diff --git a/History.md b/History.md
index fb7e7ef..5cbdfa9 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,18 @@
+[5.6.3 / 2023-11-30](https://github.com/clean-css/clean-css-cli/compare/v5.6.2...v5.6.3)
+==================
+
+* Bumps clean-css dependency to 5.3.3
+
+[5.6.2 / 2023-01-19](https://github.com/clean-css/clean-css-cli/compare/v5.6.1...v5.6.2)
+==================
+
+* Bumps clean-css dependency to 5.3.2
+
+[5.6.1 / 2022-07-13](https://github.com/clean-css/clean-css-cli/compare/v5.6.0...v5.6.1)
+==================
+
+* Bumps clean-css dependency to 5.3.1.
+
 [5.6.0 / 2022-03-31](https://github.com/clean-css/clean-css-cli/compare/v5.5.2...v5.6.0)
 ==================
 
diff --git a/package-lock.json b/package-lock.json
index 76997f4..9225404 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "clean-css-cli",
-  "version": "5.6.0",
+  "version": "5.6.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -56,9 +56,9 @@
       }
     },
     "clean-css": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.3.0.tgz",
-      "integrity": "sha512-YYuuxv4H/iNb1Z/5IbMRoxgrzjWGhOEFfd+groZ5dMCVkpENiMZmwspdrzBo9286JjM1gZJPAyL7ZIdzuvu2AQ==",
+      "version": "5.3.3",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.3.3.tgz",
+      "integrity": "sha512-D5J+kHaVb/wKSFcyyV75uCn8fiY4sV38XJoe4CUyGQ+mOU/fMVYUdH1hJC+CJQ5uY3EnW27SbJYS4X8BiLrAFg==",
       "requires": {
         "source-map": "~0.6.0"
       },
diff --git a/package.json b/package.json
index f26fff8..43f5572 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "clean-css-cli",
-  "version": "5.6.0",
+  "version": "5.6.3",
   "description": "A command-line interface to clean-css CSS optimization library",
   "scripts": {
     "check": "jshint ./bin/cleancss .",
@@ -35,7 +35,7 @@
   "homepage": "https://github.com/clean-css/clean-css-cli#readme",
   "dependencies": {
     "chokidar": "^3.5.2",
-    "clean-css": "^5.3.0",
+    "clean-css": "^5.3.3",
     "commander": "7.x",
     "glob": "^7.1.6"
   },
diff --git a/test/fixtures/unsupported/selectors-ie7.css b/test/fixtures/unsupported/selectors-ie7.css
index 29350f2..d43708e 100644
--- a/test/fixtures/unsupported/selectors-ie7.css
+++ b/test/fixtures/unsupported/selectors-ie7.css
@@ -3,14 +3,14 @@ p:before{top:0}
 p:after{top:0}
 p:root{top:0}
 p:first-of-type{top:0}
-p:nth-last-of-type(1){top:0}
+p:last-of-type{top:0}
 p:first-of-type{top:0}
 p:last-of-type{top:0}
 p:only-of-type{top:0}
 p:only-child{top:0}
 p:last-child{top:0}
 p:first-child{top:0}
-p:nth-last-child(1){top:0}
+p:last-child{top:0}
 p:empty{top:0}
 p:target{top:0}
 p:checked{top:0}
diff --git a/test/fixtures/unsupported/selectors-ie8.css b/test/fixtures/unsupported/selectors-ie8.css
index 94df693..fb8a104 100644
--- a/test/fixtures/unsupported/selectors-ie8.css
+++ b/test/fixtures/unsupported/selectors-ie8.css
@@ -1,13 +1,13 @@
 p:root{top:0}
 p:first-of-type{top:0}
-p:nth-last-of-type(1){top:0}
+p:last-of-type{top:0}
 p:first-of-type{top:0}
 p:last-of-type{top:0}
 p:only-of-type{top:0}
 p:only-child{top:0}
 p:last-child{top:0}
 p:first-child{top:0}
-p:nth-last-child(1){top:0}
+p:last-child{top:0}
 p:empty{top:0}
 p:target{top:0}
 p:checked{top:0}