diff --git a/spack.yaml b/spack.yaml
index b884ecbe1f56d490c4a5451ed69cc22a1a2bdb4a..d25acda10da06264da07bc85fa484101178fd115 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -1,8 +1,5 @@
 spack:
   specs:
-    # system
-    - autoconf@2.70 %gcc@10.3.0
-    - which %gcc@10.3.0
     # Notebook
     - py-jupyter %gcc@10.3.0
     - py-ipython %gcc@10.3.0