diff --git a/backends/btor/test_cells.sh b/backends/btor/test_cells.sh
index 0a011932d..f8bd79782 100755
--- a/backends/btor/test_cells.sh
+++ b/backends/btor/test_cells.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
diff --git a/backends/firrtl/test.sh b/backends/firrtl/test.sh
index fe7e3a329..dd675e917 100644
--- a/backends/firrtl/test.sh
+++ b/backends/firrtl/test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 
 cd ../../
diff --git a/backends/simplec/test00.sh b/backends/simplec/test00.sh
index ede757273..9895a97e4 100644
--- a/backends/simplec/test00.sh
+++ b/backends/simplec/test00.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 ../../yosys -p 'synth -top test; write_simplec -verbose -i8 test00_uut.c' test00_uut.v
 clang -o test00_tb test00_tb.c
diff --git a/backends/smt2/test_cells.sh b/backends/smt2/test_cells.sh
index 34adb7af3..3f84d65a2 100644
--- a/backends/smt2/test_cells.sh
+++ b/backends/smt2/test_cells.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
diff --git a/backends/smv/test_cells.sh b/backends/smv/test_cells.sh
index 145b9c33b..1347b7044 100644
--- a/backends/smv/test_cells.sh
+++ b/backends/smv/test_cells.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
diff --git a/libs/bigint/run-testsuite b/libs/bigint/run-testsuite
index ff7372916..8436ebda0 100755
--- a/libs/bigint/run-testsuite
+++ b/libs/bigint/run-testsuite
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 bad=
 
diff --git a/techlibs/ice40/tests/test_bram.sh b/techlibs/ice40/tests/test_bram.sh
index d4d641a9c..5c30db644 100644
--- a/techlibs/ice40/tests/test_bram.sh
+++ b/techlibs/ice40/tests/test_bram.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
diff --git a/techlibs/ice40/tests/test_dsp_map.sh b/techlibs/ice40/tests/test_dsp_map.sh
index 3f7f134e4..8523a4676 100644
--- a/techlibs/ice40/tests/test_dsp_map.sh
+++ b/techlibs/ice40/tests/test_dsp_map.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 
 for iter in {1..100}
diff --git a/techlibs/ice40/tests/test_dsp_model.sh b/techlibs/ice40/tests/test_dsp_model.sh
index 1e564d1b2..c79456f70 100644
--- a/techlibs/ice40/tests/test_dsp_model.sh
+++ b/techlibs/ice40/tests/test_dsp_model.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 sed 's/SB_MAC16/SB_MAC16_UUT/; /SB_MAC16_UUT/,/endmodule/ p; d;' < ../cells_sim.v > test_dsp_model_uut.v
 if [ ! -f "test_dsp_model_ref.v" ]; then
diff --git a/techlibs/ice40/tests/test_ffs.sh b/techlibs/ice40/tests/test_ffs.sh
index ff79ec534..438629c3e 100644
--- a/techlibs/ice40/tests/test_ffs.sh
+++ b/techlibs/ice40/tests/test_ffs.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 for CLKPOL in 0 1; do
 for ENABLE_EN in 0 1; do
diff --git a/techlibs/xilinx/tests/bram1.sh b/techlibs/xilinx/tests/bram1.sh
index 7451a1b3e..7e9936804 100644
--- a/techlibs/xilinx/tests/bram1.sh
+++ b/techlibs/xilinx/tests/bram1.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 
diff --git a/techlibs/xilinx/tests/bram2.sh b/techlibs/xilinx/tests/bram2.sh
index 5d9c84dac..5c18d30e2 100644
--- a/techlibs/xilinx/tests/bram2.sh
+++ b/techlibs/xilinx/tests/bram2.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 unisims=/opt/Xilinx/Vivado/2014.4/data/verilog/src/unisims
diff --git a/techlibs/xilinx/tests/test_dsp48_model.sh b/techlibs/xilinx/tests/test_dsp48_model.sh
index 9a73f9b0c..bd72572d5 100644
--- a/techlibs/xilinx/tests/test_dsp48_model.sh
+++ b/techlibs/xilinx/tests/test_dsp48_model.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 if [ -z $ISE_DIR ]; then
 	ISE_DIR=/opt/Xilinx/ISE/14.7
diff --git a/techlibs/xilinx/tests/test_dsp48a1_model.sh b/techlibs/xilinx/tests/test_dsp48a1_model.sh
index a14a78e72..02ce2fef9 100644
--- a/techlibs/xilinx/tests/test_dsp48a1_model.sh
+++ b/techlibs/xilinx/tests/test_dsp48a1_model.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 if [ -z $ISE_DIR ]; then
 	ISE_DIR=/opt/Xilinx/ISE/14.7
diff --git a/techlibs/xilinx/tests/test_dsp_model.sh b/techlibs/xilinx/tests/test_dsp_model.sh
index d005cd40c..b2a2bb445 100644
--- a/techlibs/xilinx/tests/test_dsp_model.sh
+++ b/techlibs/xilinx/tests/test_dsp_model.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 if [ -z $VIVADO_DIR ]; then
 	VIVADO_DIR=/opt/Xilinx/Vivado/2019.1
diff --git a/tests/aiger/run-test.sh b/tests/aiger/run-test.sh
index bcf2b964a..ca7339ff0 100755
--- a/tests/aiger/run-test.sh
+++ b/tests/aiger/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 
diff --git a/tests/arch/run-test.sh b/tests/arch/run-test.sh
index 5d923db56..a14b79509 100755
--- a/tests/arch/run-test.sh
+++ b/tests/arch/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 
diff --git a/tests/asicworld/run-test.sh b/tests/asicworld/run-test.sh
index c22ab6928..5131ed646 100755
--- a/tests/asicworld/run-test.sh
+++ b/tests/asicworld/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 OPTIND=1
 seed=""    # default to no seed specified
diff --git a/tests/blif/run-test.sh b/tests/blif/run-test.sh
index 44ce7e674..e9698386e 100755
--- a/tests/blif/run-test.sh
+++ b/tests/blif/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 for x in *.ys; do
   echo "Running $x.."
diff --git a/tests/bram/run-single.sh b/tests/bram/run-single.sh
index 429a79e3c..358423f32 100644
--- a/tests/bram/run-single.sh
+++ b/tests/bram/run-single.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 ../../yosys -qq -f verilog -p "proc; opt; memory -nomap -bram temp/brams_${2}.txt; opt -fast -full" \
 		-l temp/synth_${1}_${2}.log -o temp/synth_${1}_${2}.v temp/brams_${1}.v
diff --git a/tests/bram/run-test.sh b/tests/bram/run-test.sh
index d6ba0de43..37fc91d0e 100755
--- a/tests/bram/run-test.sh
+++ b/tests/bram/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # run this test many times:
 # MAKE="make -j8" time bash -c 'for ((i=0; i<100; i++)); do echo "-- $i --"; bash run-test.sh || exit 1; done'
diff --git a/tests/fmt/run-test.sh b/tests/fmt/run-test.sh
index 914a72347..6c5becd5f 100644
--- a/tests/fmt/run-test.sh
+++ b/tests/fmt/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
diff --git a/tests/fsm/run-test.sh b/tests/fsm/run-test.sh
index fbdcbf048..dc60c69c4 100755
--- a/tests/fsm/run-test.sh
+++ b/tests/fsm/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # run this test many times:
 # time bash -c 'for ((i=0; i<100; i++)); do echo "-- $i --"; bash run-test.sh || exit 1; done'
diff --git a/tests/hana/run-test.sh b/tests/hana/run-test.sh
index 878c80b3f..99be37f5e 100755
--- a/tests/hana/run-test.sh
+++ b/tests/hana/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 OPTIND=1
 seed=""    # default to no seed specified
diff --git a/tests/liberty/run-test.sh b/tests/liberty/run-test.sh
index 61f19b09b..19ce0667d 100755
--- a/tests/liberty/run-test.sh
+++ b/tests/liberty/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 for x in *.lib; do
diff --git a/tests/lut/run-test.sh b/tests/lut/run-test.sh
index f8964f146..a10559cac 100755
--- a/tests/lut/run-test.sh
+++ b/tests/lut/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 for x in *.v; do
   echo "Running $x.."
diff --git a/tests/memfile/run-test.sh b/tests/memfile/run-test.sh
index e43ddd093..db0ec54ee 100755
--- a/tests/memfile/run-test.sh
+++ b/tests/memfile/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 
diff --git a/tests/memlib/run-test.sh b/tests/memlib/run-test.sh
index abe88a6cb..5f230a03e 100755
--- a/tests/memlib/run-test.sh
+++ b/tests/memlib/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eu
 
 OPTIND=1
diff --git a/tests/memories/run-test.sh b/tests/memories/run-test.sh
index c65066a9c..4f1da7ce7 100755
--- a/tests/memories/run-test.sh
+++ b/tests/memories/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 
diff --git a/tests/opt/run-test.sh b/tests/opt/run-test.sh
index 2007cd6e4..74589dfeb 100755
--- a/tests/opt/run-test.sh
+++ b/tests/opt/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -eu
 source ../gen-tests-makefile.sh
 run_tests --yosys-scripts
diff --git a/tests/opt_share/run-test.sh b/tests/opt_share/run-test.sh
index e0008a259..e80cd4214 100755
--- a/tests/opt_share/run-test.sh
+++ b/tests/opt_share/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # run this test many times:
 # time bash -c 'for ((i=0; i<100; i++)); do echo "-- $i --"; bash run-test.sh || exit 1; done'
diff --git a/tests/proc/run-test.sh b/tests/proc/run-test.sh
index 44ce7e674..e9698386e 100755
--- a/tests/proc/run-test.sh
+++ b/tests/proc/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 for x in *.ys; do
   echo "Running $x.."
diff --git a/tests/realmath/run-test.sh b/tests/realmath/run-test.sh
index e1a36c694..833e8c3f4 100755
--- a/tests/realmath/run-test.sh
+++ b/tests/realmath/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 OPTIND=1
diff --git a/tests/rpc/run-test.sh b/tests/rpc/run-test.sh
index eeb309347..624043750 100755
--- a/tests/rpc/run-test.sh
+++ b/tests/rpc/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 for x in *.ys; do
   echo "Running $x.."
diff --git a/tests/select/run-test.sh b/tests/select/run-test.sh
index 44ce7e674..e9698386e 100755
--- a/tests/select/run-test.sh
+++ b/tests/select/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 for x in *.ys; do
   echo "Running $x.."
diff --git a/tests/share/run-test.sh b/tests/share/run-test.sh
index 1bcd8e423..a7b5fc4a0 100755
--- a/tests/share/run-test.sh
+++ b/tests/share/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # run this test many times:
 # time bash -c 'for ((i=0; i<100; i++)); do echo "-- $i --"; bash run-test.sh || exit 1; done'
diff --git a/tests/simple/run-test.sh b/tests/simple/run-test.sh
index 47bcfd6da..b9e79f34a 100755
--- a/tests/simple/run-test.sh
+++ b/tests/simple/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 OPTIND=1
 seed=""    # default to no seed specified
diff --git a/tests/simple_abc9/run-test.sh b/tests/simple_abc9/run-test.sh
index 4a5bf01a3..b75e54dd3 100755
--- a/tests/simple_abc9/run-test.sh
+++ b/tests/simple_abc9/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 OPTIND=1
 seed=""    # default to no seed specified
diff --git a/tests/smv/run-single.sh b/tests/smv/run-single.sh
index a261f4ea6..a0a6eba0a 100644
--- a/tests/smv/run-single.sh
+++ b/tests/smv/run-single.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 cat > $1.tpl <<EOT
 %module main
diff --git a/tests/smv/run-test.sh b/tests/smv/run-test.sh
index 74a54486d..c8264ac8a 100755
--- a/tests/smv/run-test.sh
+++ b/tests/smv/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
diff --git a/tests/sva/runtest.sh b/tests/sva/runtest.sh
index 2ecc9780c..84e797390 100644
--- a/tests/sva/runtest.sh
+++ b/tests/sva/runtest.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
diff --git a/tests/svinterfaces/run_simple.sh b/tests/svinterfaces/run_simple.sh
index bce994443..5bf044373 100755
--- a/tests/svinterfaces/run_simple.sh
+++ b/tests/svinterfaces/run_simple.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Run a simple test with a .ys file
 
diff --git a/tests/svinterfaces/runone.sh b/tests/svinterfaces/runone.sh
index 54cf5f2ec..2d6e0463d 100755
--- a/tests/svinterfaces/runone.sh
+++ b/tests/svinterfaces/runone.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 
 TESTNAME=$1
diff --git a/tests/techmap/mem_simple_4x1_runtest.sh b/tests/techmap/mem_simple_4x1_runtest.sh
index 5b5838b9d..d7738aafb 100644
--- a/tests/techmap/mem_simple_4x1_runtest.sh
+++ b/tests/techmap/mem_simple_4x1_runtest.sh
@@ -1,3 +1,3 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 exec ../tools/autotest.sh -G -j $@ -p 'proc; opt; memory -nomap; techmap -map ../mem_simple_4x1_map.v;; techmap; opt; abc;; stat' mem_simple_4x1_uut.v
diff --git a/tests/various/async.sh b/tests/various/async.sh
index e83935d02..9d956c1cd 100644
--- a/tests/various/async.sh
+++ b/tests/various/async.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 ../../yosys -q -o async_syn.v -r uut -p 'synth; rename uut syn' async.v
 ../../yosys -q -o async_prp.v -r uut -p 'prep; rename uut prp' async.v
diff --git a/tests/various/chparam.sh b/tests/various/chparam.sh
index 9bb8d81db..d7712b807 100644
--- a/tests/various/chparam.sh
+++ b/tests/various/chparam.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 trap 'echo "ERROR in chparam.sh" >&2; exit 1' ERR
 
diff --git a/tests/various/logger_fail.sh b/tests/various/logger_fail.sh
index 19b650007..c318b648d 100755
--- a/tests/various/logger_fail.sh
+++ b/tests/various/logger_fail.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 fail() {
 	echo "$1" >&2
diff --git a/tests/various/smtlib2_module.sh b/tests/various/smtlib2_module.sh
index 491f65148..a2206eea7 100755
--- a/tests/various/smtlib2_module.sh
+++ b/tests/various/smtlib2_module.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 ../../yosys -q -p 'read_verilog -formal smtlib2_module.v; prep; write_smt2 smtlib2_module.smt2'
 sed 's/; SMT-LIBv2 description generated by Yosys .*/; SMT-LIBv2 description generated by Yosys $VERSION/;s/  *$//' smtlib2_module.smt2 > smtlib2_module-filtered.smt2
diff --git a/tests/various/sv_implicit_ports.sh b/tests/various/sv_implicit_ports.sh
index 9a01447f7..5266fffe5 100755
--- a/tests/various/sv_implicit_ports.sh
+++ b/tests/various/sv_implicit_ports.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 trap 'echo "ERROR in sv_implicit_ports.sh" >&2; exit 1' ERR
 
diff --git a/tests/various/svalways.sh b/tests/various/svalways.sh
index 2cc09f801..7765907c7 100755
--- a/tests/various/svalways.sh
+++ b/tests/various/svalways.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 trap 'echo "ERROR in svalways.sh" >&2; exit 1' ERR
 
diff --git a/tests/verilog/dynamic_range_lhs.sh b/tests/verilog/dynamic_range_lhs.sh
index 618204aed..77b4a2918 100755
--- a/tests/verilog/dynamic_range_lhs.sh
+++ b/tests/verilog/dynamic_range_lhs.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 run() {
     alt=$1
diff --git a/tests/vloghtb/run-test.sh b/tests/vloghtb/run-test.sh
index 3c0689619..29f7c2680 100755
--- a/tests/vloghtb/run-test.sh
+++ b/tests/vloghtb/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -ex
 
diff --git a/tests/vloghtb/test_febe.sh b/tests/vloghtb/test_febe.sh
index 482d44d9a..af0fe1b98 100644
--- a/tests/vloghtb/test_febe.sh
+++ b/tests/vloghtb/test_febe.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 source common.sh
diff --git a/tests/vloghtb/test_mapopt.sh b/tests/vloghtb/test_mapopt.sh
index 61528c2b4..c76e036a3 100644
--- a/tests/vloghtb/test_mapopt.sh
+++ b/tests/vloghtb/test_mapopt.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 source common.sh
diff --git a/tests/vloghtb/test_share.sh b/tests/vloghtb/test_share.sh
index 67cfe44e8..87fac67fe 100644
--- a/tests/vloghtb/test_share.sh
+++ b/tests/vloghtb/test_share.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 source common.sh
diff --git a/tests/xprop/run-test.sh b/tests/xprop/run-test.sh
index db4b7ca82..84b7c4ac4 100755
--- a/tests/xprop/run-test.sh
+++ b/tests/xprop/run-test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 python3 generate.py $@