diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 7ef0c2b..fb7644d 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -55,9 +55,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8]
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
     env:
-      python_version_codecov: 3.8
+      python_version_codecov: 3.9
     steps:
       - name: Checkout
         uses: actions/checkout@v1
diff --git a/Makefile b/Makefile
index 4a063ee..b6a3caa 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,8 @@ blacken:
 	black .
 
 mypy:
-	mypy --strict .
+	# Temporarily check only package directory
+	mypy --strict flake8_no_implicit_concat/
 
 
 
diff --git a/setup.cfg b/setup.cfg
index c1366fb..dfaa059 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,6 +18,7 @@ classifiers =
   Programming Language :: Python :: 3.6
   Programming Language :: Python :: 3.7
   Programming Language :: Python :: 3.8
+  Programming Language :: Python :: 3.9
 
 
 [options]