diff --git a/.github/workflows/test-coverage.yml b/.github/workflows/test-coverage.yml
index 7668f1b..c7b05c4 100644
--- a/.github/workflows/test-coverage.yml
+++ b/.github/workflows/test-coverage.yml
@@ -20,7 +20,7 @@ jobs:
         cache: pip
         cache-dependency-path: pyproject.toml
     - name: Install SpatiaLite
-      run: sudo apt-get install libsqlite3-mod-spatialite
+      run: sudo apt-get update && sudo apt-get install -y libsqlite3-mod-spatialite
     - name: Install Python dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6c720a1..3832dd9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,18 +10,19 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15-dev"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
         numpy: [0, 1]
         os: [ubuntu-latest, macos-latest, windows-latest, macos-14]
     steps:
     - uses: actions/checkout@v7
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: ${{ matrix.python-version }}
         allow-prereleases: true
         cache: pip
         cache-dependency-path: pyproject.toml
+        check-latest: true
     - name: Install dependencies
       run: |
         pip install . --group dev
@@ -30,7 +31,7 @@ jobs:
       run: pip install numpy
     - name: Install SpatiaLite
       if: matrix.os == 'ubuntu-latest'
-      run: sudo apt-get install libsqlite3-mod-spatialite
+      run: sudo apt-get update && sudo apt-get install -y libsqlite3-mod-spatialite
     - name: Build extension for --load-extension test
       if: matrix.os == 'ubuntu-latest'
       run: |-
@@ -53,6 +54,11 @@ jobs:
       run: |
         pip install uv
         uv run ty check sqlite_utils
+    - name: Check no accidental dev= dependencies needed
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        pip install uv
+        uv run --no-default-groups sqlite-utils --help
     - name: Check formatting
       run: black . --check
     - name: Check if cog needs to be run
diff --git a/Justfile b/Justfile
index e93075f..7347534 100644
--- a/Justfile
+++ b/Justfile
@@ -2,9 +2,12 @@
 @default: test lint
 
 # Run pytest with supplied options
-@test *options:
+@test *options: test-no-dev-dependencies
   uv run pytest {{options}}
 
+@test-no-dev-dependencies:
+  uv run --isolated --no-default-groups sqlite-utils --help > /dev/null
+
 @run *options:
   uv run -- {{options}}
 
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 31bd961..5d024e1 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -4,6 +4,13 @@
  Changelog
 ===========
 
+.. _v4_2_1:
+
+4.2.1 (2026-08-13)
+------------------
+
+- Fix for ``No module named 'typing_extensions'`` crashing bug accidentally shipped in version 4.2. (:issue:`842`)
+
 .. _v4_2:
 
 4.2 (2026-08-13)
diff --git a/pyproject.toml b/pyproject.toml
index 6dac11c..92650e2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "sqlite-utils"
-version = "4.2"
+version = "4.2.1"
 description = "CLI tool and Python library for manipulating SQLite databases"
 readme = { file = "README.md", content-type = "text/markdown" }
 authors = [
diff --git a/sqlite_utils/db.py b/sqlite_utils/db.py
index 37825bb..c011d9b 100644
--- a/sqlite_utils/db.py
+++ b/sqlite_utils/db.py
@@ -24,8 +24,6 @@ from typing import (
 )
 
 from sqlite_fts4 import rank_bm25
-from typing_extensions import Self
-
 from sqlite_utils.plugins import ensure_plugins_loaded, pm
 
 from .create_table_parser import (
@@ -637,7 +635,7 @@ class Database:
             pm.hook.prepare_connection(conn=self.conn)
         self.strict = strict
 
-    def __enter__(self) -> Self:
+    def __enter__(self):
         return self
 
     def __exit__(