diff --git a/dex/networks/eth/contracts/README.md b/dex/networks/eth/contracts/README.md
index 0d2e08feee..e8b099cef8 100644
--- a/dex/networks/eth/contracts/README.md
+++ b/dex/networks/eth/contracts/README.md
@@ -2,11 +2,7 @@
 
 Have `solc` and `abigen` installed on your system and run from this directory:
 
-`abigen --sol ETHSwapV{version}.sol --pkg eth --out ../contract.go`
-
-To generate the runtime bytecode, run from this directory:
-
-`./genruntime.sh {version}`
+`./updatecontract.sh {version}`
 
 ## History
 
diff --git a/dex/networks/eth/contracts/genruntime.sh b/dex/networks/eth/contracts/genruntime.sh
deleted file mode 100755
index 1d3cbd6a31..0000000000
--- a/dex/networks/eth/contracts/genruntime.sh
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/usr/bin/env bash
-# This script generates the runtime bytecoode for a solidity contract. It is used
-# to compare against the runtime bytecode on chain in order to verify that the
-# expected contract is deployed.
-
-if [ "$#" -ne 1 ]
-then
-  echo "Usage: $0 version" >&2
-  exit 1
-fi
-
-ETH_SWAP_VERSION=$1
-SOLIDITY_FILE=ETHSwapV${ETH_SWAP_VERSION}.sol
-if [ ! -f ./${SOLIDITY_FILE} ]
-then
-    echo "${SOLIDITY_FILE} does not exist" >&2
-    exit 1
-fi
-
-solc --bin-runtime --optimize ${SOLIDITY_FILE} -o .
-BYTECODE=$(<ETHSwap.bin-runtime)
-
-cat > "../BinRuntimeV${ETH_SWAP_VERSION}.go" <<EOF
-// Code generated - DO NOT EDIT.
-// This file is a generated binding and any manual changes will be lost.
-
-package eth
-
-const ETHSwapRuntimeBin = "${BYTECODE}"
-EOF
-
-rm ETHSwap.bin-runtime
\ No newline at end of file
diff --git a/dex/networks/eth/contracts/updatecontract.sh b/dex/networks/eth/contracts/updatecontract.sh
new file mode 100755
index 0000000000..5e1e5e9a1c
--- /dev/null
+++ b/dex/networks/eth/contracts/updatecontract.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# This script does 3 things:
+#
+# 1. Updates contract.go to reflect updated solidity code.
+# 2. Generates the runtime bytecoode. This is used to compare against the runtime
+#    bytecode on chain in order to verify that the expected contract is deployed.
+# 3. Updates the bytecode in the harness test.
+
+if [ "$#" -ne 1 ]
+then
+  echo "Usage: $0 version" >&2
+  exit 1
+fi
+
+ETH_SWAP_VERSION=$1
+SOLIDITY_FILE=ETHSwapV${ETH_SWAP_VERSION}.sol
+if [ ! -f ./${SOLIDITY_FILE} ]
+then
+    echo "${SOLIDITY_FILE} does not exist" >&2
+    exit 1
+fi
+
+solc --bin-runtime --optimize ${SOLIDITY_FILE} -o .
+BYTECODE=$(<ETHSwap.bin-runtime)
+
+cat > "../BinRuntimeV${ETH_SWAP_VERSION}.go" <<EOF
+// Code generated - DO NOT EDIT.
+// This file is a generated binding and any manual changes will be lost.
+
+package eth
+
+const ETHSwapRuntimeBin = "${BYTECODE}"
+EOF
+
+rm ETHSwap.bin-runtime
+
+abigen --sol ${SOLIDITY_FILE} --pkg eth --out ../contract.go
+
+solc --bin --optimize ${SOLIDITY_FILE} -o .
+BYTECODE=$(<ETHSwap.bin)
+sed -i.tmp "s/ETH_SWAP_V${ETH_SWAP_VERSION}=.*/ETH_SWAP_V${ETH_SWAP_VERSION}=\"${BYTECODE}\"/" ../../../testing/eth/harness.sh
+rm ../../../testing/eth/harness.sh.tmp
+rm ETHSwap.bin
\ No newline at end of file