diff --git a/tests/integration/testdata/buildcmd/PyLayer/requirements.txt b/tests/integration/testdata/buildcmd/PyLayer/requirements.txt
index bf8549f936..ce4af48039 100644
--- a/tests/integration/testdata/buildcmd/PyLayer/requirements.txt
+++ b/tests/integration/testdata/buildcmd/PyLayer/requirements.txt
@@ -1,6 +1,7 @@
 # These are some hard packages to build. Using them here helps us verify that building works on various platforms
 
-numpy~=1.15
+# NOTE: Fixing to <1.20.3 as numpy1.20.3 started to use a new wheel naming convention (PEP 600)
+numpy<1.20.3
 # `cryptography` has a dependency on `pycparser` which, for some reason doesn't build inside a Docker container.
 # Turning this off until we resolve this issue: https://github.com/awslabs/aws-lambda-builders/issues/29
 # cryptography~=2.4
diff --git a/tests/integration/testdata/buildcmd/PyLayerMake/requirements.txt b/tests/integration/testdata/buildcmd/PyLayerMake/requirements.txt
index bf8549f936..ce4af48039 100644
--- a/tests/integration/testdata/buildcmd/PyLayerMake/requirements.txt
+++ b/tests/integration/testdata/buildcmd/PyLayerMake/requirements.txt
@@ -1,6 +1,7 @@
 # These are some hard packages to build. Using them here helps us verify that building works on various platforms
 
-numpy~=1.15
+# NOTE: Fixing to <1.20.3 as numpy1.20.3 started to use a new wheel naming convention (PEP 600)
+numpy<1.20.3
 # `cryptography` has a dependency on `pycparser` which, for some reason doesn't build inside a Docker container.
 # Turning this off until we resolve this issue: https://github.com/awslabs/aws-lambda-builders/issues/29
 # cryptography~=2.4
diff --git a/tests/integration/testdata/buildcmd/Python/requirements.txt b/tests/integration/testdata/buildcmd/Python/requirements.txt
index bf8549f936..ce4af48039 100644
--- a/tests/integration/testdata/buildcmd/Python/requirements.txt
+++ b/tests/integration/testdata/buildcmd/Python/requirements.txt
@@ -1,6 +1,7 @@
 # These are some hard packages to build. Using them here helps us verify that building works on various platforms
 
-numpy~=1.15
+# NOTE: Fixing to <1.20.3 as numpy1.20.3 started to use a new wheel naming convention (PEP 600)
+numpy<1.20.3
 # `cryptography` has a dependency on `pycparser` which, for some reason doesn't build inside a Docker container.
 # Turning this off until we resolve this issue: https://github.com/awslabs/aws-lambda-builders/issues/29
 # cryptography~=2.4
diff --git a/tests/integration/testdata/buildcmd/PythonImage/requirements.txt b/tests/integration/testdata/buildcmd/PythonImage/requirements.txt
index bf8549f936..ce4af48039 100644
--- a/tests/integration/testdata/buildcmd/PythonImage/requirements.txt
+++ b/tests/integration/testdata/buildcmd/PythonImage/requirements.txt
@@ -1,6 +1,7 @@
 # These are some hard packages to build. Using them here helps us verify that building works on various platforms
 
-numpy~=1.15
+# NOTE: Fixing to <1.20.3 as numpy1.20.3 started to use a new wheel naming convention (PEP 600)
+numpy<1.20.3
 # `cryptography` has a dependency on `pycparser` which, for some reason doesn't build inside a Docker container.
 # Turning this off until we resolve this issue: https://github.com/awslabs/aws-lambda-builders/issues/29
 # cryptography~=2.4