diff --git a/README.md b/README.md
index 8ef5dce19..2ffb28f45 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@
 # install rocksdb
 add-apt-repository ppa:ethcore/ethcore
 apt-get update
-apt-get install -y --force-yes librocksdb
+apt-get install -y --force-yes librocksdb-dev
 
 # install multirust
 curl -sf https://raw.githubusercontent.com/brson/multirust/master/blastoff.sh | sh -s -- --yes
diff --git a/ethcore/res/ethereum/frontier.json b/ethcore/res/ethereum/frontier.json
index 33f0b833c..e53912a6d 100644
--- a/ethcore/res/ethereum/frontier.json
+++ b/ethcore/res/ethereum/frontier.json
@@ -3,7 +3,7 @@
 	"engineName": "Ethash",
 	"params": {
 		"accountStartNonce": "0x00",
-		"frontierCompatibilityModeLimit": "0xf4240fff",
+		"frontierCompatibilityModeLimit": "0x10c8e0",
 		"maximumExtraDataSize": "0x20",
 		"tieBreakingGas": false,
 		"minGasLimit": "0x1388",
diff --git a/ethcore/res/ethereum/frontier_like_test.json b/ethcore/res/ethereum/frontier_like_test.json
index 7ab6a58f4..553bb8018 100644
--- a/ethcore/res/ethereum/frontier_like_test.json
+++ b/ethcore/res/ethereum/frontier_like_test.json
@@ -3,7 +3,7 @@
 	"engineName": "Ethash",
 	"params": {
 		"accountStartNonce": "0x00",
-		"frontierCompatibilityModeLimit": "0xf4240fff",
+		"frontierCompatibilityModeLimit": "0x10c8e0",
 		"maximumExtraDataSize": "0x20",
 		"tieBreakingGas": false,
 		"minGasLimit": "0x1388",
diff --git a/ethcore/res/ethereum/morden.json b/ethcore/res/ethereum/morden.json
index cdcf8c7dc..0d0c2489d 100644
--- a/ethcore/res/ethereum/morden.json
+++ b/ethcore/res/ethereum/morden.json
@@ -3,7 +3,7 @@
 	"engineName": "Ethash",
 	"params": {
 		"accountStartNonce": "0x0100000",
-		"frontierCompatibilityModeLimit": "0xdbba0",
+		"frontierCompatibilityModeLimit": "0x10c8e0",
 		"maximumExtraDataSize": "0x20",
 		"tieBreakingGas": false,
 		"minGasLimit": "0x1388",