diff --git a/packages/neo-one-client-full-core/package.json b/packages/neo-one-client-full-core/package.json
index ce1796323c..3c26bc2903 100644
--- a/packages/neo-one-client-full-core/package.json
+++ b/packages/neo-one-client-full-core/package.json
@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "@neo-one/node-core": "^1.0.1",
-    "@reactivex/ix-es2015-cjs": "2.3.5",
+    "@reactivex/ix-es2015-cjs": "2.4.3",
     "@types/bn.js": "4.11.3",
     "bn.js": "4.11.8",
     "rxjs": "6.3.3"
diff --git a/yarn.lock b/yarn.lock
index e0e6bec980..3fb64b347c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2249,7 +2249,16 @@
     react-lifecycles-compat "^3.0.4"
     warning "^3.0.0"
 
-"@reactivex/ix-es2015-cjs@2.3.5", "@reactivex/ix-es2015-cjs@^2.3.5":
+"@reactivex/ix-es2015-cjs@2.4.3":
+  version "2.4.3"
+  resolved "https://registry.yarnpkg.com/@reactivex/ix-es2015-cjs/-/ix-es2015-cjs-2.4.3.tgz#9745fa341d9ee61e68fbea797cf72ab2cfba0013"
+  dependencies:
+    "@types/node" "^10.12.18"
+    is-stream "1.1.0"
+    rxjs "5.5.11"
+    tslib "^1.9.3"
+
+"@reactivex/ix-es2015-cjs@^2.3.5":
   version "2.3.5"
   resolved "https://registry.yarnpkg.com/@reactivex/ix-es2015-cjs/-/ix-es2015-cjs-2.3.5.tgz#f50adc537e0c1fa91d68f5870bbc7e3d1ec9d327"
   dependencies:
@@ -2848,6 +2857,10 @@
   version "10.12.9"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-10.12.9.tgz#a07bfa74331471e1dc22a47eb72026843f7b95c8"
 
+"@types/node@^10.12.18":
+  version "10.12.18"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-10.12.18.tgz#1d3ca764718915584fcd9f6344621b7672665c67"
+
 "@types/node@^9.4.6":
   version "9.6.39"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-9.6.39.tgz#111cb4f5591cb6945aad34733b4e40bfd59b58fc"
@@ -10466,7 +10479,7 @@ is-stream-ended@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/is-stream-ended/-/is-stream-ended-0.1.4.tgz#f50224e95e06bce0e356d440a4827cd35b267eda"
 
-is-stream@^1.0.0, is-stream@^1.0.1, is-stream@^1.1.0:
+is-stream@1.1.0, is-stream@^1.0.0, is-stream@^1.0.1, is-stream@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
 
@@ -16544,6 +16557,12 @@ rxjs-tslint-rules@4.14.1:
     tslib "^1.8.0"
     tsutils "^3.0.0"
 
+rxjs@5.5.11:
+  version "5.5.11"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-5.5.11.tgz#f733027ca43e3bec6b994473be4ab98ad43ced87"
+  dependencies:
+    symbol-observable "1.0.1"
+
 rxjs@6.3.3, rxjs@^6.1.0, rxjs@^6.3.3:
   version "6.3.3"
   resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-6.3.3.tgz#3c6a7fa420e844a81390fb1158a9ec614f4bad55"