diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2bd893add..00ba11e5e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  NPROC: 2
+  NPROC: 1
   MAKEFLAGS: "-j${NPROC}"
   NIMFLAGS: "--parallelBuild:${NPROC} --colors:off -d:chronicles_colors:none"