apache-2.0
@@ -32,7 +32,7 @@ library
                    , TypeOperators
                    , BangPatterns
   build-depends:     base,
-                     io-classes >= 1.0 && < 1.4
+                     io-classes ^>= 1.6
 
   hs-source-dirs:    src
   default-language:  Haskell2010