diff --git a/appveyor.yml b/appveyor.yml
index 273eee2..d807b19 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -11,7 +11,7 @@ environment:
   matrix:
     - NIM_VERSION: 0.20.2
     - NIM_VERSION: 1.0.8
-    - NIM_VERSION: 1.2.6
+    - NIM_VERSION: 1.2.4
 
 for:
 -