diff --git a/Cargo.lock b/Cargo.lock
index c8e5ab1..5d9a0fc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -127,7 +127,7 @@ dependencies = [
 
 [[package]]
 name = "folgezettel"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "camino",
  "clap",
diff --git a/flake.lock b/flake.lock
index 116c022..dc81f36 100644
--- a/flake.lock
+++ b/flake.lock
@@ -34,34 +34,13 @@
         "type": "github"
       }
     },
-    "gitignore": {
-      "inputs": {
-        "nixpkgs": [
-          "pre-commit-hooks",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1709087332,
-        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1781509190,
-        "narHash": "sha256-uJZs9Di8I6ciTp6jiojj0HzlNpBkud8ax5aT/O5aJkw=",
+        "lastModified": 1782847189,
+        "narHash": "sha256-twXPFqFsrrY5r28Zh7Homgcp2gUMBgQ6WDS98Q/3xFI=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "d6df3513510aa548c83868fd22bfddd0a8c0a0d4",
+        "rev": "b6018f87da91d19d0ab4cf979885689b469cdd41",
         "type": "github"
       },
       "original": {
@@ -73,11 +52,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1770073757,
-        "narHash": "sha256-Vy+G+F+3E/Tl+GMNgiHl9Pah2DgShmIUBJXmbiQPHbI=",
+        "lastModified": 1782918843,
+        "narHash": "sha256-ETYnV9U7Sr+A45dohzZdfCZKOss4qrTkO+wgNZNvEc0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "47472570b1e607482890801aeaf29bfb749884f6",
+        "rev": "e8273b29fe1390ec8d4603f2477357555291432e",
         "type": "github"
       },
       "original": {
@@ -106,15 +85,14 @@
     "pre-commit-hooks": {
       "inputs": {
         "flake-compat": "flake-compat",
-        "gitignore": "gitignore",
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1778507602,
-        "narHash": "sha256-kTwur1wV+01SdqskVMSo6JMEpg71ps3HpbFY2GsflKs=",
+        "lastModified": 1784288435,
+        "narHash": "sha256-ReRHaLgr/uVqdD8afFSn+myXIfpHeOhP0yYe0TJqAA8=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "61ab0e80d9c7ab14c256b5b453d8b3fb0189ba0a",
+        "rev": "43b3c1ab9d40fb1dbb008f451988a91e375825e9",
         "type": "github"
       },
       "original": {
@@ -151,11 +129,11 @@
         "nixpkgs": "nixpkgs_3"
       },
       "locked": {
-        "lastModified": 1780220602,
-        "narHash": "sha256-eynAfOmbmxJnkp7YewvCEbShNnnYJ9gLLqkzsYtBPeM=",
+        "lastModified": 1784369104,
+        "narHash": "sha256-47cxbcZODibHv3rELFQ9vZly0vUNkND/atn/U7HLeb0=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "db947814a175b7ca6ded66e21383d938df01c227",
+        "rev": "df3c0640565d04a0261253cdd89fce78ec50168a",
         "type": "github"
       },
       "original": {
diff --git a/src/id.rs b/src/id.rs
index ac3ca99..fff4a77 100644
--- a/src/id.rs
+++ b/src/id.rs
@@ -87,14 +87,14 @@ impl FolgezettelId {
         let mut next_kind = Kind::Number;
 
         while position < input.len() {
-            let next = input[position..].chars().next();
-
-            if let Some(separator) = next.filter(|c| !segments.is_empty() && SEPARATORS.contains(c))
+            if let Some(separator) = input[position..]
+                .chars()
+                .next()
+                .filter(|c| !segments.is_empty() && SEPARATORS.contains(c))
             {
                 position += separator.len_utf8();
                 segments.push(Segment::Separator(separator));
                 next_kind = next_kind.toggle();
-                continue;
             }
 
             let rest = &input[position..];
@@ -189,6 +189,23 @@ fn reject_malformed_ids() {
     );
 }
 
+#[test]
+fn reject_dangling_separators() {
+    for (input, expected) in [
+        ("1.", ParseIdError::ExpectedNumber { position: 2 }),
+        ("1...", ParseIdError::ExpectedNumber { position: 2 }),
+        ("1..2", ParseIdError::ExpectedNumber { position: 2 }),
+        ("1a.", ParseIdError::ExpectedLetter { position: 3 }),
+        (".1", ParseIdError::ExpectedNumber { position: 0 }),
+    ] {
+        assert_eq!(
+            FolgezettelId::parse(input).unwrap_err(),
+            expected,
+            "parsing {input:?}"
+        );
+    }
+}
+
 #[test]
 fn normalizes_uppercase_letters() {
     assert_eq!(