diff --git a/.changeset/clever-cats-brush.md b/.changeset/clever-cats-brush.md
new file mode 100644
index 00000000..ca366265
--- /dev/null
+++ b/.changeset/clever-cats-brush.md
@@ -0,0 +1,5 @@
+---
+'highlightjs-glimmer': patch
+---
+
+Declare support for Node 20
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9ce13ebe..12c8e01d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,6 +51,7 @@ jobs:
           - "14"
           - "16"
           - "18"
+          - "20"
     steps:
       - uses: actions/checkout@v4
       - uses: felixmosh/turborepo-gh-artifacts@v2
@@ -72,6 +73,7 @@ jobs:
           - "14"
           - "16"
           - "18"
+          - "20"
     steps:
       - uses: actions/checkout@v4
       - uses: felixmosh/turborepo-gh-artifacts@v2
diff --git a/highlightjs-glimmer/package.json b/highlightjs-glimmer/package.json
index e90c74f0..61c69a3e 100644
--- a/highlightjs-glimmer/package.json
+++ b/highlightjs-glimmer/package.json
@@ -26,7 +26,7 @@
     "lint:prettier:fix": "prettier --write ."
   },
   "engines": {
-    "node": "^14 || ^16 || ^18"
+    "node": "^14 || ^16 || ^18 || >= 20"
   },
   "devDependencies": {
     "@babel/core": "^7.23.3",