diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 945b9f7..f36d9fb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-latest, ubuntu-18.04, macos-latest]
-        nim-version: ['1.6.0']
+        nim-version: ['1.4.2']
         include:
           - os: ubuntu-latest
             nim-version: devel