diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2da841fd..9332f50b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.12.2 2025-09-22
+
+- remove unused dependencies
+  - acorn
+
 ## 0.12.1 2025-09-18
 
 - removed unused dependency 'glob'
diff --git a/package-lock.json b/package-lock.json
index 31b122ee..4c46453e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,7 +15,6 @@
         "@ts-common/json-parser": "^0.9.0",
         "@ts-common/source-map": "^0.5.0",
         "@ts-common/string-map": "^0.3.0",
-        "acorn": "^5.7.4",
         "autorest": "^3.6.1",
         "js-yaml": "^3.13.1",
         "json-pointer": "^0.6.2",
@@ -1758,18 +1757,6 @@
       "dev": true,
       "license": "ISC"
     },
-    "node_modules/acorn": {
-      "version": "5.7.4",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
-      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==",
-      "license": "MIT",
-      "bin": {
-        "acorn": "bin/acorn"
-      },
-      "engines": {
-        "node": ">=0.4.0"
-      }
-    },
     "node_modules/ajv": {
       "version": "6.12.6",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
diff --git a/package.json b/package.json
index a18e604e..c7548878 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,6 @@
     "@ts-common/json-parser": "^0.9.0",
     "@ts-common/source-map": "^0.5.0",
     "@ts-common/string-map": "^0.3.0",
-    "acorn": "^5.7.4",
     "autorest": "^3.6.1",
     "js-yaml": "^3.13.1",
     "json-pointer": "^0.6.2",