diff --git a/tools/ab_compare.sh b/tools/ab_compare.sh
index 8cbe3fae..fdd4f798 100755
--- a/tools/ab_compare.sh
+++ b/tools/ab_compare.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 USAGE=\
diff --git a/tools/ab_compare_daala.sh b/tools/ab_compare_daala.sh
index 61d28478..f7be2da6 100755
--- a/tools/ab_compare_daala.sh
+++ b/tools/ab_compare_daala.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 while getopts 's:v:bk:d:E:D:y:n:' OPTIONS; do
diff --git a/tools/ab_compare_jpeg.sh b/tools/ab_compare_jpeg.sh
index 923d15a2..577785ab 100755
--- a/tools/ab_compare_jpeg.sh
+++ b/tools/ab_compare_jpeg.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 while getopts 's:d:J:j:Y:y:n:' OPTIONS; do
diff --git a/tools/ab_compare_libvpx.sh b/tools/ab_compare_libvpx.sh
index e97b1d84..d17f1161 100755
--- a/tools/ab_compare_libvpx.sh
+++ b/tools/ab_compare_libvpx.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 while getopts 's:c:k:r:E:D:d:Y:y:n:' OPTIONS; do
diff --git a/tools/ab_compare_x264.sh b/tools/ab_compare_x264.sh
index f33fc528..68596203 100755
--- a/tools/ab_compare_x264.sh
+++ b/tools/ab_compare_x264.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 while getopts 's:k:r:d:Y:y:n:' OPTIONS; do
diff --git a/tools/ab_compare_x265.sh b/tools/ab_compare_x265.sh
index a348a3dd..0fcc090d 100755
--- a/tools/ab_compare_x265.sh
+++ b/tools/ab_compare_x265.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 while getopts 's:k:r:d:Y:n:' OPTIONS; do
diff --git a/tools/bd_rate.sh b/tools/bd_rate.sh
index 805a2710..ee946d9d 100755
--- a/tools/bd_rate.sh
+++ b/tools/bd_rate.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 if [ $# == 0 ]; then
diff --git a/tools/check_lossless.sh b/tools/check_lossless.sh
index d67f0d14..c5f224c0 100755
--- a/tools/check_lossless.sh
+++ b/tools/check_lossless.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 if [ $# == 0 ]; then
diff --git a/tools/collect_mvf_ec.sh b/tools/collect_mvf_ec.sh
index 107796f4..f5291659 100755
--- a/tools/collect_mvf_ec.sh
+++ b/tools/collect_mvf_ec.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 set -e
 
diff --git a/tools/rd_average.sh b/tools/rd_average.sh
index dac7470c..4fe8cae5 100755
--- a/tools/rd_average.sh
+++ b/tools/rd_average.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 if [ $# == 0 ]; then
   echo "usage: OUTPUT=<label> $0 *.out"
diff --git a/tools/rd_collect.sh b/tools/rd_collect.sh
index dde7527f..9652524c 100755
--- a/tools/rd_collect.sh
+++ b/tools/rd_collect.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 CODECS="<daala|vp8|vp9|x264|x265|libjpeg|mozjpeg|theora>"
diff --git a/tools/rd_collect_daala.sh b/tools/rd_collect_daala.sh
index d41d3d21..c6702935 100755
--- a/tools/rd_collect_daala.sh
+++ b/tools/rd_collect_daala.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 if [ -z $RD_COLLECT_SUB ]; then
diff --git a/tools/rd_collect_jpeg.sh b/tools/rd_collect_jpeg.sh
index e327a9a3..f9dd8085 100755
--- a/tools/rd_collect_jpeg.sh
+++ b/tools/rd_collect_jpeg.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 if [ -z $RD_COLLECT_SUB ]; then
diff --git a/tools/rd_collect_libvpx.sh b/tools/rd_collect_libvpx.sh
index 872d22ac..a9521e83 100755
--- a/tools/rd_collect_libvpx.sh
+++ b/tools/rd_collect_libvpx.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 if [ -z $RD_COLLECT_SUB ]; then
diff --git a/tools/rd_collect_theora.sh b/tools/rd_collect_theora.sh
index b75c999f..6793544a 100755
--- a/tools/rd_collect_theora.sh
+++ b/tools/rd_collect_theora.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 if [ -z $RD_COLLECT_SUB ]; then
diff --git a/tools/rd_collect_x264.sh b/tools/rd_collect_x264.sh
index 278de288..fdb79b22 100755
--- a/tools/rd_collect_x264.sh
+++ b/tools/rd_collect_x264.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 if [ -z $RD_COLLECT_SUB ]; then
diff --git a/tools/rd_collect_x265.sh b/tools/rd_collect_x265.sh
index 0ae194a7..2d2efb0d 100755
--- a/tools/rd_collect_x265.sh
+++ b/tools/rd_collect_x265.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 if [ -z $RD_COLLECT_SUB ]; then
diff --git a/tools/rd_plot.sh b/tools/rd_plot.sh
index 6ecd2dbe..d1876b19 100755
--- a/tools/rd_plot.sh
+++ b/tools/rd_plot.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 set -e
 
 # Use this to average data from multiple runs
diff --git a/tools/upload_commits.sh b/tools/upload_commits.sh
index 4a7e3b18..a07e8f32 100755
--- a/tools/upload_commits.sh
+++ b/tools/upload_commits.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # USAGE: upload_commits.sh <num_commits> [<upload.py ARGS>]
 # NOTE: -y and --send_mail are automatically passed to upload.py
diff --git a/update_version b/update_version
index a9999918..877109de 100755
--- a/update_version
+++ b/update_version
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # Creates and updates the package_version information used by configure.ac
 # (or other makefiles).  When run inside a git repository it will use the