diff --git a/typed-protocols-cborg/typed-protocols-cborg.cabal b/typed-protocols-cborg/typed-protocols-cborg.cabal
index f801ffda..e770a0e0 100644
--- a/typed-protocols-cborg/typed-protocols-cborg.cabal
+++ b/typed-protocols-cborg/typed-protocols-cborg.cabal
@@ -22,7 +22,7 @@ library
                      bytestring      >=0.10  && <0.13,
                      cborg           >=0.2.1 && <0.3,
 
-                     io-classes,
+                     io-classes     ^>=1.5,
                      typed-protocols
 
   hs-source-dirs:    src
diff --git a/typed-protocols-examples/typed-protocols-examples.cabal b/typed-protocols-examples/typed-protocols-examples.cabal
index 3e8987a2..592a9817 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:             0.2.0.3
+version:             0.2.0.2
 synopsis:            Examples and tests for the typed-protocols framework
 -- description:
 license:             Apache-2.0
@@ -48,7 +48,8 @@ library
                      cborg,
                      serialise,
                      contra-tracer,
-                     io-classes:{io-classes,si-timers},
+                     io-classes,
+                     si-timers,
                      time,
                      typed-protocols,
                      typed-protocols-cborg
@@ -76,8 +77,9 @@ test-suite test
                    , typed-protocols
                    , typed-protocols-cborg
                    , typed-protocols-examples
-                   , io-classes:{io-classes,si-timers}
+                   , io-classes
                    , io-sim
+                   , si-timers
                    , QuickCheck
                    , tasty
                    , tasty-quickcheck
diff --git a/typed-protocols/CHANGELOG.md b/typed-protocols/CHANGELOG.md
index 16b444cb..59c0ee18 100644
--- a/typed-protocols/CHANGELOG.md
+++ b/typed-protocols/CHANGELOG.md
@@ -1,16 +1,6 @@
-# Revision history for typed-protocols-cborg
+# Revision history for typed-protocols
 
 ## 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`.
-
-## 0.1.0.5 -- 2023-03-08
-
-* Support `ghc-9.6.1`.
-* Use `io-classes-1.1.0.0`.
-
-
+* unbuildable (with `base < 0` constraint in CHaP); We cannot support
+`io-classes-1.{6,7}` until `Haskell.Nix` support for public sublibraries is
+ merged.
diff --git a/typed-protocols/typed-protocols.cabal b/typed-protocols/typed-protocols.cabal
index a4788e89..3c0d573c 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:             0.1.1.1
+version:             0.1.1.0
 synopsis:            A framework for strongly typed protocols
 -- description:
 license:             Apache-2.0
@@ -32,7 +32,7 @@ library
                    , TypeOperators
                    , BangPatterns
   build-depends:     base,
-                     io-classes ^>= 1.7
+                     io-classes >= 1.0 && < 1.6
 
   hs-source-dirs:    src
   default-language:  Haskell2010