diff --git a/json-schema/registry.json b/json-schema/registry.json
index 655ffd942..dce3d9dea 100644
--- a/json-schema/registry.json
+++ b/json-schema/registry.json
@@ -264,10 +264,12 @@
           "type": "string"
         },
         "signer_workflow": {
-          "type": "string"
+          "type": "string",
+          "format": "regex"
         },
         "signer-workflow": {
-          "type": "string"
+          "type": "string",
+          "format": "regex"
         }
       },
       "additionalProperties": false,
diff --git a/pkg/config/registry/github_cli.go b/pkg/config/registry/github_cli.go
index 2da67b372..0cf176409 100644
--- a/pkg/config/registry/github_cli.go
+++ b/pkg/config/registry/github_cli.go
@@ -9,11 +9,11 @@ type GitHubArtifactAttestations struct {
 	PredicateType string `yaml:"predicate_type,omitempty" json:"predicate_type,omitempty"`
 	// SignerWorkflow2 specifies the expected GitHub Actions workflow for signing.
 	// See https://github.com/aquaproj/aqua/issues/3581
-	SignerWorkflow2 string `yaml:"signer_workflow,omitempty" json:"signer_workflow,omitempty"`
+	SignerWorkflow2 string `yaml:"signer_workflow,omitempty" json:"signer_workflow,omitempty" jsonschema:"format=regex"`
 	// SignerWorkflow3 is the deprecated field name for signer workflow.
 	//
 	// Deprecated: Use SignerWorkflow2 instead. This will be removed in aqua v3.
-	SignerWorkflow3 string `yaml:"signer-workflow,omitempty" json:"signer-workflow,omitempty"`
+	SignerWorkflow3 string `yaml:"signer-workflow,omitempty" json:"signer-workflow,omitempty" jsonschema:"format=regex"`
 }
 
 // SignerWorkflow returns the configured signer workflow.