diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47d1d4775c0..daf17dc1a5f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ changes.
 
 ## [0.13.0] - UNRELEASED
 
+- **BREAKING** Changes to `hydra-plutus` scripts.
+
 - Remove hydra-tools package. Move functionality to generate hydra keys to the
   hydra-node executable.
 
diff --git a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
index de6506c6957..967b3ff2dac 100644
--- a/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
+++ b/hydra-node/test/Hydra/Chain/Direct/Contract/Close.hs
@@ -17,6 +17,7 @@ import Hydra.Chain.Direct.Contract.Mutation (
   changeHeadOutputDatum,
   changeMintedTokens,
   replaceContestationDeadline,
+  replaceContestationPeriod,
   replaceContesters,
   replaceHeadId,
   replaceParties,
@@ -42,9 +43,9 @@ import Hydra.Ledger (hashUTxO)
 import Hydra.Ledger.Cardano (genAddressInEra, genOneUTxOFor, genValue, genVerificationKey)
 import Hydra.Ledger.Cardano.Evaluate (genValidityBoundsFromContestationPeriod)
 import Hydra.Party (Party, deriveParty, partyToChain)
-import Hydra.Snapshot (Snapshot (..), SnapshotNumber)
 import Hydra.Plutus.Extras (posixFromUTCTime)
 import Hydra.Plutus.Orphans ()
+import Hydra.Snapshot (Snapshot (..), SnapshotNumber)
 import PlutusLedgerApi.V1.Time (DiffMilliSeconds (..), fromMilliSeconds)
 import PlutusLedgerApi.V2 (BuiltinByteString, POSIXTime, PubKeyHash (PubKeyHash), toBuiltin)
 import Test.Hydra.Fixture (aliceSk, bobSk, carolSk)
@@ -284,6 +285,8 @@ data CloseMutation
     --
     -- Ensures values are preserved between head input and output.
     MutateValueInOutput
+  | -- | Invalidate the tx by changing the contestation period.
+    MutateContestationPeriod
   deriving (Generic, Show, Enum, Bounded)
 
 genCloseMutation :: (Tx, UTxO) -> Gen SomeMutation
@@ -330,6 +333,9 @@ genCloseMutation (tx, _utxo) =
     , SomeMutation (Just $ toErrorCode IncorrectClosedContestationDeadline) MutateContestationDeadline <$> do
         mutatedDeadline <- genMutatedDeadline
         pure $ ChangeOutput 0 $ changeHeadOutputDatum (replaceContestationDeadline mutatedDeadline) headTxOut
+    , SomeMutation (Just $ toErrorCode ChangedParameters) MutateContestationPeriod <$> do
+        mutatedPeriod <- arbitrary
+        pure $ ChangeOutput 0 $ changeHeadOutputDatum (replaceContestationPeriod mutatedPeriod) headTxOut
     , SomeMutation (Just $ toErrorCode InfiniteLowerBound) MutateInfiniteLowerBound . ChangeValidityLowerBound <$> do
         pure TxValidityNoLowerBound
     , SomeMutation (Just $ toErrorCode InfiniteUpperBound) MutateInfiniteUpperBound . ChangeValidityUpperBound <$> do
diff --git a/hydra-plutus/hydra-plutus.cabal b/hydra-plutus/hydra-plutus.cabal
index ccaf4fe62c6..36cdb675170 100644
--- a/hydra-plutus/hydra-plutus.cabal
+++ b/hydra-plutus/hydra-plutus.cabal
@@ -1,6 +1,6 @@
 cabal-version: 2.2
 name:          hydra-plutus
-version:       0.12.0
+version:       0.13.0
 synopsis:      Hydra Plutus Contracts
 author:        IOG
 copyright:     2022 IOG
@@ -100,10 +100,10 @@ library
     , hydra-cardano-api
     , hydra-plutus-extras
     , hydra-prelude
-    , plutus-core           >=1.7 && <1.8
-    , plutus-ledger-api     >=1.7 && <1.8
-    , plutus-tx             >=1.7 && <1.8
-    , plutus-tx-plugin      >=1.7 && <1.8
+    , plutus-core          >=1.7 && <1.8
+    , plutus-ledger-api    >=1.7 && <1.8
+    , plutus-tx            >=1.7 && <1.8
+    , plutus-tx-plugin     >=1.7 && <1.8
     , QuickCheck
     , serialise
     , template-haskell
diff --git a/hydra-plutus/scripts/mHead.plutus b/hydra-plutus/scripts/mHead.plutus
index aecb2208e34..00889667bd3 100644
--- a/hydra-plutus/scripts/mHead.plutus
+++ b/hydra-plutus/scripts/mHead.plutus
@@ -1,5 +1,5 @@
 {
     "type": "PlutusScriptV2",
-    "description": "hydra-mHead-0.11.0-439-g9f4198034",
-    "cborHex": "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+    "description": "hydra-mHead-0.12.0-86-gcd14dca2f",
+    "cborHex": "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 }
diff --git a/hydra-plutus/scripts/vCommit.plutus b/hydra-plutus/scripts/vCommit.plutus
index 19e392620a0..b5383d3f296 100644
--- a/hydra-plutus/scripts/vCommit.plutus
+++ b/hydra-plutus/scripts/vCommit.plutus
@@ -1,5 +1,5 @@
 {
     "type": "PlutusScriptV2",
-    "description": "hydra-vCommit-0.11.0-439-g9f4198034",
+    "description": "hydra-vCommit-0.12.0-86-gcd14dca2f",
     "cborHex": "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"
 }
diff --git a/hydra-plutus/scripts/vHead.plutus b/hydra-plutus/scripts/vHead.plutus
index c7644b60b04..48b8bd63821 100644
--- a/hydra-plutus/scripts/vHead.plutus
+++ b/hydra-plutus/scripts/vHead.plutus
@@ -1,5 +1,5 @@
 {
     "type": "PlutusScriptV2",
-    "description": "hydra-vHead-0.11.0-439-g9f4198034",
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 }
diff --git a/hydra-plutus/scripts/vInitial.plutus b/hydra-plutus/scripts/vInitial.plutus
index 5136c57907e..867dcb5bf23 100644
--- a/hydra-plutus/scripts/vInitial.plutus
+++ b/hydra-plutus/scripts/vInitial.plutus
@@ -1,5 +1,5 @@
 {
     "type": "PlutusScriptV2",
-    "description": "hydra-vInitial-0.11.0-439-g9f4198034",
+    "description": "hydra-vInitial-0.12.0-86-gcd14dca2f",
     "cborHex": 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 }
diff --git a/hydra-plutus/src/Hydra/Contract/Head.hs b/hydra-plutus/src/Hydra/Contract/Head.hs
index 5e12b2b5ac3..7352fcb01ef 100644
--- a/hydra-plutus/src/Hydra/Contract/Head.hs
+++ b/hydra-plutus/src/Hydra/Contract/Head.hs
@@ -281,7 +281,7 @@ checkClose ctx parties initialUtxoHash sig cperiod headPolicyId =
     traceIfFalse $(errorCode HasBoundedValidityCheckFailed) $
       tMax - tMin <= cp
 
-  (closedSnapshotNumber, closedUtxoHash, parties', closedContestationDeadline, headId', contesters') =
+  (closedSnapshotNumber, closedUtxoHash, parties', closedContestationDeadline, cperiod', headId', contesters') =
     -- XXX: fromBuiltinData is super big (and also expensive?)
     case fromBuiltinData @DatumType $ getDatum (headOutputDatum ctx) of
       Just
@@ -292,7 +292,8 @@ checkClose ctx parties initialUtxoHash sig cperiod headPolicyId =
           , contestationDeadline
           , headId
           , contesters
-          } -> (snapshotNumber, utxoHash, p, contestationDeadline, headId, contesters)
+          , contestationPeriod
+          } -> (snapshotNumber, utxoHash, p, contestationDeadline, contestationPeriod, headId, contesters)
       _ -> traceError $(errorCode WrongStateInOutputDatum)
 
   checkSnapshot
@@ -321,6 +322,7 @@ checkClose ctx parties initialUtxoHash sig cperiod headPolicyId =
     traceIfFalse $(errorCode ChangedParameters) $
       headId' == headPolicyId
         && parties' == parties
+        && cperiod' == cperiod
 
   mustInitializeContesters =
     traceIfFalse $(errorCode ContestersNonEmpty) $