diff --git a/.github/workflows/mkdocs.yml b/.github/workflows/mkdocs.yml
index 66d2c18a8..9725aa562 100644
--- a/.github/workflows/mkdocs.yml
+++ b/.github/workflows/mkdocs.yml
@@ -4,10 +4,19 @@ on:
     branches:
       - main
 
+# Default to bash in login mode; key to activating conda environment
+# https://github.com/mamba-org/provision-with-micromamba#IMPORTANT
+defaults:
+  run:
+    shell: "bash -l {0}"
+
 permissions:
   contents: write
   pages: write
 
+env:
+  MICROMAMBA_VERSION: 'latest'
+
 jobs:
   build:
     name: Deploy docs
@@ -19,19 +28,15 @@ jobs:
           submodules: "recursive"
           fetch-depth: 0       # Fetch all history for .GitInfo and .Lastmod
 
-      - name: Setup Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.9'
-          architecture: 'x64'
       - name: Install dependencies
-        run: |
-          python3 -m pip install --upgrade pip            # install pip
-          python3 -m pip install -r requirements-dev.txt  # install dev deps
+        uses: "mamba-org/setup-micromamba@v1"
+        with:
+          micromamba-version: "${{ env.MICROMAMBA_VERSION }}"
+          environment-file: "environments/dev-environment.yaml"
+          cache-environment: true
 
       - name: Install conda-lock
-        run: |
-          python3 -m pip install .
+        run: "pip install ."
 
       - name: Build site
         run: mkdocs build
@@ -42,4 +47,4 @@ jobs:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./site
           user_name: 'github-actions[bot]'
-          user_email: 'github-actions[bot]@users.noreply.github.com'
\ No newline at end of file
+          user_email: 'github-actions[bot]@users.noreply.github.com'
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e0f762dc1..7a20c8aec 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -31,18 +31,10 @@ jobs:
         uses: mamba-org/setup-micromamba@v1
         with:
           micromamba-version: ${{ env.MICROMAMBA_VERSION }}
-          environment-name: test-env
+          environment-file: environments/dev-environment.yaml
           init-shell: powershell
           create-args: >-
             python=3.11
-            mamba
-            pip
-            pytest-cov
-            pytest-xdist
-
-      - name: Install dev deps
-        run: |
-          python -m pip install -r requirements-dev.txt
 
       - name: install conda-lock
         run: |
@@ -78,23 +70,10 @@ jobs:
       - uses: mamba-org/setup-micromamba@v1
         with:
           micromamba-version: ${{ env.MICROMAMBA_VERSION }}
-          environment-name: test-env
+          environment-file: environments/dev-environment.yaml
           init-shell: bash
           create-args: >-
             python=${{ matrix.python-version }}
-            mamba
-            pip
-            pytest-cov
-            pytest-xdist
-
-      - name: Install dev deps
-        shell: bash -eo pipefail -l {0}
-        run: |
-          set -x
-          echo "${PATH}"
-          which pip
-          which python
-          python -m pip install -r requirements-dev.txt
 
       - name: install conda-lock
         shell: bash -eo pipefail -l {0}
diff --git a/environments/README.md b/environments/README.md
index 42622dfba..77ae95ea6 100644
--- a/environments/README.md
+++ b/environments/README.md
@@ -7,12 +7,6 @@
   mamba activate conda-lock-dev
   ```
 
-  or:
-
-  ```
-  pip install requirements-dev.txt
-  ```
-
 * Then, install `conda-lock` in editable mode. This will also install its runtime
   dependencies as defined in `pyproject.toml`.
 
diff --git a/environments/dev-environment.yaml b/environments/dev-environment.yaml
index bee5b5a24..43aa45072 100644
--- a/environments/dev-environment.yaml
+++ b/environments/dev-environment.yaml
@@ -4,6 +4,7 @@ channels:
 - conda-forge
 - nodefaults
 dependencies:
+- mamba
 - black
 - check-manifest
 - doctr
diff --git a/requirements-dev.txt b/requirements-dev.txt
deleted file mode 100644
index b4feceec3..000000000
--- a/requirements-dev.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-black
-check-manifest
-doctr
-build
-freezegun
-mypy
-pre_commit
-pytest
-pytest-cov
-pytest-xdist
-pytest-timeout
-tomli; python_version<"3.11"
-twine
-wheel
-mkdocs
-mkdocs-material
-mkdocs-click
-mkdocs-include-markdown-plugin
-flaky
-docker