diff --git a/pshtt/build_pshtt.sh b/pshtt/build_pshtt.sh
index 2112457..468e4fe 100755
--- a/pshtt/build_pshtt.sh
+++ b/pshtt/build_pshtt.sh
@@ -16,7 +16,7 @@ pip install --upgrade pip setuptools
 # Install domain-scan
 ###
 git clone https://github.com/18F/domain-scan
-pip install --upgrade -r domain-scan/requirements.txt
+pip install --upgrade -r domain-scan/lambda/requirements-lambda.txt
 
 ##
 # Force pip to install the latest pshtt from GitHub.
diff --git a/sslyze/build_sslyze.sh b/sslyze/build_sslyze.sh
index 3c2b211..67f96ca 100755
--- a/sslyze/build_sslyze.sh
+++ b/sslyze/build_sslyze.sh
@@ -21,7 +21,7 @@ pip install --upgrade sslyze==1.3.4
 # Install domain-scan
 ###
 git clone https://github.com/18F/domain-scan
-pip install --upgrade -r domain-scan/requirements.txt
+pip install --upgrade -r domain-scan/lambda/requirements-lambda.txt
 
 ###
 # Leave the Python virtual environment
diff --git a/trustymail/build_trustymail.sh b/trustymail/build_trustymail.sh
index b3d9be4..b981eca 100755
--- a/trustymail/build_trustymail.sh
+++ b/trustymail/build_trustymail.sh
@@ -22,7 +22,7 @@ pip install --upgrade \
 # Install domain-scan
 ###
 git clone https://github.com/18F/domain-scan
-pip install --upgrade -r domain-scan/requirements.txt
+pip install --upgrade -r domain-scan/lambda/requirements-lambda.txt
 
 ###
 # Leave the Python virtual environment