diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 158206ca4..cfc5b401d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -114,6 +114,4 @@ jobs:
         shell: nix develop .#ci -c bash -e {0}
         run: |
           cd cbmc/proofs;
-          KYBER_K=2 ./run-cbmc-proofs.py --summarize -j1 --verbose --debug;
           KYBER_K=3 ./run-cbmc-proofs.py --summarize -j1 --verbose --debug;
-          KYBER_K=4 ./run-cbmc-proofs.py --summarize -j1 --verbose --debug;