diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1fce3944..ec28f11b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,13 +2,13 @@ version: 2.0
 defaults: &defaults
   working_directory: /nerves/build
   docker:
-    - image: nervesproject/nerves_system_br:1.6.1
+    - image: nervesproject/nerves_system_br:1.7.2
 
 install_elixir: &install_elixir
   run:
     name: Install Elixir
     command: |
-      wget https://github.com/elixir-lang/elixir/releases/download/v1.8.0/Precompiled.zip
+      wget https://github.com/elixir-lang/elixir/releases/download/v1.8.1/Precompiled.zip
       unzip -d /usr/local/elixir Precompiled.zip
       echo 'export PATH=/usr/local/elixir/bin:$PATH' >> $BASH_ENV
 
diff --git a/.tool-versions b/.tool-versions
index 6b69cd67..8cdc6ba7 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-erlang 21.3.6
+erlang 21.3.7
 elixir 1.8.1-otp-21