diff --git a/factory/test-project/Dockerfile b/factory/test-project/Dockerfile
index 8c41e3135d..bd692e866d 100644
--- a/factory/test-project/Dockerfile
+++ b/factory/test-project/Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_TEST_IMAGE
+ARG BASE_TEST_IMAGE='cypress/factory'
 
 FROM ${BASE_TEST_IMAGE}
 RUN echo "current user: $(whoami)"
diff --git a/factory/test-project/argsDefined.Dockerfile b/factory/test-project/argsDefined.Dockerfile
index c2a2765054..e5f89d0d5a 100644
--- a/factory/test-project/argsDefined.Dockerfile
+++ b/factory/test-project/argsDefined.Dockerfile
@@ -3,7 +3,7 @@ ARG CHROME_VERSION='126.0.6478.114-1'
 ARG EDGE_VERSION='126.0.2592.61-1'
 ARG FIREFOX_VERSION='128.0'
 
-ARG BASE_TEST_IMAGE
+ARG BASE_TEST_IMAGE='cypress/factory'
 
 FROM ${BASE_TEST_IMAGE}
 RUN echo "current user: $(whoami)"
diff --git a/factory/test-project/included-non-root-user.Dockerfile b/factory/test-project/included-non-root-user.Dockerfile
index ba98561529..0bc2729b12 100644
--- a/factory/test-project/included-non-root-user.Dockerfile
+++ b/factory/test-project/included-non-root-user.Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_TEST_IMAGE
+ARG BASE_TEST_IMAGE='cypress/factory'
 
 FROM ${BASE_TEST_IMAGE}
 RUN echo "current user: $(whoami)"
diff --git a/factory/test-project/included.Dockerfile b/factory/test-project/included.Dockerfile
index 63d6050e0b..2afa1da901 100644
--- a/factory/test-project/included.Dockerfile
+++ b/factory/test-project/included.Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_TEST_IMAGE
+ARG BASE_TEST_IMAGE='cypress/factory'
 
 FROM ${BASE_TEST_IMAGE}
 RUN echo "current user: $(whoami)"
diff --git a/factory/test-project/node-override-version.Dockerfile b/factory/test-project/node-override-version.Dockerfile
index 55733f0eb1..e39904f4b5 100644
--- a/factory/test-project/node-override-version.Dockerfile
+++ b/factory/test-project/node-override-version.Dockerfile
@@ -1,5 +1,5 @@
 ARG NODE_VERSION='18.17.1'
 
-ARG BASE_TEST_IMAGE
+ARG BASE_TEST_IMAGE='cypress/factory'
 
 FROM ${BASE_TEST_IMAGE}
diff --git a/factory/test-project/non-root-user.Dockerfile b/factory/test-project/non-root-user.Dockerfile
index 84e130696a..fb01d5b945 100644
--- a/factory/test-project/non-root-user.Dockerfile
+++ b/factory/test-project/non-root-user.Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_TEST_IMAGE
+ARG BASE_TEST_IMAGE='cypress/factory'
 
 FROM ${BASE_TEST_IMAGE}
 RUN echo "current user: $(whoami)"