diff --git a/.fixtures.yml b/.fixtures.yml
index e46a078..43031de 100644
--- a/.fixtures.yml
+++ b/.fixtures.yml
@@ -1,7 +1,9 @@
 ---
 fixtures:
   repositories:
-    gdm: https://github.com/simp/pupmod-simp-gdm
+    gdm:
+      repo: https://github.com/simp/pupmod-simp-gdm
+      ref: 7.0.3
     simplib: https://github.com/simp/pupmod-simp-simplib
     stdlib: https://github.com/simp/puppetlabs-stdlib
     xinetd: https://github.com/simp/pupmod-simp-xinetd