diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c00baceb..9f1b697f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -83,7 +83,7 @@ jobs:
           RUST_TEST_THREADS: 1
     services:
       smtp4dev:
-        image: rnwood/smtp4dev:3.14.0
+        image: rnwood/smtp4dev:3.15.0
         env:
           ServerOptions__AuthenticationRequired: "true"
           ServerOptions__Users__0__Username: academy