python-poetry
diff --git a/‎poetry.lock
+39-128 b/‎poetry.lock
+39-128
diff --git a/‎pyproject.toml
+4-1 b/‎pyproject.toml
+4-1
@@ -31,7 +31,10 @@ crashtest = { version = "^0.3.0", python = "^3.6" }
 requests = "^2.18"
 cachy = "^0.3.0"
 requests-toolbelt = "^0.9.1"
-cachecontrol = { version = "^0.12.4", extras = ["filecache"] }
+cachecontrol = [
+    { version = "^0.12.4", extras = ["filecache"], python = "<3.6" },
+    { version = "^0.12.9", extras = ["filecache"], python = "^3.6" }
+]
 pkginfo = "^1.4"
 html5lib = "^1.0"
 shellingham = "^1.1"