diff --git a/package.json b/package.json
index 1fd63c4..f3239ad 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "browserify": "^16.5.0",
     "lavamoat-browserify": "4.0.0",
     "readable-stream-patch": "kumavis/readable-stream#v2-no-util-mut",
-    "ses": "^0.6.4"
+    "ses": "^0.16.0"
   },
   "devDependencies": {
     "serve": "^11.2.0"
diff --git a/yarn.lock b/yarn.lock
index b51920a..38917b0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,11 +2,6 @@
 # yarn lockfile v1
 
 
-"@agoric/make-hardener@^0.0.6":
-  version "0.0.6"
-  resolved "https://registry.yarnpkg.com/@agoric/make-hardener/-/make-hardener-0.0.6.tgz#5903748a71381bc37e23d571390aaff9973c37b2"
-  integrity sha512-OpZcNx/7bhHar0iuQ6D+FKYCMMxqKvYs4aC/bB5v/ffZaSM5sNAl98DnGL1mD9NSyZLGzAZ7D5XwJpe37BMldQ==
-
 "@zeit/schemas@2.6.0":
   version "2.6.0"
   resolved "https://registry.yarnpkg.com/@zeit/schemas/-/schemas-2.6.0.tgz#004e8e553b4cd53d538bd38eac7bcbf58a867fe3"
@@ -669,11 +664,6 @@ escape-string-regexp@^1.0.5:
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
   integrity sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=
 
-esm@^3.2.25:
-  version "3.2.25"
-  resolved "https://registry.yarnpkg.com/esm/-/esm-3.2.25.tgz#342c18c29d56157688ba5ce31f8431fbb795cc10"
-  integrity sha512-U1suiZ2oDVWv4zPO56S0NcR5QriEahGtdN2OR6FiOG4WJvcjBVFB0qI4+eKoWFH483PKGuLuu6V8Z4T5g63UVA==
-
 events@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/events/-/events-2.1.0.tgz#2a9a1e18e6106e0e812aa9ebd4a819b3c29c0ba5"
@@ -1477,11 +1467,6 @@ readable-stream@^2.0.2, readable-stream@^2.2.2, readable-stream@~2.3.6:
     string_decoder "~1.1.1"
     util-deprecate "~1.0.1"
 
-realms-shim@^1.2.1:
-  version "1.2.1"
-  resolved "https://registry.yarnpkg.com/realms-shim/-/realms-shim-1.2.1.tgz#7d6afb2ad4007296b527a0b731fefd7b6620652d"
-  integrity sha512-IS1OrGSFt3k1Sv4Re2NxNrul5XCnc7XRGpaLiBKPU97RKcxVg2NbcZm2YoG5kLo9Emk5YG1gGv9zlNtplQSrMA==
-
 registry-auth-token@3.3.2:
   version "3.3.2"
   resolved "https://registry.yarnpkg.com/registry-auth-token/-/registry-auth-token-3.3.2.tgz#851fd49038eecb586911115af845260eec983f20"
@@ -1585,14 +1570,10 @@ serve@^11.2.0:
     serve-handler "6.1.2"
     update-check "1.5.2"
 
-ses@^0.6.4:
-  version "0.6.4"
-  resolved "https://registry.yarnpkg.com/ses/-/ses-0.6.4.tgz#ad1f33cf8486d925f43205a37a478136d97e997f"
-  integrity sha512-EEGe8FIUSMtkqJn6bjoplpsc9UjivPwqy1XKUdnHUR99SIkXlho8HzXX7mWL1mlwzvqMt5nvqMPE7fLDRmFZpA==
-  dependencies:
-    "@agoric/make-hardener" "^0.0.6"
-    esm "^3.2.25"
-    realms-shim "^1.2.1"
+ses@^0.16.0:
+  version "0.16.0"
+  resolved "https://registry.yarnpkg.com/ses/-/ses-0.16.0.tgz#d405fff49daa8e19b1b04344e2a752c9268afa72"
+  integrity sha512-2oKCzl3W24aNqBifLWWEh3OGd+78+SY1GVKWP5ogrqBOjs3X1trwE2akx5pX4M1MFExqXoJGav1CmCq2KBMqOg==
 
 sesify-tofu@^2.0.4:
   version "2.0.4"