diff --git a/imasbook04/package-lock.json b/imasbook04/package-lock.json
index e8b976d..94b2b4f 100644
--- a/imasbook04/package-lock.json
+++ b/imasbook04/package-lock.json
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@@ -1889,6 +1891,11 @@
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@@ -1935,6 +1942,11 @@
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+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
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@@ -1955,7 +1967,6 @@
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-          "integrity": "sha1-6eha2+ddoLvkyOBHaghikPhjtAQ=",
-          "dev": true
+          "integrity": "sha1-6eha2+ddoLvkyOBHaghikPhjtAQ="
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-      "dev": true
+      "integrity": "sha1-WvIvGMBSoACkjXuCxenC4v7tpyg="
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@@ -2029,28 +2038,134 @@
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+    "vivliostyle-savepdf": {
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+      "resolved": "https://registry.npmjs.org/vivliostyle-savepdf/-/vivliostyle-savepdf-1.3.1.tgz",
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-        "chrome-launcher": "^0.10.2",
-        "chrome-remote-interface": "^0.26.1",
-        "commander": "^2.18.0",
+        "boxen": "^4.1.0",
+        "chrome-launcher": "^0.11.2",
+        "chrome-remote-interface": "^0.27.2",
+        "commander": "^2.20.0",
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         "mathjax": "2.7.5",
-        "portfinder": "^1.0.17",
-        "preact": "^8.3.1",
-        "vivliostyle": "2018.8.100"
+        "portfinder": "^1.0.21",
+        "preact": "^8.5.1",
+        "vivliostyle": "~2019.8.101"
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+            "debug": "^3.1.1",
+            "mkdirp": "^0.5.5"
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+              "version": "0.5.5",
+              "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
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+              "requires": {
+                "minimist": "^1.2.5"
+              }
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+          "version": "8.5.3",
+          "resolved": "https://registry.npmjs.org/preact/-/preact-8.5.3.tgz",
+          "integrity": "sha512-O3kKP+1YdgqHOFsZF2a9JVdtqD+RPzCQc3rP+Ualf7V6rmRDchZ9MJbiGTT7LuyqFKZqlHSOyO/oMFmI2lVTsw=="
+        },
+        "vivliostyle": {
+          "version": "2019.8.101",
+          "resolved": "https://registry.npmjs.org/vivliostyle/-/vivliostyle-2019.8.101.tgz",
+          "integrity": "sha512-o6iSm77/qj185HXU+aGLnk1F3F5bx4Bg5Adrjtb3BAmRNN+obJMt20qFmtpQ3ltCQe9E/7nMpHY9/AiUndIZ/Q=="
+        },
+        "ws": {
+          "version": "6.2.2",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.2.tgz",
+          "integrity": "sha512-zmhltoSR8u1cnDsD43TX59mzoMZsLKqUweyYBAIvTngR3shc0W6aOZylZmq/7hqyVxPdi+5Ud2QInblgyE72fw==",
+          "requires": {
+            "async-limiter": "~1.0.0"
+          }
+        }
       }
     },
-    "vivliostyle": {
-      "version": "2018.8.100",
-      "resolved": "https://registry.npmjs.org/vivliostyle/-/vivliostyle-2018.8.100.tgz",
-      "integrity": "sha512-3XD4ynUhu57omK1UbBsrp2kBK0DWp20HLVl3NghJAIoFpX+DXdzdKim/wQAur59mdvMVUqYHZT6gVu60XIDutQ==",
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-    },
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       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.0.tgz",
@@ -2090,17 +2205,23 @@
         "isexe": "^2.0.0"
       }
     },
+    "widest-line": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-3.1.0.tgz",
+      "integrity": "sha512-NsmoXalsWVDMGupxZ5R08ka9flZjjiLvHVAWYOKtiKM8ujtZWr9cRffak+uSE48+Ob8ObalXpwyeUiyDD6QFgg==",
+      "requires": {
+        "string-width": "^4.0.0"
+      }
+    },
     "wordwrap": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
-      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
-      "dev": true
+      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc="
     },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
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diff --git a/imasbook04/yarn.lock b/imasbook04/yarn.lock
index 64db4ce..f7d3e08 100644
--- a/imasbook04/yarn.lock
+++ b/imasbook04/yarn.lock
@@ -303,7 +303,7 @@ debug@2.6.9, debug@^2.2.0, debug@^2.6.8:
   dependencies:
     ms "2.0.0"
 
-debug@^3.0.0, debug@^3.1.0:
+debug@^3.1.0:
   version "3.2.6"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
   integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
@@ -477,11 +477,9 @@ findup-sync@~0.3.0:
     glob "~5.0.0"
 
 follow-redirects@^1.0.0:
-  version "1.9.0"
-  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.9.0.tgz#8d5bcdc65b7108fe1508649c79c12d732dcedb4f"
-  integrity sha512-CRcPzsSIbXyVDl0QI01muNDu69S8trU4jArW9LpOt2WtC6LyUJetcIrmfHsRBx7/Jb6GHJUiuqyYxPooFfNt6A==
-  dependencies:
-    debug "^3.0.0"
+  version "1.14.7"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.14.7.tgz#2004c02eb9436eee9a21446a6477debf17e81685"
+  integrity sha512-+hbxoLbFMbRKDwohX8GkTataGqO6Jb7jGwpAlwgy2bIz25XtRm7KEzJM76R1WiNT5SwZkX4Y75SwBolkpmE7iQ==
 
 fresh@0.5.2:
   version "0.5.2"