diff --git a/.circleci/config.yml b/.circleci/config.yml
index d66aeb3..9ba335a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -11,6 +11,11 @@ jobs:
                   POSTGRES_HOST_AUTH_METHOD: trust
                   POSTGRES_DB: keg_tests
                   PGPORT: 54321
+            - image: mcr.microsoft.com/mssql/server
+              environment:
+                ACCEPT_EULA: Y
+                MSSQL_SA_PASSWORD: "Password12!"
+                MSSQL_TCP_PORT: 14331
         steps:
             - checkout
 
diff --git a/docker-compose.yaml b/docker-compose.yaml
index a54fab5..1f4d662 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -11,13 +11,21 @@
 # - `docker stop $(docker ps -aq)`: stop all running containers
 # - `docker rm $(docker ps -a -q)`: remove all stopped containers
 
-version: '2'
+version: '2.1'
 services:
+  keg-mssql:
+      image: mcr.microsoft.com/mssql/server
+      container_name: keg-mssql
+      ports:
+        - '${KEG_LIB_MSSQL_IP:-127.0.0.1}:${KEG_LIB_MSSQL_PORT:-14331}:1433'
+      environment:
+        ACCEPT_EULA: Y
+        MSSQL_SA_PASSWORD: "Password12!"
   keg-pg:
       image: postgres:13-alpine
       container_name: keg-pg
       ports:
-        - '127.0.0.1:54321:5432'
+        - '${KEG_LIB_POSTGRES_IP:-127.0.0.1}:${KEG_LIB_POSTGRES_PORT:-54321}:5432'
       environment:
         # Ok for local dev, potentially UNSAFE in other applications.  Don't blindly copy & paste
         # without considering implications.
diff --git a/keg_apps/db/config.py b/keg_apps/db/config.py
index 4c83f0f..a65162e 100644
--- a/keg_apps/db/config.py
+++ b/keg_apps/db/config.py
@@ -22,5 +22,7 @@ class TestProfile(object):
         # This string will connect to the postgresql DB setup in docker-compose.yaml and
         # work in CircleCI.
         'postgres': 'postgresql://postgres@127.0.0.1:54321/postgres',
+        'mssql': 'mssql+pyodbc_mssql://sa:Password12!@127.0.0.1:14331/tempdb'
+        '?driver=ODBC+Driver+17+for+SQL+Server',
         'sqlite2': 'sqlite:///'
     }
diff --git a/setup.py b/setup.py
index 76ef5b6..fc82e7f 100644
--- a/setup.py
+++ b/setup.py
@@ -48,7 +48,8 @@
         'tests': [
             'flask-webtest',
             'flask-wtf',
-            "sqlalchemy_pyodbc_mssql; sys_platform == 'win32'",
+            'sqlalchemy_pyodbc_mssql',
+            'pyodbc==4.0.34',
             'pytest',
             'pytest-cov',
             'python-dotenv',
diff --git a/stable-requirements.txt b/stable-requirements.txt
new file mode 100644
index 0000000..02d15d6
--- /dev/null
+++ b/stable-requirements.txt
@@ -0,0 +1,40 @@
+appdirs==1.4.4
+attrs==22.1.0
+beautifulsoup4==4.11.1
+BlazeUtils==0.6.5
+blinker==1.5
+click==8.1.3
+coverage==6.5.0
+Flask==2.2.2
+Flask-SQLAlchemy==3.0.2
+Flask-WebTest==0.0.9
+Flask-WTF==1.0.1
+greenlet==1.1.3.post0
+importlib-metadata==5.0.0
+iniconfig==1.1.1
+itsdangerous==2.1.2
+Jinja2==3.1.2
+MarkupSafe==2.1.1
+mock==4.0.3
+packaging==21.3
+pluggy==1.0.0
+psycopg2-binary==2.9.4
+py==1.11.0
+pyodbc==4.0.34
+pyparsing==3.0.9
+pytest==7.1.3
+pytest-cov==4.0.0
+python-dotenv==0.21.0
+python-json-logger==2.0.4
+six==1.16.0
+soupsieve==2.3.2.post1
+SQLAlchemy==1.4.42
+sqlalchemy-pyodbc-mssql==0.1.1
+tomli==2.0.1
+waitress==2.1.2
+WebOb==1.8.7
+WebTest==3.0.0
+Werkzeug==2.2.2
+wrapt==1.14.1
+WTForms==3.0.1
+zipp==3.10.0
diff --git a/tox.ini b/tox.ini
index 07a4134..cd4e226 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py{37,38,39},py37-{lowest,i18n},py39-{lowest,i18n},project,docs,i18n
+envlist = py{37,38,39}-{base,stable},py37-{lowest,i18n},py39-{lowest,i18n},project,docs,i18n
 
 
 [testenv]
@@ -17,6 +17,7 @@ recreate=True
 commands =
     pip --version
     lowest: pip install flask<2 markupsafe~=2.0.0
+    stable: pip install --progress-bar off -r ./stable-requirements.txt
     pip install --progress-bar off .[tests]
     i18n: pip install --progress-bar off .[i18n]
     # Output installed versions to compare with previous test runs in case a dependency's change