diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8bb02992..9afbd93d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -75,6 +75,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Bump `github.com/grpc-ecosystem/grpc-gateway/v2` from 2.18.0 to 2.18.1 ([#1675](https://github.com/NibiruChain/nibiru/pull/1675))
 * Bump `actions/setup-go` from 4 to 5 ([#1696](https://github.com/NibiruChain/nibiru/pull/1696))
 * Bump `golang` from 1.19 to 1.21 ([#1698](https://github.com/NibiruChain/nibiru/pull/1698))
+* [#1678](https://github.com/NibiruChain/nibiru/pull/1678) - chore(deps): collections to v0.4.0 for math.Int value encoder
 
 
 ## [v1.1.0] - 2023-11-20
diff --git a/go.mod b/go.mod
index 70c21776e..322533e1f 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,7 @@ require (
 	github.com/CosmWasm/wasmd v0.44.0
 	github.com/CosmWasm/wasmvm v1.5.0
 	github.com/MakeNowJust/heredoc/v2 v2.0.1
-	github.com/NibiruChain/collections v0.3.0
+	github.com/NibiruChain/collections v0.4.0
 	github.com/armon/go-metrics v0.4.1
 	github.com/cometbft/cometbft v0.37.2
 	github.com/cometbft/cometbft-db v0.8.0
diff --git a/go.sum b/go.sum
index 7c421befb..ec9a85ba1 100644
--- a/go.sum
+++ b/go.sum
@@ -236,8 +236,8 @@ github.com/MakeNowJust/heredoc/v2 v2.0.1 h1:rlCHh70XXXv7toz95ajQWOWQnN4WNLt0TdpZ
 github.com/MakeNowJust/heredoc/v2 v2.0.1/go.mod h1:6/2Abh5s+hc3g9nbWLe9ObDIOhaRrqsyY9MWy+4JdRM=
 github.com/Microsoft/go-winio v0.6.0 h1:slsWYD/zyx7lCXoZVlvQrj0hPTM1HI4+v1sIda2yDvg=
 github.com/Microsoft/go-winio v0.6.0/go.mod h1:cTAf44im0RAYeL23bpB+fzCyDH2MJiz2BO69KH/soAE=
-github.com/NibiruChain/collections v0.3.0 h1:DB2RPzzgcHk35lRXuJ1cPOezweAZ6/c/Guq3bAo4W6w=
-github.com/NibiruChain/collections v0.3.0/go.mod h1:tKTlBL+Cs1oJnS4tT9MIaFWr7BWsUXrc7KPzP1LxRBo=
+github.com/NibiruChain/collections v0.4.0 h1:KNJj+CJyqOT/Q33kcVzT2uLYIiwhiFAeZMhGLPge5Og=
+github.com/NibiruChain/collections v0.4.0/go.mod h1:tKTlBL+Cs1oJnS4tT9MIaFWr7BWsUXrc7KPzP1LxRBo=
 github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5 h1:TngWCqHvy9oXAN6lEVMRuU21PR1EtLVZJmdB18Gu3Rw=
 github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5/go.mod h1:lmUJ/7eu/Q8D7ML55dXQrVaamCz2vxCfdQBasLZfHKk=
 github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
diff --git a/x/perp/v2/keeper/dnr.go b/x/perp/v2/keeper/dnr.go
index dfffda830..e9d687191 100644
--- a/x/perp/v2/keeper/dnr.go
+++ b/x/perp/v2/keeper/dnr.go
@@ -1,8 +1,6 @@
 package keeper
 
 import (
-	"math/big"
-
 	"cosmossdk.io/math"
 	"github.com/NibiruChain/collections"
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -12,62 +10,6 @@ import (
 	"github.com/NibiruChain/nibiru/x/common/asset"
 )
 
-// IntValueEncoder instructs collections on how to encode a math.Int as a value.
-// TODO: move to collections.
-var IntValueEncoder collections.ValueEncoder[math.Int] = intValueEncoder{}
-
-// IntKeyEncoder instructs collections on how to encode a math.Int as a key.
-// NOTE: unsafe to use as the first part of a composite key.
-var IntKeyEncoder collections.KeyEncoder[math.Int] = intKeyEncoder{}
-
-type intValueEncoder struct{}
-
-func (intValueEncoder) Encode(value math.Int) []byte {
-	return IntKeyEncoder.Encode(value)
-}
-
-func (intValueEncoder) Decode(b []byte) math.Int {
-	_, got := IntKeyEncoder.Decode(b)
-	return got
-}
-
-func (intValueEncoder) Stringify(value math.Int) string {
-	return IntKeyEncoder.Stringify(value)
-}
-
-func (intValueEncoder) Name() string {
-	return "math.Int"
-}
-
-type intKeyEncoder struct{}
-
-const maxIntKeyLen = math.MaxBitLen / 8
-
-func (intKeyEncoder) Encode(key math.Int) []byte {
-	if key.IsNil() {
-		panic("cannot encode invalid math.Int")
-	}
-	if key.IsNegative() {
-		panic("cannot encode negative math.Int")
-	}
-	i := key.BigInt()
-
-	be := i.Bytes()
-	padded := make([]byte, maxIntKeyLen)
-	copy(padded[maxIntKeyLen-len(be):], be)
-	return padded
-}
-
-func (intKeyEncoder) Decode(b []byte) (int, math.Int) {
-	if len(b) != maxIntKeyLen {
-		panic("invalid key length")
-	}
-	i := new(big.Int).SetBytes(b)
-	return maxIntKeyLen, math.NewIntFromBigInt(i)
-}
-
-func (intKeyEncoder) Stringify(key math.Int) string { return key.String() }
-
 // maybeUpdateDnREpoch checks if the current epoch hook call matches the
 // epoch name that targets discounts and rebates, if it does then we simply
 // invoke the StartNewEpoch function to kickstart a new epoch.
diff --git a/x/perp/v2/keeper/dnr_int_encoder_test.go b/x/perp/v2/keeper/dnr_int_encoder_test.go
deleted file mode 100644
index f59ce1bd3..000000000
--- a/x/perp/v2/keeper/dnr_int_encoder_test.go
+++ /dev/null
@@ -1,59 +0,0 @@
-package keeper
-
-import (
-	"math/big"
-	"testing"
-
-	"cosmossdk.io/math"
-	sdk "github.com/cosmos/cosmos-sdk/types"
-	"github.com/stretchr/testify/require"
-)
-
-func TestIntEncoder(t *testing.T) {
-	// we test our assumptions around int are correct.
-	outOfBounds := new(big.Int).Lsh(big.NewInt(1), 256)       // 2^256
-	maxBigInt := new(big.Int).Sub(outOfBounds, big.NewInt(1)) // 2^256 - 1
-	require.Equal(t, maxBigInt.BitLen(), math.MaxBitLen)
-	require.Greater(t, outOfBounds.BitLen(), math.MaxBitLen)
-
-	require.NotPanics(t, func() {
-		sdk.NewIntFromBigInt(maxBigInt)
-	})
-	require.Panics(t, func() {
-		sdk.NewIntFromBigInt(outOfBounds)
-	})
-
-	require.Equal(t, maxIntKeyLen, len(maxBigInt.Bytes()))
-
-	// test encoding ordering
-	enc1 := IntKeyEncoder.Encode(sdk.NewInt(50_000))
-	enc2 := IntKeyEncoder.Encode(sdk.NewInt(100_000))
-	require.Less(t, enc1, enc2)
-
-	// test decoding
-	size, got1 := IntKeyEncoder.Decode(enc1)
-	require.Equal(t, maxIntKeyLen, size)
-	_, got2 := IntKeyEncoder.Decode(enc2)
-	require.Equal(t, sdk.NewInt(50_000), got1)
-	require.Equal(t, sdk.NewInt(100_000), got2)
-
-	// require panics on negative values
-	require.Panics(t, func() {
-		IntKeyEncoder.Encode(sdk.NewInt(-1))
-	})
-	// require panics on invalid int
-	require.Panics(t, func() {
-		IntKeyEncoder.Encode(math.Int{})
-	})
-
-	// test value encoder
-	value := sdk.NewInt(50_000)
-	valueBytes := IntValueEncoder.Encode(value)
-	gotValue := IntValueEncoder.Decode(valueBytes)
-	require.Equal(t, value, gotValue)
-
-	// panics on invalid math.Int
-	require.Panics(t, func() {
-		IntValueEncoder.Encode(math.Int{})
-	})
-}
diff --git a/x/perp/v2/keeper/keeper.go b/x/perp/v2/keeper/keeper.go
index 7f60ccd36..998e36b7f 100644
--- a/x/perp/v2/keeper/keeper.go
+++ b/x/perp/v2/keeper/keeper.go
@@ -103,21 +103,21 @@ func NewKeeper(
 		GlobalVolumes: collections.NewMap(
 			storeKey, NamespaceGlobalVolumes,
 			collections.Uint64KeyEncoder,
-			IntValueEncoder,
+			collections.IntValueEncoder,
 		),
 		TraderVolumes: collections.NewMap(
 			storeKey, NamespaceUserVolumes,
 			collections.PairKeyEncoder(collections.AccAddressKeyEncoder, collections.Uint64KeyEncoder),
-			IntValueEncoder,
+			collections.IntValueEncoder,
 		),
 		GlobalDiscounts: collections.NewMap(
 			storeKey, NamespaceGlobalDiscounts,
-			IntKeyEncoder,
+			collections.IntKeyEncoder,
 			collections.DecValueEncoder,
 		),
 		TraderDiscounts: collections.NewMap(
 			storeKey, NamespaceUserDiscounts,
-			collections.PairKeyEncoder(collections.AccAddressKeyEncoder, IntKeyEncoder),
+			collections.PairKeyEncoder(collections.AccAddressKeyEncoder, collections.IntKeyEncoder),
 			collections.DecValueEncoder,
 		),
 		EpochRebateAllocations: collections.NewMap(