diff --git a/.changes/unreleased/Feature-20240801-124310.yaml b/.changes/unreleased/Feature-20240801-124310.yaml
new file mode 100644
index 00000000..02238645
--- /dev/null
+++ b/.changes/unreleased/Feature-20240801-124310.yaml
@@ -0,0 +1,4 @@
+kind: Feature
+body: Add ability for 'opslevel_check_service_property' to target custom properties
+  of a service
+time: 2024-08-01T12:43:10.20199-05:00
diff --git a/examples/resources/opslevel_check_service_property/resource.tf b/examples/resources/opslevel_check_service_property/resource.tf
index f61407b7..a264ef3a 100644
--- a/examples/resources/opslevel_check_service_property/resource.tf
+++ b/examples/resources/opslevel_check_service_property/resource.tf
@@ -39,3 +39,18 @@ resource "opslevel_check_service_property" "example" {
   }
   notes = "Optional additional info on why this check is run or how to fix it"
 }
+
+resource "opslevel_check_service_property" "example2" {
+  name    = "foo2"
+  enabled = true
+  # To set a future enable date remove field 'enabled' and use 'enable_on'
+  # enable_on = "2022-05-23T14:14:18.782000Z"
+  category            = data.opslevel_rubric_category.security.id
+  level               = data.opslevel_rubric_level.bronze.id
+  property            = "custom_property"
+  property_definition = "my_custom_property"
+  predicate = {
+    type = "exists"
+  }
+  notes = "Optional additional info on why this check is run or how to fix it"
+}
diff --git a/opslevel/resource_opslevel_check_service_property.go b/opslevel/resource_opslevel_check_service_property.go
index 2777d3c1..64710b10 100644
--- a/opslevel/resource_opslevel_check_service_property.go
+++ b/opslevel/resource_opslevel_check_service_property.go
@@ -45,8 +45,9 @@ type CheckServicePropertyResourceModel struct {
 	Notes       types.String `tfsdk:"notes"`
 	Owner       types.String `tfsdk:"owner"`
 
-	Property  types.String `tfsdk:"property"`
-	Predicate types.Object `tfsdk:"predicate"`
+	Property           types.String `tfsdk:"property"`
+	PropertyDefinition types.String `tfsdk:"property_definition"`
+	Predicate          types.Object `tfsdk:"predicate"`
 }
 
 func NewCheckServicePropertyResourceModel(ctx context.Context, check opslevel.Check, planModel CheckServicePropertyResourceModel) CheckServicePropertyResourceModel {
@@ -74,6 +75,10 @@ func NewCheckServicePropertyResourceModel(ctx context.Context, check opslevel.Ch
 
 	stateModel.Property = RequiredStringValue(string(check.ServicePropertyCheckFragment.Property))
 
+	if check.ServicePropertyCheckFragment.PropertyDefinition != nil {
+		stateModel.PropertyDefinition = planModel.PropertyDefinition
+	}
+
 	if check.ServicePropertyCheckFragment.Predicate == nil {
 		stateModel.Predicate = types.ObjectNull(predicateType)
 	} else {
@@ -109,6 +114,10 @@ func (r *CheckServicePropertyResource) Schema(ctx context.Context, req resource.
 					stringvalidator.OneOf(opslevel.AllServicePropertyTypeEnum...),
 				},
 			},
+			"property_definition": schema.StringAttribute{
+				Description: "The alias of the property that the check will verify (e.g. the specific custom property).",
+				Optional:    true,
+			},
 			"predicate": PredicateSchema(),
 		}),
 	}
@@ -210,6 +219,9 @@ func (r *CheckServicePropertyResource) Create(ctx context.Context, req resource.
 	}
 
 	input.ServiceProperty = opslevel.ServicePropertyTypeEnum(planModel.Property.ValueString())
+	if !planModel.PropertyDefinition.IsNull() {
+		input.PropertyDefinition = opslevel.NewIdentifier(planModel.PropertyDefinition.ValueString())
+	}
 
 	// convert environment_predicate object to model from plan
 	predicateModel, diags := PredicateObjectToModel(ctx, planModel.Predicate)
@@ -260,9 +272,11 @@ func (r *CheckServicePropertyResource) Read(ctx context.Context, req resource.Re
 
 func (r *CheckServicePropertyResource) Update(ctx context.Context, req resource.UpdateRequest, resp *resource.UpdateResponse) {
 	var planModel CheckServicePropertyResourceModel
+	var stateModel CheckServicePropertyResourceModel
 
 	// Read Terraform plan data into the planModel
 	resp.Diagnostics.Append(req.Plan.Get(ctx, &planModel)...)
+	resp.Diagnostics.Append(req.State.Get(ctx, &stateModel)...)
 
 	if resp.Diagnostics.HasError() {
 		return
@@ -287,6 +301,11 @@ func (r *CheckServicePropertyResource) Update(ctx context.Context, req resource.
 	}
 
 	input.ServiceProperty = opslevel.RefOf(opslevel.ServicePropertyTypeEnum(planModel.Property.ValueString()))
+	if !planModel.PropertyDefinition.IsNull() {
+		input.PropertyDefinition = opslevel.NewIdentifier(planModel.PropertyDefinition.ValueString())
+	} else if !stateModel.PropertyDefinition.IsNull() {
+		input.PropertyDefinition = &opslevel.IdentifierInput{}
+	}
 
 	// convert environment_predicate object to model from plan
 	predicateModel, diags := PredicateObjectToModel(ctx, planModel.Predicate)
@@ -308,10 +327,10 @@ func (r *CheckServicePropertyResource) Update(ctx context.Context, req resource.
 		return
 	}
 
-	stateModel := NewCheckServicePropertyResourceModel(ctx, *data, planModel)
+	verifiedStateModel := NewCheckServicePropertyResourceModel(ctx, *data, planModel)
 
 	tflog.Trace(ctx, "updated a check service property resource")
-	resp.Diagnostics.Append(resp.State.Set(ctx, &stateModel)...)
+	resp.Diagnostics.Append(resp.State.Set(ctx, &verifiedStateModel)...)
 }
 
 func (r *CheckServicePropertyResource) Delete(ctx context.Context, req resource.DeleteRequest, resp *resource.DeleteResponse) {
diff --git a/submodules/opslevel-go b/submodules/opslevel-go
index 2a389626..40886719 160000
--- a/submodules/opslevel-go
+++ b/submodules/opslevel-go
@@ -1 +1 @@
-Subproject commit 2a389626af97bd93cddeef7f0455536e894c4f9a
+Subproject commit 408867194d2bb24daf1627d8cb759fdfc24f9089