diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index fbfbf19..fab91b5 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -14,14 +14,18 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9"]
+        python-version: ["3.8", "3.9"]
         sphinx-version: [
-          "",
+          "6.0.*",
           "5.0.*",
           "4.5", "4.4", "4.3", "4.2", "4.1", "4.0.*",
           "3.5.*", "3.4.*", "3.2.*",  "3.1.*", "3.0.*",
         ]
         include:
+          - python-version: "3.7"
+            sphinx-version: ""
+          - python-version: "3.7"
+            sphinx-version: "3.5"
           - python-version: "3.10"
             sphinx-version: ""
           - python-version: "3.10"
diff --git a/pyproject.toml b/pyproject.toml
index 14a34f4..2149c97 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ classifiers = [
 
 requires-python = '>= 3.7'
 dependencies = [
-    'Sphinx >= 2.2, < 6.0',
+    'Sphinx >= 2.2, < 7.0',
 ]
 
 [tool.setuptools]