diff --git a/packages/oo7-substrate/package.json b/packages/oo7-substrate/package.json
index 783e0fc..c45072a 100644
--- a/packages/oo7-substrate/package.json
+++ b/packages/oo7-substrate/package.json
@@ -23,7 +23,7 @@
   },
   "homepage": "https://github.com/paritytech/oo7/tree/master/packages/oo7-substrate#readme",
   "dependencies": {
-    "@polkadot/util": "^0.41.1",
+    "@polkadot/util": "^0.76.1",
     "@polkadot/wasm-crypto": "^0.5.1",
     "@polkadot/wasm-schnorrkel": "^0.3.1",
     "base-x": "^3.0.4",
diff --git a/packages/oo7-substrate/yarn.lock b/packages/oo7-substrate/yarn.lock
index 4a36e9e..6bcacda 100644
--- a/packages/oo7-substrate/yarn.lock
+++ b/packages/oo7-substrate/yarn.lock
@@ -2,24 +2,24 @@
 # yarn lockfile v1
 
 
-"@babel/runtime@^7.4.0":
-  version "7.4.2"
-  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.4.2.tgz#f5ab6897320f16decd855eed70b705908a313fe8"
-  integrity sha512-7Bl2rALb7HpvXFL7TETNzKSAeBVCPHELzc0C//9FCxN8nsiueWSJBqaF+2oIJScyILStASR/Cx5WMkXGYTiJFA==
+"@babel/runtime@^7.4.3":
+  version "7.4.3"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.4.3.tgz#79888e452034223ad9609187a0ad1fe0d2ad4bdc"
+  integrity sha512-9lsJwJLxDh/T3Q3SZszfWOTkk3pHbkmH+3KY+zwIDmsNlxsumuhS2TH3NIpktU4kNvfzy+k3eLT7aTJSPTo0OA==
   dependencies:
     regenerator-runtime "^0.13.2"
 
-"@polkadot/util@^0.41.1":
-  version "0.41.1"
-  resolved "https://registry.yarnpkg.com/@polkadot/util/-/util-0.41.1.tgz#b67762a0a7408138d843adc7240944e704e819e7"
-  integrity sha512-1mFHxxdXyRgeFk0ygfJklzsf6HiEEMikrpUgr+3Dw5S7KromjPD8EbWkpcZQZ3Png5PTwGyjrx7MYY4Ajiu5xQ==
+"@polkadot/util@^0.76.1":
+  version "0.76.1"
+  resolved "https://registry.yarnpkg.com/@polkadot/util/-/util-0.76.1.tgz#d21e7f4c22c1c374a7811055f2771a0a90131624"
+  integrity sha512-N1WRnct7CSBUx6cj3SNkAT4vdznYungsMSURiYDTsHpV1EJUI16tPj//OFEl548/0q3N58cePyEn0qB0hFi6zA==
   dependencies:
-    "@babel/runtime" "^7.4.0"
-    "@types/bn.js" "^4.11.4"
+    "@babel/runtime" "^7.4.3"
+    "@types/bn.js" "^4.11.5"
     "@types/deasync" "^0.1.0"
     "@types/ip-regex" "^3.0.0"
     bn.js "^4.11.8"
-    camelcase "^5.2.0"
+    camelcase "^5.3.0"
     chalk "^2.4.2"
     ip-regex "^4.0.0"
     moment "^2.24.0"
@@ -34,10 +34,10 @@
   resolved "https://registry.yarnpkg.com/@polkadot/wasm-schnorrkel/-/wasm-schnorrkel-0.3.1.tgz#08287848f769dee4955517348905888bd289f277"
   integrity sha512-2J/lNZe7oDWvzUbsEfvKfiiAvBIBbIsppeBGahwSg2Y+cLweQgThXGizPpQoPo0tHxgMKdTi6jhPu7tLzCW/cA==
 
-"@types/bn.js@^4.11.4":
-  version "4.11.4"
-  resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-4.11.4.tgz#a7bed5bdef9f16b25c92ba27745ab261374787d7"
-  integrity sha512-AO8WW+aRcKWKQAYTfKLzwnpL6U+TfPqS+haRrhCy5ff04Da8WZud3ZgVjspQXaEXJDcTlsjUEVvL39wegDek5w==
+"@types/bn.js@^4.11.5":
+  version "4.11.5"
+  resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-4.11.5.tgz#40e36197433f78f807524ec623afcf0169ac81dc"
+  integrity sha512-AEAZcIZga0JgVMHNtl1CprA/hXX7/wPt79AgR4XqaDt7jyj3QWYw6LPoOiznPtugDmlubUnAahMs2PFxGcQrng==
   dependencies:
     "@types/node" "*"
 
@@ -147,10 +147,10 @@ camel-case@^3.0.0:
     no-case "^2.2.0"
     upper-case "^1.1.1"
 
-camelcase@^5.2.0:
-  version "5.2.0"
-  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.2.0.tgz#e7522abda5ed94cc0489e1b8466610e88404cf45"
-  integrity sha512-IXFsBS2pC+X0j0N/GE7Dm7j3bsEBp+oTpb7F50dwEVX7rf3IgwO9XatnegTsDtniKCUtEJH4fSU6Asw7uoVLfQ==
+camelcase@^5.3.0:
+  version "5.3.1"
+  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.3.1.tgz#e3c9b31569e106811df242f715725a1f4c494320"
+  integrity sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
 
 canvas-renderer@~2.1.1:
   version "2.1.1"
@@ -522,10 +522,10 @@ once@^1.3.0:
   dependencies:
     wrappy "1"
 
-oo7@^0.7.10:
-  version "0.7.10"
-  resolved "https://registry.yarnpkg.com/oo7/-/oo7-0.7.10.tgz#5ecc2b76f04f585679ffe13f1e3ab527389b700c"
-  integrity sha512-jUCFP0gxyjDyjuxd6/CfuY7tQ63dKJNWdO/V8hjyAAXUHPGNL2CmMJOa/2TysR+E/L7Ha8UXZ6xUiOunbrejSw==
+oo7@^0.7.12:
+  version "0.7.12"
+  resolved "https://registry.yarnpkg.com/oo7/-/oo7-0.7.12.tgz#bd7a01ba4e815c1fcde9bea2a9a8226d06ec781e"
+  integrity sha512-nVmxwLIiVCY4Aid6/+p2ujJ2mj3yh15zQ3xSl3UPui7U37DJJfD0KmuMjp+XOWH1HxTkKhIKDgR34eEhFHNxgA==
 
 param-case@^2.1.0:
   version "2.1.1"