diff --git a/packages/dynamo/package.json b/packages/dynamo/package.json
index cf8bab3..ba45a09 100644
--- a/packages/dynamo/package.json
+++ b/packages/dynamo/package.json
@@ -36,7 +36,7 @@
     "@toi/toix": "^1.0.13"
   },
   "devDependencies": {
-    "@types/mocha": "^5.2.5",
+    "@types/mocha": "^8.2.3",
     "@types/node": "^10.0.0",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
diff --git a/packages/toi/package.json b/packages/toi/package.json
index e6f60aa..178bf26 100644
--- a/packages/toi/package.json
+++ b/packages/toi/package.json
@@ -29,7 +29,7 @@
   "license": "MIT",
   "dependencies": {},
   "devDependencies": {
-    "@types/mocha": "^5.2.5",
+    "@types/mocha": "^8.2.3",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
     "mocha": "^5.2.0",
diff --git a/packages/toix/package.json b/packages/toix/package.json
index d64ea5f..ee5fa0f 100644
--- a/packages/toix/package.json
+++ b/packages/toix/package.json
@@ -36,7 +36,7 @@
     "isemail": "^3.2.0"
   },
   "devDependencies": {
-    "@types/mocha": "^5.2.5",
+    "@types/mocha": "^8.2.3",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
     "mocha": "^5.2.0",
diff --git a/yarn.lock b/yarn.lock
index 9bd22e3..f5c4f4f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -90,10 +90,10 @@
     lodash "^4.17.10"
     to-fast-properties "^2.0.0"
 
-"@types/mocha@^5.2.5":
-  version "5.2.5"
-  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-5.2.5.tgz#8a4accfc403c124a0bafe8a9fc61a05ec1032073"
-  integrity sha512-lAVp+Kj54ui/vLUFxsJTMtWvZraZxum3w3Nwkble2dNuV5VnPA+Mi2oGX9XYJAaIvZi3tn3cbjS/qcJXRb6Bww==
+"@types/mocha@^8.2.3":
+  version "8.2.3"
+  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-8.2.3.tgz#bbeb55fbc73f28ea6de601fbfa4613f58d785323"
+  integrity sha512-ekGvFhFgrc2zYQoX4JeZPmVzZxw6Dtllga7iGHzfbYIYkAMUx/sAFP2GdFpLff+vdHXu5fl7WX9AT+TtqYcsyw==
 
 "@types/node@^10.0.0":
   version "10.14.8"
@@ -275,7 +275,7 @@ color-name@1.1.3:
 
 commander@2.15.1:
   version "2.15.1"
-  resolved "http://registry.npmjs.org/commander/-/commander-2.15.1.tgz#df46e867d0fc2aec66a34662b406a9ccafff5b0f"
+  resolved "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz#df46e867d0fc2aec66a34662b406a9ccafff5b0f"
   integrity sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag==
 
 commander@~2.17.1:
@@ -845,22 +845,22 @@ mimic-fn@^1.0.0:
 
 minimist@0.0.8:
   version "0.0.8"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
   integrity sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=
 
 minimist@^1.2.0:
   version "1.2.0"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
   integrity sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=
 
 minimist@~0.0.1:
   version "0.0.10"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz#de3f98543dbf96082be48ad1a0c7cda836301dcf"
+  resolved "https://registry.npmjs.org/minimist/-/minimist-0.0.10.tgz#de3f98543dbf96082be48ad1a0c7cda836301dcf"
   integrity sha1-3j+YVD2/lggr5IrRoMfNqDYwHc8=
 
 mkdirp@0.5.1, mkdirp@0.5.x, mkdirp@^0.5.0, mkdirp@^0.5.1:
   version "0.5.1"
-  resolved "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
+  resolved "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   integrity sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=
   dependencies:
     minimist "0.0.8"
@@ -1465,7 +1465,7 @@ wordwrap@~0.0.2:
 
 wrap-ansi@^2.0.0:
   version "2.1.0"
-  resolved "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz#d8fc3d284dd05794fe84973caecdd1cf824fdd85"
+  resolved "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz#d8fc3d284dd05794fe84973caecdd1cf824fdd85"
   integrity sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=
   dependencies:
     string-width "^1.0.1"
@@ -1524,7 +1524,7 @@ yargs-parser@^9.0.2:
 
 yargs@11.1.0:
   version "11.1.0"
-  resolved "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz#90b869934ed6e871115ea2ff58b03f4724ed2d77"
+  resolved "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz#90b869934ed6e871115ea2ff58b03f4724ed2d77"
   integrity sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==
   dependencies:
     cliui "^4.0.0"