diff --git a/schemas/v1.0/schema.yaml b/schemas/v1.0/schema.yaml
index 000bfa9..84223b1 100644
--- a/schemas/v1.0/schema.yaml
+++ b/schemas/v1.0/schema.yaml
@@ -37,6 +37,7 @@ $defs:
     $ref: "#/$defs/specification-extensions"
     unevaluatedProperties: false
   action-object:
+    type: object
     properties:
       target:
         type: string
diff --git a/schemas/v1.1/schema.yaml b/schemas/v1.1/schema.yaml
index c035fb7..641ebf8 100644
--- a/schemas/v1.1/schema.yaml
+++ b/schemas/v1.1/schema.yaml
@@ -39,6 +39,7 @@ $defs:
     $ref: "#/$defs/specification-extensions"
     unevaluatedProperties: false
   action-object:
+    type: object
     properties:
       target:
         type: string
diff --git a/schemas/v1.2-dev/schema.yaml b/schemas/v1.2-dev/schema.yaml
index 3669a8e..4891415 100644
--- a/schemas/v1.2-dev/schema.yaml
+++ b/schemas/v1.2-dev/schema.yaml
@@ -39,6 +39,7 @@ $defs:
     $ref: "#/$defs/specification-extensions"
     unevaluatedProperties: false
   action-object:
+    type: object
     properties:
       target:
         type: string
diff --git a/tests/v1.0/fail/actions-item-invalid-type.yaml b/tests/v1.0/fail/actions-item-invalid-type.yaml
new file mode 100644
index 0000000..662401b
--- /dev/null
+++ b/tests/v1.0/fail/actions-item-invalid-type.yaml
@@ -0,0 +1,6 @@
+overlay: 1.0.0
+info:
+  title: Action items must be objects
+  version: 1.0.0
+actions:
+  - 123
\ No newline at end of file
diff --git a/tests/v1.1/fail/actions-item-invalid-type.yaml b/tests/v1.1/fail/actions-item-invalid-type.yaml
new file mode 100644
index 0000000..a76326b
--- /dev/null
+++ b/tests/v1.1/fail/actions-item-invalid-type.yaml
@@ -0,0 +1,6 @@
+overlay: 1.1.0
+info:
+  title: Action items must be objects
+  version: 1.0.0
+actions:
+  - 123
\ No newline at end of file
diff --git a/tests/v1.2-dev/fail/action-target-invalid-type.yaml b/tests/v1.2-dev/fail/action-target-invalid-type.yaml
new file mode 100644
index 0000000..2254e9f
--- /dev/null
+++ b/tests/v1.2-dev/fail/action-target-invalid-type.yaml
@@ -0,0 +1,6 @@
+overlay: 1.2.0
+info:
+  title: Action target must be a string
+  version: 1.0.0
+actions:
+  - target: 100
\ No newline at end of file
diff --git a/tests/v1.2-dev/fail/actions-item-invalid-type.yaml b/tests/v1.2-dev/fail/actions-item-invalid-type.yaml
new file mode 100644
index 0000000..378fc74
--- /dev/null
+++ b/tests/v1.2-dev/fail/actions-item-invalid-type.yaml
@@ -0,0 +1,6 @@
+overlay: 1.2.0
+info:
+  title: Action items must be objects
+  version: 1.0.0
+actions:
+  - 123
\ No newline at end of file
diff --git a/tests/v1.2-dev/fail/overlay-invalid-pattern.yaml b/tests/v1.2-dev/fail/overlay-invalid-pattern.yaml
new file mode 100644
index 0000000..95d584a
--- /dev/null
+++ b/tests/v1.2-dev/fail/overlay-invalid-pattern.yaml
@@ -0,0 +1,6 @@
+overlay: '1.2'
+info:
+  title: Overlay version must match 1.2.x
+  version: 1.0.0
+actions:
+  - target: '$'
\ No newline at end of file