diff --git a/README.md b/README.md
index dea3c71..c743e1b 100644
--- a/README.md
+++ b/README.md
@@ -13,5 +13,5 @@ Optionally, you can specify the desired Doxygen version
 ```
   - uses: ssciwr/doxygen-install@v1
     with:
-      version: 1.9.5
+      version: "1.9.5"
 ```