diff --git a/substrate/.gitignore b/substrate/.gitignore
index 44aa658e92..a7e0f6be3d 100644
--- a/substrate/.gitignore
+++ b/substrate/.gitignore
@@ -1,6 +1,7 @@
 /target/
 **/*.rs.bk
 *.swp
+.wasm-binaries
 polkadot/runtime/wasm/target/
 substrate/executor/wasm/target/
 substrate/test-runtime/wasm/target/
diff --git a/substrate/.travis.yml b/substrate/.travis.yml
index 0bcb209d84..33a20d3d62 100644
--- a/substrate/.travis.yml
+++ b/substrate/.travis.yml
@@ -14,3 +14,4 @@ matrix:
 script:
   - cargo check --all
   - cargo test --all
+  - ./publish-wasm.sh
diff --git a/substrate/publish-wasm.sh b/substrate/publish-wasm.sh
new file mode 100755
index 0000000000..cc4238a374
--- /dev/null
+++ b/substrate/publish-wasm.sh
@@ -0,0 +1,73 @@
+#!/bin/bash
+
+set -e
+
+REPO="github.com/paritytech/polkadot-wasm-bin.git"
+REPO_AUTH="${GH_TOKEN}:@${REPO}"
+SRCS=( "polkadot/runtime/wasm" "substrate/executor/wasm" "substrate/test-runtime/wasm" )
+DST=".wasm-binaries"
+TARGET="wasm32-unknown-unknown"
+UTCDATE=`date -u "+%Y%m%d.%H%M%S"`
+
+pushd .
+
+echo "*** Initilising WASM build environment"
+cd polkadot/runtime/wasm
+./init.sh || true
+cd ../../..
+
+for SRC in "${SRCS[@]}"
+do
+  echo "*** Building wasm binaries in $SRC"
+  cd $SRC
+  ./build.sh
+  cd ../../..
+done
+
+if [ "$TRAVIS_PULL_REQUEST" != "false" -o "$TRAVIS_BRANCH" != "master" ]; then
+  popd
+  echo "*** Skipping wasm binary publish"
+  exit 0
+fi
+
+echo "*** Cloning repo"
+rm -rf $DST
+git clone https://$REPO $DST
+cd $DST
+rm -rf $TARGET
+mkdir -p $TARGET
+
+echo "*** Setting up GH config"
+git config push.default simple
+git config merge.ours.driver true
+git config user.email "admin@parity.io"
+git config user.name "CI Build"
+git remote set-url origin https://$REPO_AUTH > /dev/null 2>&1
+
+for SRC in "${SRCS[@]}"
+do
+  echo "*** Copying wasm binaries from $SRC"
+  cp ../$SRC/target/$TARGET/release/*.wasm $TARGET
+done
+
+if [ -f "package.json" ]; then
+  echo "*** Updating package.json"
+  sed -i '.bak' "s/\"version\": \"[0-9.]*\"/\"version\": \"$UTCDATE\"/g" package.json
+  rm -rf package.json.bak
+fi
+
+echo "*** Adding to git"
+echo "$UTCDATE" > README.md
+git add --all .
+git commit -m "$UTCDATE"
+
+echo "*** Pushing upstream"
+git push --quiet origin HEAD:refs/heads/master > /dev/null 2>&1
+
+echo "*** Cleanup"
+cd ..
+rm -rf $DST
+popd
+
+echo "*** Completed"
+exit 0