diff --git a/.travis.yml b/.travis.yml
index 5017523..b9f284d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,8 +16,15 @@ addons:
     update: true
 
 script:
-  - sudo apt-get install jpegoptim optipng -y
+  - sudo apt-get install jpegoptim -y
   - sudo bash install-webp.sh
+  - sudo bash install-optipng.sh
   - sudo cp optimize.sh /usr/local/bin/img-optimize
   - sudo chmod 755 /usr/local/bin/img-optimize
-  - /usr/local/bin/img-optimize --all
\ No newline at end of file
+  - /usr/local/bin/img-optimize --all
+  - /usr/local/bin/img-optimize -jpg -q
+  - /usr/local/bin/img-optimize --png -q
+  - rm images/*.webp
+  - /usr/local/bin/img-optimize --webp
+  - rm images/*.webp
+  - /usr/local/bin/img-optimize --webp --quiet
\ No newline at end of file
diff --git a/install-optipng.sh b/install-optipng.sh
index dce18f3..4bb3023 100644
--- a/install-optipng.sh
+++ b/install-optipng.sh
@@ -1,21 +1,22 @@
 #!/bin/bash
 
 # install prerequisites
-sudo apt-get install build-essential libpng-dev -y
+apt-get install build-essential libpng-dev zlib1g-dev curl pigz -y
 
 # go into /usr/local/src and remove previous optipng folder/archive
 cd /usr/local/src || exit 1
 rm -rf optipng*
 
 # get the latest optipng release link
-OPTIPNGLATEST=$(wget http://optipng.sourceforge.net/ -O - | grep tar.gz | awk -F '["]' '{print $4}')
+OPTIPNGLATEST=$(curl -sL optipng.sourceforge.net | grep tar.gz | awk -F '["]' '{print $4}')
 
 # download and extract optipng
 wget $OPTIPNGLATEST -O optipng.tar.gz
-tar -xf optipng.tar.gz
+tar -I pigz -xf optipng.tar.gz
 cd optipng-* || exit 1
 
 # configure and compile optipng
 ./configure --prefix=/usr
 make -j "$(nproc)"
-sudo make install
\ No newline at end of file
+strip --strip-unneeded /usr/local/src/optipng-*/src/optipng/optipng
+make install
\ No newline at end of file