diff --git a/CHANGELOG.md b/CHANGELOG.md
index 363b41c..26edc23 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 6.3.1 (2024-11-26)
+
+### Bug fixes
+
+When completing a property name, insert a colon and space after the name.
+
 ## 6.3.0 (2024-09-07)
 
 ### New features
diff --git a/package.json b/package.json
index dcdd572..a8acffc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@codemirror/lang-css",
-  "version": "6.3.0",
+  "version": "6.3.1",
   "description": "CSS language support for the CodeMirror code editor",
   "scripts": {
     "test": "cm-runtests",
diff --git a/src/complete.ts b/src/complete.ts
index e9e759b..7310bb5 100644
--- a/src/complete.ts
+++ b/src/complete.ts
@@ -16,7 +16,7 @@ function properties() {
         }
       }
     }
-    _properties = names.sort().map(name => ({type: "property", label: name}))
+    _properties = names.sort().map(name => ({type: "property", label: name, apply: name + ": "}))
   }
   return _properties || []
 }