diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index eb22b4d..baab55a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,16 +27,22 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.8', '3.9', '3.10', '3.11']
 
     steps:
       - uses: actions/checkout@v4
-      - uses: conda-incubator/setup-miniconda@v2
+      - uses: mamba-org/setup-micromamba@v1
         with:
-          auto-update-conda: false
-          python-version: ${{ matrix.python-version }}
-          channels: conda-forge,nodefaults
-          miniforge-variant: Mambaforge
+          environment-name: gha-testing
+          condarc: |
+            channels:
+              - nodefaults
+              - conda-forge
+          create-args: >-
+            python=${{ matrix.python-version }}
+            mamba
+            tox-conda
+          cache-environment: true
 
       - name: Install core dependencies.
         shell: bash -l {0}
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a07d792..2c1b63f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -27,7 +27,7 @@ repos:
     rev: v3.11.0
     hooks:
     -   id: reorder-python-imports
-        args: [--py37-plus, --add-import, 'from __future__ import annotations']
+        args: [--py38-plus, --add-import, 'from __future__ import annotations']
 -   repo: https://github.com/asottile/setup-cfg-fmt
     rev: v2.4.0
     hooks:
diff --git a/CHANGES.md b/CHANGES.md
index 5aa58d3..98490fe 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,10 @@ chronological order. Releases follow [semantic versioning](https://semver.org/)
 releases are available on [PyPI](https://pypi.org/project/pytask-parallel) and
 [Anaconda.org](https://anaconda.org/conda-forge/pytask-parallel).
 
+## 0.4.0 - 2023-xx-xx
+
+- {pull}`62` deprecates Python 3.7.
+
 ## 0.3.1 - 2023-05-27
 
 - {pull}`56` refactors the `ProcessPoolExecutor`.
diff --git a/pyproject.toml b/pyproject.toml
index 24f0479..71ea451 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ ignore_errors = true
 
 
 [tool.ruff]
-target-version = "py37"
+target-version = "py38"
 select = ["ALL"]
 fix = true
 extend-ignore = [