diff --git a/dagger/maintenance/image.go b/dagger/maintenance/image.go
index 6b1ddb4..6ffc972 100644
--- a/dagger/maintenance/image.go
+++ b/dagger/maintenance/image.go
@@ -23,8 +23,10 @@ const (
 )
 
 const (
-	AnnotationImageSQLVersion = "io.cloudnativepg.image.sql.version"
-	AnnotationImageBaseName   = "io.cloudnativepg.image.base.name"
+	AnnotationImageSQLVersion  = "io.cloudnativepg.image.sql.version"
+	AnnotationImageBaseName    = "io.cloudnativepg.image.base.name"
+	AnnotationImageBasePgMajor = "io.cloudnativepg.image.base.pgmajor"
+	AnnotationImageBaseOS      = "io.cloudnativepg.image.base.os"
 )
 
 var SupportedDistributions = []string{
diff --git a/dagger/maintenance/main.go b/dagger/maintenance/main.go
index ae1a259..8c1d879 100644
--- a/dagger/maintenance/main.go
+++ b/dagger/maintenance/main.go
@@ -186,7 +186,28 @@ func (m *Maintenance) GenerateTestingValues(
 			targetExtensionImage, AnnotationImageSQLVersion)
 	}
 
-	extensionInfos, err := generateTestingValuesExtensions(ctx, source, metadata, targetExtensionImage, version, registryUsername, registryPassword)
+	distribution := annotations[AnnotationImageBaseOS]
+	if distribution == "" {
+		return nil, fmt.Errorf(
+			"extension image %s doesn't have an %q annotation or its value is empty",
+			targetExtensionImage, AnnotationImageBaseOS)
+	}
+
+	pgMajor, err := strconv.Atoi(annotations[AnnotationImageBasePgMajor])
+	if err != nil {
+		return nil, fmt.Errorf(
+			"extension image %s doesn't have an %q annotation or its value is not a number",
+			targetExtensionImage, AnnotationImageBasePgMajor)
+	}
+
+	imageLocator := ImageLocator{
+		ExtensionImage: targetExtensionImage,
+		PgMajor:        pgMajor,
+		SQLVersion:     version,
+		Distribution:   distribution,
+	}
+	extensionInfos, err := generateTestingValuesExtensions(ctx, source, metadata, imageLocator,
+		registryUsername, registryPassword)
 	if err != nil {
 		return nil, err
 	}
diff --git a/dagger/maintenance/testingvalues.go b/dagger/maintenance/testingvalues.go
index 6662b05..8285e67 100644
--- a/dagger/maintenance/testingvalues.go
+++ b/dagger/maintenance/testingvalues.go
@@ -37,17 +37,30 @@ type testingExtensionInfo struct {
 	CreateExtension bool
 }
 
-func generateTestingValuesExtensions(ctx context.Context, source *dagger.Directory, metadata *extensionMetadata,
-	extensionImage string, version string, registryUsername string, registryPassword *dagger.Secret) ([]*testingExtensionInfo, error) {
+type ImageLocator struct {
+	ExtensionImage string
+	PgMajor        int
+	SQLVersion     string
+	Distribution   string
+}
+
+func generateTestingValuesExtensions(
+	ctx context.Context,
+	source *dagger.Directory,
+	metadata *extensionMetadata,
+	imageLocator ImageLocator,
+	registryUsername string,
+	registryPassword *dagger.Secret,
+) ([]*testingExtensionInfo, error) {
 	var out []*testingExtensionInfo
-	configuration, err := generateExtensionConfiguration(metadata, extensionImage)
+	configuration, err := generateExtensionConfiguration(metadata, imageLocator.ExtensionImage)
 	if err != nil {
 		return nil, err
 	}
 	out = append(out, &testingExtensionInfo{
 		Configuration:   configuration,
 		SQLName:         metadata.SQLName,
-		Version:         version,
+		Version:         imageLocator.SQLVersion,
 		CreateExtension: metadata.CreateExtension,
 	})
 
@@ -64,7 +77,11 @@ func generateTestingValuesExtensions(ctx context.Context, source *dagger.Directo
 		if err != nil {
 			return nil, fmt.Errorf("failed to parse dependency metadata %q: %w", dep, err)
 		}
-		depConfiguration, err := generateExtensionConfiguration(depMetadata, "")
+		requiredExtensionImage, err := getExtensionImage(depMetadata, imageLocator.Distribution, imageLocator.PgMajor)
+		if err != nil {
+			return nil, err
+		}
+		depConfiguration, err := generateExtensionConfiguration(depMetadata, requiredExtensionImage)
 		if err != nil {
 			return nil, err
 		}