diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 006a061..05d84fc 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -42,7 +42,8 @@ jobs:
       matrix:
         os:
           - ubuntu-22.04
-          - macos-12
+          - macos-12 # x86_64
+          - macos-14 # arm64
 
     name: build and test (os=${{ matrix.os }})
     runs-on: ${{ matrix.os }}
@@ -87,6 +88,10 @@ jobs:
 
       - name: Generate summary
         run: |
+          if [[ "$(uname -m)" == "arm64" ]]; then
+              echo "Skip on arm64 until the package is published" >&2
+              exit 0
+          fi
           ./devel/download-latest
           ./devel/diff-pkgs nextstrain-base-*.conda build/locked/*/nextstrain-base-*.conda \
             > "$GITHUB_STEP_SUMMARY"
diff --git a/README.md b/README.md
index 1ff86fe..0ad9ad0 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ To build this package locally, run:
 
 The final built package will be written to
 `build/locked/<arch>/nextstrain-base-*.conda`, where `<arch>` is a Conda
-subdir, e.g. `linux-64` or `osx-64`.
+subdir, i.e. `linux-64`, `osx-64` or `osx-arm64`.
 
 [CI][] builds store the entire `build/` and `locked/` directories as an
 artifact attached to each CI run.  You can download the artifacts to inspect
diff --git a/devel/build b/devel/build
index 2c4f866..198b17a 100755
--- a/devel/build
+++ b/devel/build
@@ -11,12 +11,6 @@ main() {
     export PATH="$env/bin:$PATH"
     export VERSION="${VERSION:-$(./devel/generate-version)}"
 
-    # Set CONDA_SUBDIR unless it's already set.  This helps macOS users on
-    # arm64 chips use and produce osx-64 Conda packages instead of osx-arm64
-    # packages (which we don't yet support).
-    CONDA_SUBDIR="${CONDA_SUBDIR:-$(./devel/conda-subdir)}"
-    export CONDA_SUBDIR
-
     clean
     build src
     lock
diff --git a/devel/conda-subdir b/devel/conda-subdir
index 1ea9037..52b51c0 100755
--- a/devel/conda-subdir
+++ b/devel/conda-subdir
@@ -15,7 +15,7 @@ case "$kernel/$machine" in
         echo "osx-64";;
 
     Darwin/arm64)
-        echo "osx-64";;
+        echo "osx-arm64";;
 
     *)
         echo "unsupported kernel/machine: $kernel/$machine" >&2
diff --git a/src/recipe.yaml b/src/recipe.yaml
index 45680d0..5eb7bce 100644
--- a/src/recipe.yaml
+++ b/src/recipe.yaml
@@ -46,6 +46,7 @@ requirements:
     - nextclade
     - nextstrain-cli
     - pathogen-embed
+    - pango_aliasor
 
     #
     # Third-party
@@ -73,12 +74,12 @@ requirements:
     - iqtree >=2
     - jq
     - ncbi-datasets-cli
-    - pango_aliasor
     - perl
-      # Pin pulp <2.8 for snakemake: https://github.com/snakemake/snakemake/issues/2607
+    # Pin pulp <2.8 for snakemake: https://github.com/snakemake/snakemake/issues/2607
     - pulp <2.8
     - ruby
     - seqkit
+    # TODO: We should avoid pinning too long, this pin was placed in 2023-12-21
     - snakemake <8
     - tsv-utils
     - unzip