diff --git a/app/upgrades/v17/upgrades.go b/app/upgrades/v17/upgrades.go
index 154b65029..498f0b1a9 100644
--- a/app/upgrades/v17/upgrades.go
+++ b/app/upgrades/v17/upgrades.go
@@ -14,7 +14,7 @@ import (
 func CreateV17UpgradeHandler(
 	mm *module.Manager,
 	cfg module.Configurator,
-	_ *keepers.AppKeepers,
+	keepers *keepers.AppKeepers,
 ) upgradetypes.UpgradeHandler {
 	return func(ctx sdk.Context, _ upgradetypes.Plan, vm module.VersionMap) (module.VersionMap, error) {
 		logger := ctx.Logger().With("upgrade", UpgradeName)
@@ -30,6 +30,24 @@ func CreateV17UpgradeHandler(
 		}
 		logger.Info(fmt.Sprintf("post migrate version map: %v", versionMap))
 
+		// x/Mint
+		// Double blocks per year (from 6 seconds to 3 = 2x blocks per year)
+		mintParams := keepers.MintKeeper.GetParams(ctx)
+		mintParams.BlocksPerYear *= 2
+		if err = keepers.MintKeeper.SetParams(ctx, mintParams); err != nil {
+			return nil, err
+		}
+		logger.Info(fmt.Sprintf("updated minted blocks per year logic to %v", mintParams))
+
+		// x/Slashing
+		// Double slashing window due to double blocks per year
+		slashingParams := keepers.SlashingKeeper.GetParams(ctx)
+		slashingParams.SignedBlocksWindow *= 2
+		if err := keepers.SlashingKeeper.SetParams(ctx, slashingParams); err != nil {
+			return nil, err
+		}
+		logger.Info(fmt.Sprintf("updated slashing params to %v", slashingParams))
+
 		return versionMap, err
 	}
 }
diff --git a/cmd/junod/cmd/root.go b/cmd/junod/cmd/root.go
index ccb66a6a8..bb33eae45 100644
--- a/cmd/junod/cmd/root.go
+++ b/cmd/junod/cmd/root.go
@@ -5,6 +5,7 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"time"
 
 	wasm "github.com/CosmWasm/wasmd/x/wasm"
 	wasmkeeper "github.com/CosmWasm/wasmd/x/wasm/keeper"
@@ -110,8 +111,8 @@ func initTendermintConfig() *tmcfg.Config {
 	// cfg.P2P.MaxNumInboundPeers = 100
 	// cfg.P2P.MaxNumOutboundPeers = 40
 
-	// 2 seconds + 1 second tendermint = 3 second blocks (v15 upgrade)
-	// cfg.Consensus.TimeoutCommit = 2 * time.Second
+	// 2 seconds + 1 second tendermint = 3 second blocks
+	cfg.Consensus.TimeoutCommit = 2 * time.Second
 
 	return cfg
 }
diff --git a/interchaintest/chain_upgrade_test.go b/interchaintest/chain_upgrade_test.go
index 663ca8ea6..ee0e005a9 100644
--- a/interchaintest/chain_upgrade_test.go
+++ b/interchaintest/chain_upgrade_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"
 	"time"
 
+	helpers "github.com/CosmosContracts/juno/tests/interchaintest/helpers"
 	cosmosproto "github.com/cosmos/gogoproto/proto"
 	"github.com/docker/docker/client"
 	"github.com/strangelove-ventures/interchaintest/v7"
@@ -39,6 +40,7 @@ func CosmosChainUpgradeTest(t *testing.T, chainName, initialVersion, upgradeBran
 	t.Log(chainName, initialVersion, upgradeBranchVersion, upgradeRepo, upgradeName)
 
 	numVals, numNodes := 4, 4
+	// TODO: use PR 788's impl of 'CreateChain' to modify the x/mint genesis to match mainnet.
 	chains := CreateThisBranchChain(t, numVals, numNodes)
 	chain := chains[0].(*cosmos.CosmosChain)
 
@@ -61,8 +63,29 @@ func CosmosChainUpgradeTest(t *testing.T, chainName, initialVersion, upgradeBran
 
 	ValidatorVoting(t, ctx, chain, proposalID, height, haltHeight)
 
+	preUpgradeChecks(t, ctx, chain)
+
 	UpgradeNodes(t, ctx, chain, client, haltHeight, upgradeRepo, upgradeBranchVersion)
 
+	postUpgradeChecks(t, ctx, chain)
+
+}
+
+func preUpgradeChecks(t *testing.T, ctx context.Context, chain *cosmos.CosmosChain) {
+	mp := helpers.GetMintParams(t, ctx, chain)
+	// mainnet it is 5048093, but we are just ensuring the upgrade applies correctly from default.
+	require.Equal(t, mp.BlocksPerYear, uint64(6311520))
+
+	sp := helpers.GetSlashingParams(t, ctx, chain)
+	require.Equal(t, sp.SignedBlocksWindow, uint64(100))
+}
+
+func postUpgradeChecks(t *testing.T, ctx context.Context, chain *cosmos.CosmosChain) {
+	mp := helpers.GetMintParams(t, ctx, chain)
+	require.Equal(t, mp.BlocksPerYear, uint64(6311520*2)) // double default
+
+	sp := helpers.GetSlashingParams(t, ctx, chain)
+	require.Equal(t, sp.SignedBlocksWindow, uint64(100*2))
 }
 
 func UpgradeNodes(t *testing.T, ctx context.Context, chain *cosmos.CosmosChain, client *client.Client, haltHeight uint64, upgradeRepo, upgradeBranchVersion string) {
diff --git a/interchaintest/helpers/mint.go b/interchaintest/helpers/mint.go
new file mode 100644
index 000000000..8d763ac9f
--- /dev/null
+++ b/interchaintest/helpers/mint.go
@@ -0,0 +1,32 @@
+package helpers
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+
+	minttypes "github.com/CosmosContracts/juno/v17/x/mint/types"
+	"github.com/strangelove-ventures/interchaintest/v7/chain/cosmos"
+	"github.com/stretchr/testify/require"
+)
+
+func GetMintParams(t *testing.T, ctx context.Context, chain *cosmos.CosmosChain) minttypes.Params {
+	cmd := []string{
+		"junod", "query", "mint", "params",
+		"--node", chain.GetRPCAddress(),
+		"--chain-id", chain.Config().ChainID,
+		"--output", "json",
+	}
+	stdout, _, err := chain.Exec(ctx, cmd, nil)
+	require.NoError(t, err)
+
+	debugOutput(t, string(stdout))
+
+	results := minttypes.QueryParamsResponse{}
+	err = json.Unmarshal(stdout, &results)
+	require.NoError(t, err)
+
+	t.Log(results)
+
+	return results.Params
+}
diff --git a/interchaintest/helpers/slashing.go b/interchaintest/helpers/slashing.go
new file mode 100644
index 000000000..e6daf7e18
--- /dev/null
+++ b/interchaintest/helpers/slashing.go
@@ -0,0 +1,32 @@
+package helpers
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+
+	slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
+	"github.com/strangelove-ventures/interchaintest/v7/chain/cosmos"
+	"github.com/stretchr/testify/require"
+)
+
+func GetSlashingParams(t *testing.T, ctx context.Context, chain *cosmos.CosmosChain) slashingtypes.Params {
+	cmd := []string{
+		"junod", "query", "slashing", "params",
+		"--node", chain.GetRPCAddress(),
+		"--chain-id", chain.Config().ChainID,
+		"--output", "json",
+	}
+	stdout, _, err := chain.Exec(ctx, cmd, nil)
+	require.NoError(t, err)
+
+	debugOutput(t, string(stdout))
+
+	results := slashingtypes.QueryParamsResponse{}
+	err = json.Unmarshal(stdout, &results)
+	require.NoError(t, err)
+
+	t.Log(results)
+
+	return results.Params
+}