diff --git a/hakone_wordcloud/Pipfile.lock b/hakone_wordcloud/Pipfile.lock
index a2afaa5..ebceb59 100644
--- a/hakone_wordcloud/Pipfile.lock
+++ b/hakone_wordcloud/Pipfile.lock
@@ -25,45 +25,53 @@
         },
         "kiwisolver": {
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         },
         "matplotlib": {
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@@ -113,52 +121,86 @@
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+            "version": "==2.8.2"
         },
         "six": {
             "hashes": [
-                "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a",
-                "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
-            "version": "==1.14.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.16.0"
         }
     },
     "develop": {}