diff --git a/build/README.md b/build/README.md
index 3c09035b..2a07537f 100644
--- a/build/README.md
+++ b/build/README.md
@@ -32,7 +32,7 @@ To change the options, either edit the YAML files directly or add additional `--
 Note: currently, **Windows is not supported**.
 
 The Manubot environment is managed with [conda](https://conda.io).
-If you do not have `conda` installed, we recommend using the Miniforge3 (includes `conda`) or Mambaforge (includes `conda` and `mamba`) installers from [miniforge](https://github.com/conda-forge/miniforge).
+If you do not have `conda` installed, we recommend using the Miniforge3 installer from [miniforge](https://github.com/conda-forge/miniforge) (includes `conda` and `mamba`).
 Install the environment from [`environment.yml`](environment.yml) by running one of following commands
 (from the repository's root directory):
 
diff --git a/ci/install-spellcheck.sh b/ci/install-spellcheck.sh
index e12661ec..44431415 100755
--- a/ci/install-spellcheck.sh
+++ b/ci/install-spellcheck.sh
@@ -6,7 +6,8 @@
 set -o errexit \
     -o pipefail
 
-sudo apt-get update --yes
+# --allow-releaseinfo-change for error on appveyor like "Repository ... changed its 'Label' value"
+sudo apt-get update --yes --allow-releaseinfo-change
 sudo apt-get install --yes aspell aspell-en
 wget --directory-prefix=build/pandoc/filters \
   https://github.com/pandoc/lua-filters/raw/13c3fa7e97206413609a48a82575cb43137e037f/spellcheck/spellcheck.lua
diff --git a/ci/install.sh b/ci/install.sh
index 6b20f0e1..12e516ce 100755
--- a/ci/install.sh
+++ b/ci/install.sh
@@ -7,7 +7,7 @@
 set -o errexit \
     -o pipefail
 
-wget https://github.com/conda-forge/miniforge/releases/latest/download/Mambaforge-$(uname)-$(uname -m).sh \
+wget https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-$(uname)-$(uname -m).sh \
   --output-document miniforge.sh
 bash miniforge.sh -b -p $HOME/miniconda
 source $HOME/miniconda/etc/profile.d/conda.sh