diff --git a/Pipfile b/Pipfile
index b04ed0b2d2e4c974994d4eb6735882cdbcd3d0ac..1b54e23157b91daefd2c4dfe97851fd0f8aa0fb0 100644
--- a/Pipfile
+++ b/Pipfile
@@ -14,19 +14,22 @@ prettytable = "*"
 jsonrpcserver = "4.1.3+8f3437a"
 aiohttp = "*"
 aiopg = "*"
-"psycopg2-binary" = "*"
-"diff-match-patch" = "*"
-"tox" = "*"
+psycopg2-binary = "*"
+diff-match-patch = "*"
+tox = "*"
 
 [dev-packages]
 
-"ipython" = "*"
-"pep8" = "*"
-"pytest" = "*"
-"pytest-cov" = "*"
-"pytest-docker" = "*"
-"pytest-pylint" = "*"
-"pytest-asyncio" = "*"
-"pytest-console-scripts" = "*"
-"yapf" = "*"
-"autopep8" = "*"
+ipython = "*"
+pep8 = "*"
+pytest = "*"
+pytest-cov = "*"
+pytest-docker = "*"
+pytest-pylint = "*"
+pytest-asyncio = "*"
+pytest-console-scripts = "*"
+yapf = "*"
+autopep8 = "*"
+
+[requires]
+python_version = "3.6"
diff --git a/requirements.txt b/requirements.txt
index 033b9bc2e564cdcb19e51b53eaa60218b108f98c..9794f2c41246508b74142a830678a3c03a7f7cd5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,5 +39,5 @@ tzlocal==2.0.0
 ujson==2.0.3
 urllib3==1.25.9
 yarl==1.4.2
-diff-match-patch=20200713
-tox
+diff-match-patch==20200713
+tox==3.19.0