diff --git a/package-lock.json b/package-lock.json
index 6245aa93..65e2602e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "analyze-css",
-  "version": "2.4.50",
+  "version": "2.4.51",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "analyze-css",
-      "version": "2.4.50",
+      "version": "2.4.51",
       "license": "BSD-2-Clause",
       "dependencies": {
         "@adobe/css-tools": "^4.4.2",
diff --git a/package.json b/package.json
index 732946de..12f09286 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "analyze-css",
-  "version": "2.4.50",
+  "version": "2.4.51",
   "author": "Maciej Brencz <maciej.brencz@gmail.com> (https://github.com/macbre)",
   "description": "CSS selectors complexity and performance analyzer",
   "main": "./lib/index.js",
diff --git a/rules/prefixes.json b/rules/prefixes.json
index 3429d02b..340de3cc 100644
--- a/rules/prefixes.json
+++ b/rules/prefixes.json
@@ -1,5 +1,5 @@
 {
-  "generated": "Using autoprefixer v10.5.5",
+  "generated": "Using autoprefixer v10.6.0",
   "browsers": [
     "and_chr 151",
     "and_ff 153",
@@ -2386,6 +2386,22 @@
     "-o-color-adjust": {
       "keep": true,
       "msg": "required by Opera Mobile 80 and later"
+    },
+    "-ms-initial-letter": {
+      "keep": false,
+      "msg": "prefix is no longer supported"
+    },
+    "-webkit-initial-letter": {
+      "keep": true,
+      "msg": "required by Safari 26.5, Safari on iOS 18.5 and later"
+    },
+    "-moz-initial-letter": {
+      "keep": false,
+      "msg": "prefix is no longer supported"
+    },
+    "-o-initial-letter": {
+      "keep": false,
+      "msg": "prefix is no longer supported"
     }
   }
 }
\ No newline at end of file