diff --git a/poetry.lock b/poetry.lock
index f9ecdc7..14587c2 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -8,11 +8,11 @@ python-versions = "*"
 
 [[package]]
 name = "astroid"
-version = "2.5.1"
+version = "2.5.6"
 description = "An abstract syntax tree for Python with inference support."
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = "~=3.6"
 
 [package.dependencies]
 lazy-object-proxy = ">=1.4.0"
@@ -712,8 +712,8 @@ appdirs = [
     {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
 ]
 astroid = [
-    {file = "astroid-2.5.1-py3-none-any.whl", hash = "sha256:21d735aab248253531bb0f1e1e6d068f0ee23533e18ae8a6171ff892b98297cf"},
-    {file = "astroid-2.5.1.tar.gz", hash = "sha256:cfc35498ee64017be059ceffab0a25bedf7548ab76f2bea691c5565896e7128d"},
+    {file = "astroid-2.5.6-py3-none-any.whl", hash = "sha256:4db03ab5fc3340cf619dbc25e42c2cc3755154ce6009469766d7143d1fc2ee4e"},
+    {file = "astroid-2.5.6.tar.gz", hash = "sha256:8a398dfce302c13f14bab13e2b14fe385d32b73f4e4853b9bdfb64598baa1975"},
 ]
 atomicwrites = [
     {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},