diff --git a/cabal.project b/cabal.project
index 166f9349957..b18d1312ee1 100644
--- a/cabal.project
+++ b/cabal.project
@@ -14,9 +14,9 @@ repository cardano-haskell-packages
 -- update either of these.
 index-state:
   -- Bump both the following dates if you need newer packages from Hackage
-  , hackage.haskell.org 2024-10-16T00:00:00Z
+  , hackage.haskell.org 2024-10-20T22:07:04Z
   -- Bump this if you need newer packages from CHaP
-  , cardano-haskell-packages 2024-10-16T00:00:00Z
+  , cardano-haskell-packages 2024-10-10T04:22:19Z
 
 packages: cardano-constitution
           plutus-benchmark
@@ -99,9 +99,23 @@ allow-newer:
 -- allow-older: *:nothunks
 
 -- -------------------------------------------------------------------------------------------------
--- Following currently required for building with ghc-9.10.
+-- The following two SRPs do two things:
+--   * switch from cryptonite package (deprecated) to crypton (drop in replacement)
+--   * New major version of cardano-crypto-class which is incompatible with current
+--     cardano-ledger@master
 
-constraints:
-  -- The API has changed for version 2.2, ledger depends on the old version and ledger will not
-  -- be updated until after the Conway release.
-  , cardano-crypto-class ^>= 2.1
+source-repository-package
+  type: git
+  location: https://github.com/IntersectMBO/cardano-crypto
+  tag: 790a3027a210ed3684ea9ffa1da504873d96b7de
+  --sha256: 1wlyvqgaf4gwzp80gpf334dwpcq2vbgywv2r31mk0iy469n1slbi
+
+source-repository-package
+  type: git
+  location: https://github.com/IntersectMBO/cardano-base
+  tag: 843454149d7b18f145fb168176274e659df27caf
+  --sha256: 18p7ylrhq0p59189fh4aby2gjl812n74inwydqvkhpdj46dzf8zs
+  subdir:
+    cardano-crypto-class
+    cardano-crypto-tests
+    cardano-mempool
diff --git a/doc/notes/model/UTxO.hsproj/UTxO.cabal b/doc/notes/model/UTxO.hsproj/UTxO.cabal
index 688ad93633c..2fd16637825 100644
--- a/doc/notes/model/UTxO.hsproj/UTxO.cabal
+++ b/doc/notes/model/UTxO.hsproj/UTxO.cabal
@@ -21,7 +21,7 @@ executable UTxO
     , bytestring
     , containers
     , cryptohash
-    , cryptonite
+    , crypton
     , hashable
     , memory
     , template-haskell
diff --git a/plutus-benchmark/plutus-benchmark.cabal b/plutus-benchmark/plutus-benchmark.cabal
index 668f5858a06..2a460d1b022 100644
--- a/plutus-benchmark/plutus-benchmark.cabal
+++ b/plutus-benchmark/plutus-benchmark.cabal
@@ -482,7 +482,7 @@ library marlowe-internal
   build-depends:
     , base
     , bytestring
-    , cardano-crypto-class             >=2.1.5 && <2.3
+    , cardano-crypto-class
     , directory
     , filepath
     , mtl
diff --git a/plutus-core/changelog.d/20241023_153400_cryptonite.md b/plutus-core/changelog.d/20241023_153400_cryptonite.md
new file mode 100644
index 00000000000..198168e9cc8
--- /dev/null
+++ b/plutus-core/changelog.d/20241023_153400_cryptonite.md
@@ -0,0 +1,3 @@
+### Added
+
+- Switch from `cryptonite` library to `crypton` (a drop in replacement).
diff --git a/plutus-core/plutus-core.cabal b/plutus-core/plutus-core.cabal
index 8469b892f22..508054c4a81 100644
--- a/plutus-core/plutus-core.cabal
+++ b/plutus-core/plutus-core.cabal
@@ -293,12 +293,12 @@ library
     , bytestring
     , bytestring-strict-builder
     , cardano-crypto
-    , cardano-crypto-class        ^>=2.1.5
+    , cardano-crypto-class        ^>=2.2
     , cassava
     , cborg
     , composition-prelude         >=1.1.0.1
     , containers
-    , cryptonite
+    , crypton
     , data-default-class
     , deepseq
     , dependent-sum               >=0.7.1.0
diff --git a/plutus-metatheory/changelog.d/20241023_153400_cryptonite.md b/plutus-metatheory/changelog.d/20241023_153400_cryptonite.md
new file mode 100644
index 00000000000..198168e9cc8
--- /dev/null
+++ b/plutus-metatheory/changelog.d/20241023_153400_cryptonite.md
@@ -0,0 +1,3 @@
+### Added
+
+- Switch from `cryptonite` library to `crypton` (a drop in replacement).
diff --git a/plutus-metatheory/plutus-metatheory.cabal b/plutus-metatheory/plutus-metatheory.cabal
index be0c4f437d9..b4bb2c93e2e 100644
--- a/plutus-metatheory/plutus-metatheory.cabal
+++ b/plutus-metatheory/plutus-metatheory.cabal
@@ -59,7 +59,7 @@ library
     , base
     , bytestring
     , composition-prelude
-    , cryptonite
+    , crypton
     , extra
     , filepath
     , ghc-prim