diff --git a/tests/bundles/bionic-queens.yaml b/tests/bundles/bionic-queens.yaml
index 2d6c40fc..725c5a17 100644
--- a/tests/bundles/bionic-queens.yaml
+++ b/tests/bundles/bionic-queens.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/bionic-rocky.yaml b/tests/bundles/bionic-rocky.yaml
index d4f8f1f9..48bd95db 100644
--- a/tests/bundles/bionic-rocky.yaml
+++ b/tests/bundles/bionic-rocky.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/bionic-stein.yaml b/tests/bundles/bionic-stein.yaml
index 2bfe57d6..38e8e751 100644
--- a/tests/bundles/bionic-stein.yaml
+++ b/tests/bundles/bionic-stein.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/bionic-train.yaml b/tests/bundles/bionic-train.yaml
index 84dd23df..d4a469ae 100644
--- a/tests/bundles/bionic-train.yaml
+++ b/tests/bundles/bionic-train.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/bionic-ussuri.yaml b/tests/bundles/bionic-ussuri.yaml
index ada15ed5..cd4b504f 100644
--- a/tests/bundles/bionic-ussuri.yaml
+++ b/tests/bundles/bionic-ussuri.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/focal-ussuri.yaml b/tests/bundles/focal-ussuri.yaml
index 8bdbac30..7905e719 100644
--- a/tests/bundles/focal-ussuri.yaml
+++ b/tests/bundles/focal-ussuri.yaml
@@ -15,7 +15,8 @@ machines:
   5: {}
   6: {}
   7: {}
-  8: {}
+  8:
+    constraints: "mem=4G"
   9:
     constraints: "root-disk=20G mem=4G"
   10:
diff --git a/tests/bundles/focal-victoria.yaml b/tests/bundles/focal-victoria.yaml
index e6f00955..016eea6d 100644
--- a/tests/bundles/focal-victoria.yaml
+++ b/tests/bundles/focal-victoria.yaml
@@ -15,7 +15,8 @@ machines:
   5: {}
   6: {}
   7: {}
-  8: {}
+  8:
+    constraints: "mem=4G"
   9:
     constraints: "root-disk=20G mem=4G"
   10:
diff --git a/tests/bundles/focal-wallaby.yaml b/tests/bundles/focal-wallaby.yaml
index 56feece0..60e8dbc1 100644
--- a/tests/bundles/focal-wallaby.yaml
+++ b/tests/bundles/focal-wallaby.yaml
@@ -15,7 +15,8 @@ machines:
   5: {}
   6: {}
   7: {}
-  8: {}
+  8:
+    constraints: "mem=4G"
   9:
     constraints: "root-disk=20G mem=4G"
   10:
diff --git a/tests/bundles/groovy-victoria.yaml b/tests/bundles/groovy-victoria.yaml
index 1598b509..49a49cc1 100644
--- a/tests/bundles/groovy-victoria.yaml
+++ b/tests/bundles/groovy-victoria.yaml
@@ -15,7 +15,8 @@ machines:
   5: {}
   6: {}
   7: {}
-  8: {}
+  8:
+    constraints: "mem=4G"
   9:
     constraints: "root-disk=20G mem=4G"
   10:
diff --git a/tests/bundles/hirsute-wallaby.yaml b/tests/bundles/hirsute-wallaby.yaml
index 0a5a95aa..ab09ddad 100644
--- a/tests/bundles/hirsute-wallaby.yaml
+++ b/tests/bundles/hirsute-wallaby.yaml
@@ -15,7 +15,8 @@ machines:
   5: {}
   6: {}
   7: {}
-  8: {}
+  8:
+    constraints: "mem=4G"
   9:
     constraints: "root-disk=20G mem=4G"
   10:
diff --git a/tests/bundles/trusty-mitaka.yaml b/tests/bundles/trusty-mitaka.yaml
index e8d92eaa..5d3ac3cb 100644
--- a/tests/bundles/trusty-mitaka.yaml
+++ b/tests/bundles/trusty-mitaka.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/xenial-mitaka.yaml b/tests/bundles/xenial-mitaka.yaml
index d0cdefd1..f001d1d3 100644
--- a/tests/bundles/xenial-mitaka.yaml
+++ b/tests/bundles/xenial-mitaka.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/xenial-ocata.yaml b/tests/bundles/xenial-ocata.yaml
index c2616147..9073ff02 100644
--- a/tests/bundles/xenial-ocata.yaml
+++ b/tests/bundles/xenial-ocata.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/xenial-pike.yaml b/tests/bundles/xenial-pike.yaml
index 3d68818e..8103bc26 100644
--- a/tests/bundles/xenial-pike.yaml
+++ b/tests/bundles/xenial-pike.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8:
diff --git a/tests/bundles/xenial-queens.yaml b/tests/bundles/xenial-queens.yaml
index e32f7d26..7f236079 100644
--- a/tests/bundles/xenial-queens.yaml
+++ b/tests/bundles/xenial-queens.yaml
@@ -11,7 +11,8 @@ machines:
   3: {}
   4: {}
   5: {}
-  6: {}
+  6:
+    constraints: "mem=4G"
   7:
     constraints: "root-disk=20G mem=4G"
   8: