3 files changed, 3 insertions, 3 deletions
diff --git a/bin/problem-13.sh b/bin/problem-13.sh
index 9322cd2..1c431b8 100755
--- a/bin/problem-13.sh
+++ b/bin/problem-13.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 banner() {
   echo "Use one of the following options:"
diff --git a/bin/problem-6.sh b/bin/problem-6.sh
index e868c90..2eff10b 100755
--- a/bin/problem-6.sh
+++ b/bin/problem-6.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 validate_input() {
   invalid=0
diff --git a/bin/problem-7.sh b/bin/problem-7.sh
index 8ec6e0c..8cb15ce 100755
--- a/bin/problem-7.sh
+++ b/bin/problem-7.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 if [ $# -eq 0 ]; then
   echo "error: a hostname is required" >&2