diff --git a/.travis.yml b/.travis.yml
index 47c96d5..055f401 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -89,13 +89,27 @@ matrix:
     #- env: TEST_DIR=examples/embedded_linux
     #- env: TEST_DIR=examples/f3_stm32f30x
 
+addons:
+  apt:
+    packages:
+      - libcurl4-openssl-dev
+      - libelf-dev
+      - libdw-dev
+      - cmake
+      - gcc
+      - binutils-dev
+      - libiberty-dev
+
+
 before_install:
   - set -e
   - rustup self update
 
 
 install:
-  - cargo install cargo-travis || true
+  - cargo install cargo-update || echo "cargo-update already installed"
+  - cargo install cargo-travis || echo "cargo-travis already installed"
+  - cargo install-update -a # update outdated cached binaries
   - rustup override set nightly
   - rustup target add thumbv7m-none-eabi
   - rustup component add clippy-preview
@@ -114,8 +128,10 @@ script:
   # - cd examples/stm32f3discovery && cargo check --target thumbv7m-none-eabi && cd ../../
   #- cd ../f3_stm32f30x && cargo build
 
-after_success:
-  #- cargo doc-upload
+after_success: 
+# measure code coverage and upload to coveralls.io
+  - cargo coveralls
+#- cargo doc-upload