diff --git a/tests/draft-next/optional/format/hostname.json b/tests/draft-next/optional/format/hostname.json
index f4819efa..bc3a60dc 100644
--- a/tests/draft-next/optional/format/hostname.json
+++ b/tests/draft-next/optional/format/hostname.json
@@ -125,6 +125,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft-next/optional/format/idn-hostname.json b/tests/draft-next/optional/format/idn-hostname.json
index 9abe2d93..fa348fe6 100644
--- a/tests/draft-next/optional/format/idn-hostname.json
+++ b/tests/draft-next/optional/format/idn-hostname.json
@@ -331,6 +331,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2019-09/optional/format/hostname.json b/tests/draft2019-09/optional/format/hostname.json
index 9db7c967..24bfdfc5 100644
--- a/tests/draft2019-09/optional/format/hostname.json
+++ b/tests/draft2019-09/optional/format/hostname.json
@@ -125,6 +125,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2019-09/optional/format/idn-hostname.json b/tests/draft2019-09/optional/format/idn-hostname.json
index 05bff0df..3e0b6497 100644
--- a/tests/draft2019-09/optional/format/idn-hostname.json
+++ b/tests/draft2019-09/optional/format/idn-hostname.json
@@ -331,6 +331,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2020-12/optional/format/hostname.json b/tests/draft2020-12/optional/format/hostname.json
index 0e00af2c..57827c4d 100644
--- a/tests/draft2020-12/optional/format/hostname.json
+++ b/tests/draft2020-12/optional/format/hostname.json
@@ -125,6 +125,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2020-12/optional/format/idn-hostname.json b/tests/draft2020-12/optional/format/idn-hostname.json
index 30a0f494..eb91b5a4 100644
--- a/tests/draft2020-12/optional/format/idn-hostname.json
+++ b/tests/draft2020-12/optional/format/idn-hostname.json
@@ -331,6 +331,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft4/optional/format/hostname.json b/tests/draft4/optional/format/hostname.json
index d7c72a7f..866a6178 100644
--- a/tests/draft4/optional/format/hostname.json
+++ b/tests/draft4/optional/format/hostname.json
@@ -117,6 +117,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft6/optional/format/hostname.json b/tests/draft6/optional/format/hostname.json
index d7c72a7f..866a6178 100644
--- a/tests/draft6/optional/format/hostname.json
+++ b/tests/draft6/optional/format/hostname.json
@@ -117,6 +117,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft7/optional/format/hostname.json b/tests/draft7/optional/format/hostname.json
index d7c72a7f..866a6178 100644
--- a/tests/draft7/optional/format/hostname.json
+++ b/tests/draft7/optional/format/hostname.json
@@ -117,6 +117,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft7/optional/format/idn-hostname.json b/tests/draft7/optional/format/idn-hostname.json
index 068470ea..0fe07e1e 100644
--- a/tests/draft7/optional/format/idn-hostname.json
+++ b/tests/draft7/optional/format/idn-hostname.json
@@ -323,6 +323,11 @@
                 "description": "empty string",
                 "data": "",
                 "valid": false
+            },
+            {
+                "description": "single dot",
+                "data": ".",
+                "valid": false
             }
         ]
     }