diff --git a/Pipfile.lock b/Pipfile.lock
index b3c0525..ae2272c 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -224,11 +224,10 @@
         },
         "six": {
             "hashes": [
-                "sha256:1f1b7d42e254082a9db6279deae68afb421ceba6158efa6131de7b3003ee93fd",
-                "sha256:30f610279e8b2578cab6db20741130331735c781b56053c59c4076da27f06b66"
+                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
+                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
             ],
-            "index": "pypi",
-            "version": "==1.13.0"
+            "version": "==1.15.0"
         },
         "wcwidth": {
             "hashes": [
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 39f24f0..8fb9680 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,7 +6,7 @@ pyflakes==2.1.1
 #deps pytest
 py==1.8.0
 more-itertools==8.0.2
-six==1.13.0
+six==1.15.0
 attrs==19.3.0
 pluggy==0.13.1
 pytest==5.3.2