diff --git a/tox.ini b/tox.ini
index a731af499a1c62ac9856f76daab6e3093b2d2264..472ee1aff50cb6f7eb65bf775c1bd8876ebf3b70 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,8 +5,8 @@ skipsdist = true
 [testenv]
 passenv = TOXENV
 commands =
-    py{36,37,38,39}: pip install -e '.[dev,sqlite,redis]'
-    py{37,38,39}-uvloop: pip install -e '.[dev,sqlite,redis,uvloop]'
+    py{37,38,39}: pip install -e '.[dev,sqlite,redis,postgres]'
+    py{37,38,39}-uvloop: pip install -e '.[dev,sqlite,redis,postgres,uvloop]'
     pytest .
 
 [testenv:lint]
@@ -19,6 +19,6 @@ commands =
 passenv = TOXENV
 basepython = python3.9
 commands =
-    pip install -e ".[dev,sqlite,redis]"
+    pip install -e ".[dev,sqlite,redis,postgres]"
     pytest --cov . --cov-append --cov-report= .
     coverage report --fail-under=97 --include="postfix_mta_sts_resolver/*" --show-missing