diff --git a/HISTORY.md b/HISTORY.md
index ece79558..3ab3119f 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,8 @@
+## 1.5.4 (January 27, 2016)
+
+- one more fix (in `restructRuleset` this time) with merge of rulesets when a ruleset with same specificity places between them (#264)
+- disable partitial merge of rulesets in `@keyframes` rulesets (until sure it's correct)
+
 ## 1.5.3 (January 25, 2016)
 
 - don't override display values with different browser support (#259)
diff --git a/package.json b/package.json
index bd6addeb..e2e87b0c 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "csso",
   "description": "CSSO — CSS optimizer",
-  "version": "1.5.3",
+  "version": "1.5.4",
   "homepage": "https://github.com/css/csso",
   "author": "Sergey Kryzhanovsky <skryzhanovsky@ya.ru> (https://github.com/afelix)",
   "maintainers": [
@@ -31,7 +31,7 @@
   },
   "devDependencies": {
     "browserify": "^13.0.0",
-    "jscs": "^2.6.0",
+    "jscs": "~2.9.0",
     "mocha": "~2.3.3",
     "uglify-js": "^2.6.1"
   },