diff --git a/.evergreen/config.in.yml b/.evergreen/config.in.yml
index d33a23fc37a..2baf9fd132d 100644
--- a/.evergreen/config.in.yml
+++ b/.evergreen/config.in.yml
@@ -227,7 +227,10 @@ functions:
           # Get access to the AWS temporary credentials:
           echo "adding temporary AWS credentials to environment"
           # CSFLE_AWS_TEMP_ACCESS_KEY_ID, CSFLE_AWS_TEMP_SECRET_ACCESS_KEY, CSFLE_AWS_TEMP_SESSION_TOKEN
-          . "$DRIVERS_TOOLS"/.evergreen/csfle/set-temp-creds.sh
+          pushd "$DRIVERS_TOOLS"/.evergreen/csfle
+          . ./activate-kmstlsvenv.sh
+          . ./set-temp-creds.sh
+          popd
 
           MONGODB_URI="${MONGODB_URI}" \
           AUTH=${AUTH} SSL=${SSL} TEST_CSFLE=true \
diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index 140eb50e213..3fee70b6d8c 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -199,7 +199,10 @@ functions:
           # Get access to the AWS temporary credentials:
           echo "adding temporary AWS credentials to environment"
           # CSFLE_AWS_TEMP_ACCESS_KEY_ID, CSFLE_AWS_TEMP_SECRET_ACCESS_KEY, CSFLE_AWS_TEMP_SESSION_TOKEN
-          . "$DRIVERS_TOOLS"/.evergreen/csfle/set-temp-creds.sh
+          pushd "$DRIVERS_TOOLS"/.evergreen/csfle
+          . ./activate-kmstlsvenv.sh
+          . ./set-temp-creds.sh
+          popd
 
           MONGODB_URI="${MONGODB_URI}" \
           AUTH=${AUTH} SSL=${SSL} TEST_CSFLE=true \
diff --git a/.evergreen/run-custom-csfle-tests.sh b/.evergreen/run-custom-csfle-tests.sh
index 5b0a3c96855..787ef8bbba8 100644
--- a/.evergreen/run-custom-csfle-tests.sh
+++ b/.evergreen/run-custom-csfle-tests.sh
@@ -20,7 +20,10 @@ set -o errexit  # Exit the script with error if any of the commands fail
 # Get access to the AWS temporary credentials:
 echo "adding temporary AWS credentials to environment"
 # CSFLE_AWS_TEMP_ACCESS_KEY_ID, CSFLE_AWS_TEMP_SECRET_ACCESS_KEY, CSFLE_AWS_TEMP_SESSION_TOKEN
-. "$DRIVERS_TOOLS"/.evergreen/csfle/set-temp-creds.sh
+pushd "$DRIVERS_TOOLS"/.evergreen/csfle
+. ./activate-kmstlsvenv.sh
+. ./set-temp-creds.sh
+popd
 
 export MONGODB_URI=${MONGODB_URI}
 export KMIP_TLS_CA_FILE="${DRIVERS_TOOLS}/.evergreen/x509gen/ca.pem"
diff --git a/.evergreen/run-socks5-tests.sh b/.evergreen/run-socks5-tests.sh
index f0e146e7c6e..dac6a159e73 100644
--- a/.evergreen/run-socks5-tests.sh
+++ b/.evergreen/run-socks5-tests.sh
@@ -18,7 +18,10 @@ function setup_fle() {
   # Get access to the AWS temporary credentials:
   echo "adding temporary AWS credentials to environment"
   # CSFLE_AWS_TEMP_ACCESS_KEY_ID, CSFLE_AWS_TEMP_SECRET_ACCESS_KEY, CSFLE_AWS_TEMP_SESSION_TOKEN
-  . "$DRIVERS_TOOLS"/.evergreen/csfle/set-temp-creds.sh
+  pushd "$DRIVERS_TOOLS"/.evergreen/csfle
+  . ./activate-kmstlsvenv.sh
+  . ./set-temp-creds.sh
+  popd
 
   export KMIP_TLS_CA_FILE="${DRIVERS_TOOLS}/.evergreen/x509gen/ca.pem"
   export KMIP_TLS_CERT_FILE="${DRIVERS_TOOLS}/.evergreen/x509gen/client.pem"
diff --git a/.evergreen/run-tests.sh b/.evergreen/run-tests.sh
index 755732b9def..9bad420f7f3 100755
--- a/.evergreen/run-tests.sh
+++ b/.evergreen/run-tests.sh
@@ -45,11 +45,13 @@ if [[ -z "${CLIENT_ENCRYPTION}" ]]; then
   unset AWS_ACCESS_KEY_ID;
   unset AWS_SECRET_ACCESS_KEY;
 else
-  pip install --upgrade boto3
+  pushd "$DRIVERS_TOOLS/.evergreen/csfle"
+  . ./activate-kmstlsvenv.sh
   # Get access to the AWS temporary credentials:
   echo "adding temporary AWS credentials to environment"
   # CSFLE_AWS_TEMP_ACCESS_KEY_ID, CSFLE_AWS_TEMP_SECRET_ACCESS_KEY, CSFLE_AWS_TEMP_SESSION_TOKEN
-  source "$DRIVERS_TOOLS"/.evergreen/csfle/set-temp-creds.sh
+  source set-temp-creds.sh
+  popd
 fi
 
 npm install @mongodb-js/zstd
diff --git a/test/readme.md b/test/readme.md
index 40872c895c5..deae82a2deb 100644
--- a/test/readme.md
+++ b/test/readme.md
@@ -496,8 +496,8 @@ The following steps will walk you through how to run the tests for CSFLE.
 1. Set temporary AWS credentials
 
    ```
-   pip3 install boto3
-   PYTHON="python3" source /path/to/mongodb-labs/drivers-evergreen-tools/.evergreen/csfle/set-temp-creds.sh
+   source /path/to/mongodb-labs/drivers-evergreen-tools/.evergreen/csfle/activate-kmstlsvenv.sh
+   source /path/to/mongodb-labs/drivers-evergreen-tools/.evergreen/csfle/set-temp-creds.sh
    ```
 
    Alternatively, for fish users, the following script can be substituted for `set-temp-creds.sh`: