diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 2fe5015..ad04a3f 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.6.15", "3.9.18", "3.10.13", "3.12.1" ]
+        python-version: [ "3.9.18", "3.10.13", "3.12.1" ]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/MANIFEST.in b/MANIFEST.in
index 6bf1cf4..d6435fc 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,9 @@
 include tox.ini
 include pytest.ini
 include Makefile
+include .idea/httpd-echo.iml
+include .idea/inspectionProfiles/Project_Default.xml
+include .idea/inspectionProfiles/profiles_settings.xml
+include .idea/misc.xml
+include .idea/modules.xml
+include .idea/vcs.xml
diff --git a/tox.ini b/tox.ini
index 40a9f18..a437d0e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py3{6,7,8,9,10,11},pypy3
+envlist = py3{6,7,8,9,10,11},pypy3.9
 # At least this version is needed for PEP 517/518 support.
 minversion = 3.3.0
 # Activate isolated build environment. tox will use a virtual environment