diff --git a/bob/devtools/data/gitlab-ci/noarch.yaml b/bob/devtools/data/gitlab-ci/noarch.yaml
index 280e119e04e3d69b97bd09afe82ba833e56ee64c..73a075c5e6a9b167ffe9aa1dca356f3eb378d207 100644
--- a/bob/devtools/data/gitlab-ci/noarch.yaml
+++ b/bob/devtools/data/gitlab-ci/noarch.yaml
@@ -27,8 +27,8 @@ stages:
     - source ${CONDA_ROOT}/etc/profile.d/conda.sh
     # for conda inspect during builds (on macos)
     - conda activate base
-    - mamba install -n base conda-build
     - bdt ci check -vv
+    - conda clean --all
   cache:
     paths:
       - miniconda.sh
diff --git a/bob/devtools/data/gitlab-ci/single-package.yaml b/bob/devtools/data/gitlab-ci/single-package.yaml
index f2566bcb48cf2388009abe907c92f5f0a82ddeef..5759d986447d27b4d84d9bba10cdce64fc2a5c88 100644
--- a/bob/devtools/data/gitlab-ci/single-package.yaml
+++ b/bob/devtools/data/gitlab-ci/single-package.yaml
@@ -27,8 +27,8 @@ stages:
     - source ${CONDA_ROOT}/etc/profile.d/conda.sh
     # for conda inspect during builds (on macos)
     - conda activate base
-    - mamba install -n base conda-build
     - bdt ci check -vv
+    - conda clean --all
   cache:
     paths:
       - miniconda.sh