diff --git a/Pipfile b/Pipfile
index 7f85c4d..4641b3b 100644
--- a/Pipfile
+++ b/Pipfile
@@ -17,7 +17,7 @@ jupyterlab = "==0.35.4"
 jupytext = "==1.0.2"
 livelossplot = "==0.3.0"
 matplotlib = "==3.0.3"
-netcdf4 = "==1.4.1"
+netcdf4 = "==1.4.3.2"
 numpy = "==1.16.2"
 onnx_chainer = "==1.3.2"
 optuna = "==0.7.0"
diff --git a/Pipfile.lock b/Pipfile.lock
index 271f44d..4f5ac2c 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "bd232c15cc92b74cbf2287a161827576e26f2963e39a38310da4b4c3ef14d934"
+            "sha256": "813b565a46e2bf0b351af59b8f509a31ce2bcfc50835f6e1c6632ee598d9635a"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -566,34 +566,32 @@
         },
         "netcdf4": {
             "hashes": [
-                "sha256:056210e83688b104b71281ab9fe45e5fd945d65580cc8030865921e78016cf6f",
-                "sha256:11829a2572b985f9e202d5b550b52334a2ecf66dbfa7af69e6112c9ebf8b03d2",
-                "sha256:1876219e90ce68cef76b7fcaa2dfbe847ece251296fabd55f5d6a7d9be6383d7",
-                "sha256:18fbcb26c3005cbae4de160bc22eacd757b3de248278d8e30f03ab27d2d4ded0",
-                "sha256:45ee95cba5f5891a11bc0f9c69947c1e9a764e88a1aa7e0b38fae8974f983b98",
-                "sha256:579a814b373336563f3a38b772ba459ff81222efad9376bc9fe090b882fc8dfc",
-                "sha256:5ad5a92faa2ce3bf80d8451cca5272948561dbd25a6eea232670a0ccead9f05c",
-                "sha256:61e84511575618857b1069db385817974c725fa9fed084218c670d6cd29e5c55",
-                "sha256:70d9424d8b3ce097e190a8e5fc4dd8b2642a88a38bb99e39c4ddae873dcd1cb6",
-                "sha256:86e114c8a58b72ce89c29575912d60c5efbbc582f33eb32cf68bfade31d07a27",
-                "sha256:917f0e18bc9e53413cefccd86b71f0a5a627769f28f2803feeffaaffd42517be",
-                "sha256:a269c2a375ef1361be462d6c04c3a55bc8e6e717ff1d2eed20b2e188459fbb81",
-                "sha256:ac1ae16300eb5c90db9d468a6c976a856bfacafe1ee4a9be7ad6310b10e88a0f",
-                "sha256:aebc09dd071de3976d35b9acd4d3f2ca74e2656a07464f7bc7a9e4082b5ee9b0",
-                "sha256:b1ea54ccf3c1dc46a3a7463708d4f1470e94892c5c9754d9c35a103b75d82c70",
-                "sha256:ba231ce919cef00b251f89b7406cc3117c60fc32519665bbf7912921bf425f8f",
-                "sha256:c0dab6916693b5eaae89740eaab1a50ba337c6c280d923e1552d638600e1d7e0",
-                "sha256:c7d5a748c570a9342e9b1280ef021c2219739fd2fe5a8ce02eb970ffee1f5c36",
-                "sha256:cab62d95c8deb822ac3ecd8dc78043bb163d95b2568b4e93b3baa438d8324edf",
-                "sha256:cac34ec37e115a2762741a288db7be9b3256b6deb4a9bb0cdb7e207c3f6fb0b2",
-                "sha256:d4fc65b98e348c39d082ab6b4b7f6d636b1b4e63bec016e5bca189fee5d46403",
-                "sha256:def8226a7806e1084abfa43318796b4c806eda4b14a013e2c072468eba8d91e3",
-                "sha256:e943f3f4e209ad1f3284406097d7bf47da5176840923e30f0bdcfe85d38c4f7f",
-                "sha256:ec07c03f102eef4566131f5b5451eff5ca5761874e3ce81a8b124556d0ebed52",
-                "sha256:f1cad3f65a0784c7bb7d0dd1c85af2900602e2d8067652184a742ca70daf56fc"
+                "sha256:094248504e1025e55786edd2a4e521d7da271a3211cbcfd0aa48e498ce35e469",
+                "sha256:19041d9932e64238a8054b8a7653f63f653e4ba90c0e4f50ddafd8f6c06bc653",
+                "sha256:29b055e88f3212931d3f1b43cbe23a43fd3a89b9d84b7308bcb2d33c1ec242d6",
+                "sha256:2cdfa8185657f12cbad35cdb3ab2c928c73b74d906477211f6b361e83a3aca4a",
+                "sha256:326130b5c950e017a066c9ce9b97d1e6b6615d794975b1bea10cb277340b5dc6",
+                "sha256:4323b8d94805439473fe8fd72fa46617cde762face81371541533061a11936f9",
+                "sha256:456377e03940d758239cfdf3be125cd50e0724fcc819efb3b30800470fbe8a7c",
+                "sha256:5ae0ea8658a83c4c62a76af5a764aad3b4608d7376f07deb143d00817901da9a",
+                "sha256:5d68b70ae685599078fd82d0483a24b149e12a5aa2d013c870042e262efb9ae4",
+                "sha256:69f8db8437d73f67622a8263d2b427c57b75264c0755f4ab6d54f51cd00e95e0",
+                "sha256:8b318aae59a16990c71be3c1477d6e6dfdadb3ae4d1f9c1796b413f4b22e9d62",
+                "sha256:8f33605f7c157ccdcc39e1436dca8d9336270a897e2d35c60968a5df14237644",
+                "sha256:9463ba1d89d22d3d7e4e4b6318af1fc71a2a2fa6c53b0675022adfd1d6acc5a4",
+                "sha256:97ffc93e5f14a5dc8f1d31c5107182c8fc98598cb5bfee0d3c402a826aa4fb27",
+                "sha256:9eb94aad6483f0ef078223eb79321467b90b270369245907f74b0cfa2ad4db8a",
+                "sha256:a77869f28f9e62fa58be5976004cd5ae2a464fc237734f24f451496425ee2ca3",
+                "sha256:b4d772226a712716ff7e139a0d9af3e54b88feac995e77333eafe99353949d9d",
+                "sha256:c1a2e1ac284cf631876c08f6382bd173d733aa6ab498c87e3a048b53adc68f41",
+                "sha256:ccd13ddd4f74ae74f774b81dc4e5eef38f3043794d752bed2ebd14bca8aa8789",
+                "sha256:edcd653782e8f11f036204900377a0d86af06964aac8e8ce1a01dfa44ccdb103",
+                "sha256:f062408d3420ee7ba65801a7f46757694840e2c7eeebc31a11a00ad51a417b94",
+                "sha256:fa45d0473533bff86074fbe6662b1f3c0d35b77f861156b9a60c3e1415d76390",
+                "sha256:fc038392d78e622f6222294a6d62538f149f41b09bdd2a5bd8421f7e6a4914b5"
             ],
             "index": "pypi",
-            "version": "==1.4.1"
+            "version": "==1.4.3.2"
         },
         "netifaces": {
             "hashes": [