diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39cfd4b..46e538a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,2 +1,2 @@
-* INTERNAL
-  * maintenance and refactoring release, no changes
+* ENHANCEMENT
+  * update dependencies
diff --git a/setup.py b/setup.py
index 47c4bae..a7b9a87 100644
--- a/setup.py
+++ b/setup.py
@@ -65,35 +65,35 @@ setup(
         "Topic :: Software Development",
     ],
     install_requires=[
-        "anyconfig==0.9.10",
-        "appdirs==1.4.3",
-        "attrs==19.3.0",
+        "anyconfig==0.9.11",
+        "appdirs==1.4.4",
+        "attrs==19.3.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
         "certifi==2020.4.5.1",
         "chardet==3.0.4",
         "colorama==0.4.3",
         "dateparser==0.7.4",
-        "docker==4.2.0",
+        "docker==4.2.1",
         "docker-pycreds==0.4.0",
-        "environs==7.3.1",
+        "environs==8.0.0",
         "idna==2.9",
         "importlib-metadata==1.6.0; python_version < '3.8'",
         "ipaddress==1.0.23",
         "jsonschema==3.2.0",
-        "marshmallow==3.5.1",
+        "marshmallow==3.6.1; python_version >= '3.5'",
         "nested-lookup==0.2.21",
         "pathspec==0.8.0",
         "pyrsistent==0.16.0",
         "python-dateutil==2.8.1",
-        "python-dotenv==0.12.0",
+        "python-dotenv==0.13.0",
         "python-json-logger==0.1.11",
-        "pytz==2019.3",
-        "regex==2020.4.4",
+        "pytz==2020.1",
+        "regex==2020.5.14",
         "requests==2.23.0",
         "ruamel.yaml==0.16.10",
-        "ruamel.yaml.clib==0.2.0; platform_python_implementation == 'CPython' and python_version < '3.9'",
-        "six==1.14.0",
-        "tzlocal==2.0.0",
-        "urllib3==1.25.8",
+        "ruamel.yaml.clib==0.2.0; python_version < '3.9' and platform_python_implementation == 'CPython'",
+        "six==1.15.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+        "tzlocal==2.1",
+        "urllib3==1.25.9; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
         "websocket-client==0.57.0",
         "zipp==1.2.0",
     ],