diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 73751ef..004a2a8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [18.18.0, 20.9.0, 22, 24]
+        node-version: [20.9.0, 22, 24]
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
diff --git a/README.md b/README.md
index c1d998c..413aa60 100644
--- a/README.md
+++ b/README.md
@@ -144,8 +144,8 @@ MIT © [Roger Chappel](https://github.com/rogerchappel)
 
 ## Development
 
-Typegap supports Node.js 18.18+, 20.9+, and 22 or newer. Node.js 19 and 21
-are not supported because the shipped runtime dependency set does not support
+Typegap supports Node.js 20.9+ and 22 or newer. Node.js 21
+is not supported because the shipped runtime dependency set does not support
 those releases.
 
 Run the same release gate used by CI before opening a PR:
diff --git a/package-lock.json b/package-lock.json
index 5cb27c1..ea68ae5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,7 +29,7 @@
         "vitest": "^3.0.0"
       },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=22.0.0"
+        "node": "^20.9.0 || >=22.0.0"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -605,24 +605,6 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
-    "node_modules/@eslint/config-array/node_modules/balanced-match": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
-      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/@eslint/config-array/node_modules/brace-expansion": {
-      "version": "1.1.16",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.16.tgz",
-      "integrity": "sha512-IDw48K2/2kRkg9LdJxurvq3lV3aBgq0REY89duEqFRthjlPdXHKMj7EnQOXVckxzgisinf3nHfrcE2FufFLXMw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
     "node_modules/@eslint/config-array/node_modules/minimatch": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.5.tgz",
@@ -686,24 +668,6 @@
         "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/@eslint/eslintrc/node_modules/balanced-match": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
-      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/@eslint/eslintrc/node_modules/brace-expansion": {
-      "version": "1.1.16",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.16.tgz",
-      "integrity": "sha512-IDw48K2/2kRkg9LdJxurvq3lV3aBgq0REY89duEqFRthjlPdXHKMj7EnQOXVckxzgisinf3nHfrcE2FufFLXMw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
     "node_modules/@eslint/eslintrc/node_modules/minimatch": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.5.tgz",
@@ -1769,15 +1733,15 @@
       }
     },
     "node_modules/brace-expansion": {
-      "version": "5.0.7",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.7.tgz",
-      "integrity": "sha512-7oFy703dxfY3/NLxC1fh2SUCQ0H9rmAY+5EpDVfXjUTTs+HEwR2nYaqLv+GWcTsumwxPfiz6CzCNkwXwBUwqCA==",
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.8.tgz",
+      "integrity": "sha512-JZyDyq3D4AUifKTPOB7DELf6XsB3WdPuNxCtob1vFXPsSXhdAiHBWJ/tJ8HAc9aH84BK+5JFZLNkJKx3G9kzQg==",
       "license": "MIT",
       "dependencies": {
         "balanced-match": "^4.0.2"
       },
       "engines": {
-        "node": "18 || 20 || >=22"
+        "node": "20 || >=22"
       }
     },
     "node_modules/cac": {
@@ -1873,13 +1837,6 @@
         "node": ">=18"
       }
     },
-    "node_modules/concat-map": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
@@ -2080,24 +2037,6 @@
         "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/eslint/node_modules/balanced-match": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
-      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/eslint/node_modules/brace-expansion": {
-      "version": "1.1.16",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.16.tgz",
-      "integrity": "sha512-IDw48K2/2kRkg9LdJxurvq3lV3aBgq0REY89duEqFRthjlPdXHKMj7EnQOXVckxzgisinf3nHfrcE2FufFLXMw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
     "node_modules/eslint/node_modules/eslint-visitor-keys": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.1.tgz",
diff --git a/package.json b/package.json
index 9ace9dc..ddfab96 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
   },
   "homepage": "https://github.com/rogerchappel/typegap#readme",
   "engines": {
-    "node": "^18.18.0 || ^20.9.0 || >=22.0.0"
+    "node": "^20.9.0 || >=22.0.0"
   },
   "dependencies": {
     "@typescript-eslint/typescript-estree": "^8.0.0",
@@ -65,7 +65,8 @@
     "picocolors": "^1.0.0"
   },
   "overrides": {
-    "glob": "$glob"
+    "glob": "$glob",
+    "brace-expansion": "5.0.8"
   },
   "devDependencies": {
     "@eslint/js": "^9.0.0",