diff --git a/.changeset/late-boxes-behave.md b/.changeset/late-boxes-behave.md
new file mode 100644
index 0000000..f643d00
--- /dev/null
+++ b/.changeset/late-boxes-behave.md
@@ -0,0 +1,5 @@
+---
+"@marko/express": patch
+---
+
+Bump Marko peerDependency range.
diff --git a/package-lock.json b/package-lock.json
index bbaee81..3c53c1f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,7 +41,7 @@
       },
       "peerDependencies": {
         "express": "^4 || ^5",
-        "marko": "^4 || ^5"
+        "marko": "4 - 6"
       }
     },
     "node_modules/@ampproject/remapping": {
diff --git a/package.json b/package.json
index 211b56a..99237d1 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
   "module": "./dist/index.mjs",
   "peerDependencies": {
     "express": "^4 || ^5",
-    "marko": "^4 || ^5"
+    "marko": "4 - 6"
   },
   "repository": {
     "type": "git",