Index: trunk/src/org/openstreetmap/josm/io/CertificateAmendment.java
===================================================================
--- trunk/src/org/openstreetmap/josm/io/CertificateAmendment.java	(revision 14497)
+++ trunk/src/org/openstreetmap/josm/io/CertificateAmendment.java	(revision 14498)
@@ -162,4 +162,5 @@
      * Identifiers must match Windows/macOS keystore aliases and Unix filenames for efficient search.
      * To find correct values, see https://ccadb-public.secure.force.com/mozilla/IncludedCACertificateReport
+     * and https://support.apple.com/en-us/HT208127
      */
     private static final NativeCertAmend[] PLATFORM_CERT_AMEND = {
@@ -187,4 +188,8 @@
                 "e23d4a036d7b70e9f595b1422079d2b91edfbb1fb651a0633eaa8a9dc5f80703",
                 "https://eidas.disig.sk"),
+        // Government of Taiwan - https://grca.nat.gov.tw/GRCAeng/index.html
+        new NativeCertAmend("Government Root Certification Authority", "Government Root Certification Authority", "Taiwan_GRCA.pem",
+                "7600295eefe85b9e1fd624db76062aaaae59818a54d2774cd4c0b2c01131e1b3",
+                "https://grca.nat.gov.tw")
     };
 
Index: trunk/test/unit/org/openstreetmap/josm/io/CertificateAmendmentTestIT.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/io/CertificateAmendmentTestIT.java	(revision 14497)
+++ trunk/test/unit/org/openstreetmap/josm/io/CertificateAmendmentTestIT.java	(revision 14498)
@@ -81,4 +81,13 @@
     }
 
+    /**
+     * Test Taiwan government.
+     * @throws IOException in case of I/O error
+     */
+    @Test
+    public void testTaiwanGovernment() throws IOException {
+        connect("https://grca.nat.gov.tw", true);
+    }
+
     private static void connect(String url, boolean shouldWork) throws IOException {
         URLConnection connection = new URL(url).openConnection();