diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fb68b8971f8f0712d8c091c234dcafbbb66e0746..07d14a8bac2f1bdb46a69cc9b09c493e6e15e8e4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,5 @@
 # make sure to pin image tag for ease of reproducibility
-image: continuumio/miniconda3 # continuumio/miniconda3:4.9.2
+image: continuumio/miniconda3:4.9.2
 # image: mambaorg/micromamba
 
 variables:
@@ -69,8 +69,7 @@ workflow:
     - mkdir -p ${CONDA_ENVS}
     - conda config --prepend envs_dirs ${CONDA_ENVS}
     - conda update -n base conda &&
-#    - conda install 'mamba<=1.4.5' -n base -c conda-forge &&
-    - conda install mamba -n base -c conda-forge &&
+    - conda install 'mamba<=1.4.5' -n base -c conda-forge &&
     - conda update mamba -n base -c conda-forge
 
 .conda_setup: &conda_setup
@@ -187,8 +186,7 @@ docs:
 
         # libenchant is needed for sphinxcontrib.spelling by way of PyEnchant,
         # and is not easily installed via conda
-        # - apt-get update --allow-releaseinfo-change && apt-get install -yqq libenchant-dev
-        - conda install libenchant-dev
+        - apt-get update --allow-releaseinfo-change && apt-get install -yqq libenchant-dev
     script:
         - cd docs/
         - make html