diff --git a/cmd/helm3.go b/cmd/helm3.go
index d2a6d617..dda15afc 100644
--- a/cmd/helm3.go
+++ b/cmd/helm3.go
@@ -127,10 +127,10 @@ func (d *diffCmd) template(isUpgrade bool) ([]byte, error) {
 	if d.insecureSkipTLSVerify {
 		flags = append(flags, "--insecure-skip-tls-verify")
 	}
-	// Helm automatically enable --reuse-values when there's no --set, --set-string, --set-values, --set-file present.
+	// Helm automatically enable --reuse-values when there's no --set, --set-string, --set-json, --set-values, --set-file present.
 	// Let's simulate that in helm-diff.
 	// See https://medium.com/@kcatstack/understand-helm-upgrade-flags-reset-values-reuse-values-6e58ac8f127e
-	shouldDefaultReusingValues := isUpgrade && len(d.values) == 0 && len(d.stringValues) == 0 && len(d.valueFiles) == 0 && len(d.fileValues) == 0
+	shouldDefaultReusingValues := isUpgrade && len(d.values) == 0 && len(d.stringValues) == 0 && len(d.jsonValues) == 0 && len(d.valueFiles) == 0 && len(d.fileValues) == 0
 	if (d.reuseValues || shouldDefaultReusingValues) && !d.resetValues && !d.dryRun {
 		tmpfile, err := os.CreateTemp("", "existing-values")
 		if err != nil {
@@ -150,6 +150,9 @@ func (d *diffCmd) template(isUpgrade bool) ([]byte, error) {
 	for _, stringValue := range d.stringValues {
 		flags = append(flags, "--set-string", stringValue)
 	}
+	for _, jsonValue := range d.jsonValues {
+		flags = append(flags, "--set-json", jsonValue)
+	}
 	for _, valueFile := range d.valueFiles {
 		if strings.TrimSpace(valueFile) == "-" {
 			bytes, err := io.ReadAll(os.Stdin)
diff --git a/cmd/upgrade.go b/cmd/upgrade.go
index 44b5a328..5a975f00 100644
--- a/cmd/upgrade.go
+++ b/cmd/upgrade.go
@@ -42,6 +42,7 @@ type diffCmd struct {
 	valueFiles               valueFiles
 	values                   []string
 	stringValues             []string
+	jsonValues               []string
 	fileValues               []string
 	reuseValues              bool
 	resetValues              bool
@@ -183,6 +184,7 @@ func newChartCommand() *cobra.Command {
 	f.VarP(&diff.valueFiles, "values", "f", "specify values in a YAML file (can specify multiple)")
 	f.StringArrayVar(&diff.values, "set", []string{}, "set values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)")
 	f.StringArrayVar(&diff.stringValues, "set-string", []string{}, "set STRING values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)")
+	f.StringArrayVar(&diff.jsonValues, "set-json", []string{}, "set JSON values on the command line (can specify multiple or separate values with commas: key1=jsonval1,key2=jsonval2)")
 	f.StringArrayVar(&diff.fileValues, "set-file", []string{}, "set values from respective files specified via the command line (can specify multiple or separate values with commas: key1=path1,key2=path2)")
 	f.BoolVar(&diff.reuseValues, "reuse-values", false, "reuse the last release's values and merge in any new values. If '--reset-values' is specified, this is ignored")
 	f.BoolVar(&diff.resetValues, "reset-values", false, "reset the values to the ones built into the chart and merge in any new values")