diff --git a/src/components/dashboard/navgan/show/form/UpdateForm.jsx b/src/components/dashboard/navgan/show/form/UpdateForm.jsx
index 955ccb1..871c9a2 100644
--- a/src/components/dashboard/navgan/show/form/UpdateForm.jsx
+++ b/src/components/dashboard/navgan/show/form/UpdateForm.jsx
@@ -393,7 +393,20 @@ const UpdateForm = ({LoanDetails, LoanId}) => {
                                         placeholder={t(
                                             "ShowLoan.text_field_enter_your_postal_code"
                                         )}
+                                        value={props.values.postal_code}
                                         type={'tel'}
+                                        onChange={(event) => {
+                                            const inputValue = event.target.value;
+                                            if (isNaN(Number(inputValue))) {
+                                                return;
+                                            }
+                                            props.handleChange({
+                                                target: {
+                                                    name: "postal_code",
+                                                    value: inputValue,
+                                                },
+                                            });
+                                        }}
                                         error={!!(props.touched.postal_code && props.errors.postal_code)}
                                         fullWidth
                                         helperText={
@@ -497,10 +510,21 @@ const UpdateForm = ({LoanDetails, LoanId}) => {
                                         sx={{width: "100%"}}
                                         name="telephone_number"
                                         variant="outlined"
-                                        type={'tel'}
                                         size="small"
+                                        type={'tel'}
                                         value={props.values.telephone_number}
-                                        onChange={props.handleChange}
+                                        onChange={(event) => {
+                                            const inputValue = event.target.value;
+                                            if (isNaN(Number(inputValue))) {
+                                                return;
+                                            }
+                                            props.handleChange({
+                                                target: {
+                                                    name: "telephone_number",
+                                                    value: inputValue,
+                                                },
+                                            });
+                                        }}
                                         label={t("ShowLoan.text_field_tel_number")}
                                         placeholder={t(
                                             "ShowLoan.text_field_enter_your_tel_number"