diff --git a/merkle-tree/package-lock.json b/merkle-tree/package-lock.json
index 9c3a19c..47b5194 100644
--- a/merkle-tree/package-lock.json
+++ b/merkle-tree/package-lock.json
@@ -20,6 +20,17 @@
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         "slash": "^2.0.0",
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+          "dev": true,
+          "requires": {
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+          }
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@@ -810,6 +821,17 @@
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         "pirates": "^4.0.0",
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@@ -1852,9 +1874,9 @@
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@@ -2988,18 +3010,18 @@
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+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.5.tgz",
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@@ -3336,13 +3358,6 @@
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@@ -3365,13 +3380,13 @@
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-          "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
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+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.6.tgz",
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-            "minimist": "0.0.8"
+            "minimist": "^1.2.6"
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@@ -3528,15 +3543,6 @@
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@@ -4795,9 +4801,9 @@
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-      "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
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@@ -4845,19 +4851,9 @@
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-      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
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-          "version": "0.0.8",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
-          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
-        }
-      }
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-2.1.4.tgz",
+      "integrity": "sha512-Cy9cV4pRSl1o10i1dURTuRt4T04l0DkS1WZrT+Jir886OqOVkSv4FbOA7pgjhS8kEUrmm4kCRvv5var2iOCxpA=="
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@@ -4868,9 +4864,9 @@
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-      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.2.2.tgz",
-      "integrity": "sha512-FgDS9Re79yU1xz5d+C4rv1G7QagNGHZ+iXF81hO8zY35YZZcLEsJVfFolfsqKFWunATEvNzMK0r/CwWd/szO9A==",
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.2.3.tgz",
+      "integrity": "sha512-0R/3FvjIGH3eEuG17ccFPk117XL2rWxatr81a57D+r/x2uTYZRbdZ4oVidEUMh2W2TJDa7MdAb12Lm2/qrKajg==",
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@@ -4885,7 +4881,7 @@
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         "minimatch": "3.0.4",
-        "mkdirp": "0.5.1",
+        "mkdirp": "0.5.4",
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         "node-environment-flags": "1.0.5",
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@@ -4893,8 +4889,8 @@
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         "which": "1.3.1",
         "wide-align": "1.1.3",
-        "yargs": "13.3.0",
-        "yargs-parser": "13.1.1",
+        "yargs": "13.3.2",
+        "yargs-parser": "13.1.2",
         "yargs-unparser": "1.6.0"
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@@ -4921,6 +4917,15 @@
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           }
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+        "mkdirp": {
+          "version": "0.5.4",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.4.tgz",
+          "integrity": "sha512-iG9AK/dJLtJ0XNgTuDbSyNS3zECqDlAhnQW4CsNxBG3LQJBbHmRX1egw39DmtOdCAqY+dKXV+sgPgilNWUKMVw==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        },
         "ms": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
@@ -5437,6 +5442,17 @@
         "graceful-fs": "^4.1.11",
         "is-plain-obj": "^1.1.0",
         "mkdirp": "^0.5.1"
+      },
+      "dependencies": {
+        "mkdirp": {
+          "version": "0.5.6",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.6.tgz",
+          "integrity": "sha512-FP+p8RB8OWpF3YZBCrP5gtADmtXApB5AMLn+vdyA+PyxCjrCs00mjyUozssO33cwDeT3wNGdLxJ5M//YqtHAJw==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.6"
+          }
+        }
       }
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@@ -6602,7 +6618,7 @@
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-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "integrity": "sha512-D9cPgkvLlV3t3IzL0D0YLvGA9Ahk4PcvVwUbN0dSGr1aP0Nrt4AEnTUbuGvquEC0mA64Gqt1fzirlRs5ibXx8g==",
       "dev": true
     },
     "sshpk": {
@@ -6815,6 +6831,14 @@
         "yallist": "^3.0.3"
       },
       "dependencies": {
+        "mkdirp": {
+          "version": "0.5.6",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.6.tgz",
+          "integrity": "sha512-FP+p8RB8OWpF3YZBCrP5gtADmtXApB5AMLn+vdyA+PyxCjrCs00mjyUozssO33cwDeT3wNGdLxJ5M//YqtHAJw==",
+          "requires": {
+            "minimist": "^1.2.6"
+          }
+        },
         "yallist": {
           "version": "3.1.1",
           "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
@@ -7646,9 +7670,9 @@
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-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+          "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
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@@ -7759,9 +7783,9 @@
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     "y18n": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+      "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
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@@ -7776,9 +7800,9 @@
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-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
-      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
       "dev": true,
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@@ -7790,13 +7814,13 @@
         "string-width": "^3.0.0",
         "which-module": "^2.0.0",
         "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.1"
+        "yargs-parser": "^13.1.2"
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+          "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
           "dev": true
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@@ -7822,9 +7846,9 @@
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-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
-      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
diff --git a/merkle-tree/package.json b/merkle-tree/package.json
index 01c7ca6..33f3d41 100644
--- a/merkle-tree/package.json
+++ b/merkle-tree/package.json
@@ -40,6 +40,6 @@
     "@babel/preset-env": "^7.6.3",
     "@babel/register": "^7.6.2",
     "nodemon": "^1.19.4",
-    "mocha": "^6.2.2"
+    "mocha": "^6.2.3"
   }
 }