diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index d593fd0..9e2d881 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v3
diff --git a/README.md b/README.md
index f083dd0..e21f534 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ For performance critical 64 bit applications, a simplified version of memory map
 
 ## Prerequisites
 
-* Python 3.6+
+* Python 3.7+
 * OSX, Windows or Linux
 
 The package was tested on all of the previously mentioned configurations.
diff --git a/doc/source/intro.rst b/doc/source/intro.rst
index 3489b04..109fec2 100644
--- a/doc/source/intro.rst
+++ b/doc/source/intro.rst
@@ -20,7 +20,7 @@ For performance critical 64 bit applications, a simplified version of memory map
 #############
 Prerequisites
 #############
-* Python 3.6+
+* Python 3.7+
 * OSX, Windows or Linux
 
 The package was tested on all of the previously mentioned configurations.
diff --git a/setup.py b/setup.py
index 9ab8a7f..1df3b62 100755
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@
     license="BSD",
     packages=find_packages(),
     zip_safe=True,
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Environment :: Console",
@@ -38,7 +38,6 @@
         "Operating System :: MacOS :: MacOS X",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
diff --git a/smmap/buf.py b/smmap/buf.py
index ad27b69..731b064 100644
--- a/smmap/buf.py
+++ b/smmap/buf.py
@@ -93,7 +93,7 @@ def __getslice__(self, i, j):
                     d = d.tobytes()
                 md.append(d)
             # END while there are bytes to read
-            return bytes().join(md)
+            return b''.join(md)
         # END fast or slow path
     #{ Interface
 
diff --git a/tox.ini b/tox.ini
index 092c79d..810badd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = flake8, py{36, 37, 38, 39, 310, 311}
+envlist = flake8, py{37, 38, 39, 310, 311}
 
 [testenv]
 commands = {envpython} -m pytest --cov smmap --cov-report xml {posargs}