diff --git a/.evergreen/ensure-binary.sh b/.evergreen/ensure-binary.sh
index 6f28ef6b..0d1da7c4 100755
--- a/.evergreen/ensure-binary.sh
+++ b/.evergreen/ensure-binary.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Ensure the given binary is on the PATH.
 # Should be called as:
diff --git a/.evergreen/handle-paths.sh b/.evergreen/handle-paths.sh
index 599f9ed8..57256a59 100755
--- a/.evergreen/handle-paths.sh
+++ b/.evergreen/handle-paths.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 #
 # This script will handle the correct cross-platform absolute
 # paths for a script directory and DRIVERS_TOOLS.
diff --git a/.evergreen/ocsp/ecdsa/mock-delegate-revoked.sh b/.evergreen/ocsp/ecdsa/mock-delegate-revoked.sh
index 1e40fba5..9aa08683 100755
--- a/.evergreen/ocsp/ecdsa/mock-delegate-revoked.sh
+++ b/.evergreen/ocsp/ecdsa/mock-delegate-revoked.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 python3 ../ocsp_mock.py \
   --ca_file ca.pem \
   --ocsp_responder_cert ocsp-responder.crt \
diff --git a/.evergreen/ocsp/ecdsa/mock-delegate-valid.sh b/.evergreen/ocsp/ecdsa/mock-delegate-valid.sh
index 5074a7ec..b66ab99b 100755
--- a/.evergreen/ocsp/ecdsa/mock-delegate-valid.sh
+++ b/.evergreen/ocsp/ecdsa/mock-delegate-valid.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 python3 ../ocsp_mock.py \
   --ca_file ca.pem \
   --ocsp_responder_cert ocsp-responder.crt \
diff --git a/.evergreen/ocsp/ecdsa/mock-revoked.sh b/.evergreen/ocsp/ecdsa/mock-revoked.sh
index 684aacf1..2792ef17 100755
--- a/.evergreen/ocsp/ecdsa/mock-revoked.sh
+++ b/.evergreen/ocsp/ecdsa/mock-revoked.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 # Use the CA as the OCSP responder
 python3 ../ocsp_mock.py \
   --ca_file ca.pem \
diff --git a/.evergreen/ocsp/ecdsa/mock-valid.sh b/.evergreen/ocsp/ecdsa/mock-valid.sh
index c89ce9e9..18fcce41 100755
--- a/.evergreen/ocsp/ecdsa/mock-valid.sh
+++ b/.evergreen/ocsp/ecdsa/mock-valid.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 python3 ../ocsp_mock.py \
   --ca_file ca.pem \
   --ocsp_responder_cert ca.crt \
diff --git a/.evergreen/ocsp/rsa/mock-delegate-revoked.sh b/.evergreen/ocsp/rsa/mock-delegate-revoked.sh
index adf026ce..179d3447 100755
--- a/.evergreen/ocsp/rsa/mock-delegate-revoked.sh
+++ b/.evergreen/ocsp/rsa/mock-delegate-revoked.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 python3 ../ocsp_mock.py \
   --ca_file ca.pem \
   --ocsp_responder_cert ocsp_responder.crt \
diff --git a/.evergreen/ocsp/rsa/mock-delegate-valid.sh b/.evergreen/ocsp/rsa/mock-delegate-valid.sh
index 5074a7ec..b66ab99b 100755
--- a/.evergreen/ocsp/rsa/mock-delegate-valid.sh
+++ b/.evergreen/ocsp/rsa/mock-delegate-valid.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 python3 ../ocsp_mock.py \
   --ca_file ca.pem \
   --ocsp_responder_cert ocsp-responder.crt \
diff --git a/.evergreen/ocsp/rsa/mock-revoked.sh b/.evergreen/ocsp/rsa/mock-revoked.sh
index 4a17926b..968881c0 100755
--- a/.evergreen/ocsp/rsa/mock-revoked.sh
+++ b/.evergreen/ocsp/rsa/mock-revoked.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 python3 ../ocsp_mock.py \
   --ca_file ca.pem \
   --ocsp_responder_cert ca.crt \
diff --git a/.evergreen/ocsp/rsa/mock-valid.sh b/.evergreen/ocsp/rsa/mock-valid.sh
index c89ce9e9..18fcce41 100755
--- a/.evergreen/ocsp/rsa/mock-valid.sh
+++ b/.evergreen/ocsp/rsa/mock-valid.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 python3 ../ocsp_mock.py \
   --ca_file ca.pem \
   --ocsp_responder_cert ca.crt \
diff --git a/.evergreen/run-orchestration.sh b/.evergreen/run-orchestration.sh
index 026f110e..970f4a67 100755
--- a/.evergreen/run-orchestration.sh
+++ b/.evergreen/run-orchestration.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 set -o errexit  # Exit the script with error if any of the commands fail
 
 # Supported environment variables:
diff --git a/.evergreen/stop-orchestration.sh b/.evergreen/stop-orchestration.sh
index d1883a4a..4e67600f 100755
--- a/.evergreen/stop-orchestration.sh
+++ b/.evergreen/stop-orchestration.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 set -o errexit  # Exit the script with error if any of the commands fail
 
 cd "$MONGO_ORCHESTRATION_HOME"