diff --git a/assets/create.sh b/assets/create.sh
index 1a639649..a4a8aa04 100755
--- a/assets/create.sh
+++ b/assets/create.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -euo pipefail
 
 ASSET_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
diff --git a/tests/benchmarks/comparison.sh b/tests/benchmarks/comparison.sh
old mode 100644
new mode 100755
index 50438cf4..c9eb5237
--- a/tests/benchmarks/comparison.sh
+++ b/tests/benchmarks/comparison.sh
@@ -1,4 +1,6 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
+cd "$(dirname "${BASH_SOURCE[0]}")"
 
 if ! which hyperfine > /dev/null 2>&1; then
     echo "'hyperfine' does not seem to be installed."
diff --git a/tests/benchmarks/run-benchmarks.sh b/tests/benchmarks/run-benchmarks.sh
old mode 100644
new mode 100755
index 252c3008..c3a15509
--- a/tests/benchmarks/run-benchmarks.sh
+++ b/tests/benchmarks/run-benchmarks.sh
@@ -1,4 +1,6 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
+cd "$(dirname "${BASH_SOURCE[0]}")"
 
 if ! which hyperfine > /dev/null 2>&1; then
     echo "'hyperfine' does not seem to be installed."
diff --git a/tests/syntax-tests/regression_test.sh b/tests/syntax-tests/regression_test.sh
index 55e398c4..25acb256 100755
--- a/tests/syntax-tests/regression_test.sh
+++ b/tests/syntax-tests/regression_test.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -eou pipefail
 
diff --git a/tests/syntax-tests/update.sh b/tests/syntax-tests/update.sh
index 7ce66588..b4752f05 100755
--- a/tests/syntax-tests/update.sh
+++ b/tests/syntax-tests/update.sh
@@ -1,4 +1,6 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
+cd "$(dirname "${BASH_SOURCE[0]}")"
 
 python="python3"
 if ! command -v python3 &>/dev/null; then python="python"; fi