diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
index 7f17b150e84..fee57045332 100644
--- a/.github/workflows/benchmarks.yml
+++ b/.github/workflows/benchmarks.yml
@@ -76,6 +76,7 @@ jobs:
             python
             asv=0.6.4
             mamba
+            libmambapy<2.0
             conda-build
             conda=24.11.0