diff --git a/.circleci/config.yml b/.circleci/config.yml
index f410162b48..b3abd48786 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ jobs:
   build:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0-node-browsers
+      - image: circleci/elixir:1.9.1-node-browsers
         environment:
           MIX_ENV: test
           # match POSTGRES_PASSWORD for postgres image below
@@ -129,7 +129,7 @@ jobs:
   check_formatted:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0
+      - image: circleci/elixir:1.9.1
         environment:
           MIX_ENV: test
 
@@ -143,7 +143,7 @@ jobs:
   credo:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0
+      - image: circleci/elixir:1.9.1
         environment:
           MIX_ENV: test
 
@@ -177,7 +177,7 @@ jobs:
   dialyzer:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0
+      - image: circleci/elixir:1.9.1
         environment:
           MIX_ENV: test
 
@@ -247,7 +247,7 @@ jobs:
   gettext:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0
+      - image: circleci/elixir:1.9.1
         environment:
           MIX_ENV: test
 
@@ -286,7 +286,7 @@ jobs:
   release:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0
+      - image: circleci/elixir:1.9.1
         environment:
           MIX_ENV: prod
 
@@ -312,7 +312,7 @@ jobs:
   sobelow:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0
+      - image: circleci/elixir:1.9.1
         environment:
           MIX_ENV: test
 
@@ -336,7 +336,7 @@ jobs:
   test_geth_http_websocket:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0-node-browsers
+      - image: circleci/elixir:1.9.1-node-browsers
         environment:
           MIX_ENV: test
           # match POSTGRES_PASSWORD for postgres image below
@@ -390,7 +390,7 @@ jobs:
   test_geth_mox:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0-node-browsers
+      - image: circleci/elixir:1.9.1-node-browsers
         environment:
           MIX_ENV: test
           # match POSTGRES_PASSWORD for postgres image below
@@ -444,7 +444,7 @@ jobs:
   test_parity_http_websocket:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0-node-browsers
+      - image: circleci/elixir:1.9.1-node-browsers
         environment:
           MIX_ENV: test
           # match POSTGRES_PASSWORD for postgres image below
@@ -498,7 +498,7 @@ jobs:
   test_parity_mox:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0-node-browsers
+      - image: circleci/elixir:1.9.1-node-browsers
         environment:
           MIX_ENV: test
           # match POSTGRES_PASSWORD for postgres image below
@@ -552,7 +552,7 @@ jobs:
   coveralls_merge:
     docker:
       # Ensure .tool-versions matches
-      - image: circleci/elixir:1.9.0
+      - image: circleci/elixir:1.9.1
         environment:
           MIX_ENV: test
 
diff --git a/docker/Dockerfile b/docker/Dockerfile
index f73c4b34f0..97580300c1 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM bitwalker/alpine-elixir-phoenix:1.9.0
+FROM bitwalker/alpine-elixir-phoenix:1.9.1
 
 RUN apk --no-cache --update add alpine-sdk gmp-dev automake libtool inotify-tools autoconf python