diff --git a/rust/case2geojson/Cargo.lock b/rust/case2geojson/Cargo.lock
index ef8d7c2..69e2e06 100644
--- a/rust/case2geojson/Cargo.lock
+++ b/rust/case2geojson/Cargo.lock
@@ -142,7 +142,7 @@ name = "case2geojson"
 version = "0.1.0"
 dependencies = [
  "geojson",
- "iref",
+ "iref 4.0.0",
  "json-ld",
  "oxigraph",
  "serde_json",
@@ -623,13 +623,26 @@ dependencies = [
  "iref-core",
 ]
 
+[[package]]
+name = "iref"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c686ecc4b688a6beb639434f8c10900ebb00ae73b9e981db430eb8416cc17ca"
+dependencies = [
+ "pct-str 3.0.1",
+ "smallvec",
+ "static-automata",
+ "str-newtype",
+ "thiserror 2.0.12",
+]
+
 [[package]]
 name = "iref-core"
 version = "3.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b10559a0d518effd4f2cee107f40f83acf8583dcd3e6760b9b60293b0d2c2a70"
 dependencies = [
- "pct-str",
+ "pct-str 2.0.0",
  "smallvec",
  "static-regular-grammar",
  "thiserror 1.0.69",
@@ -665,7 +678,7 @@ checksum = "c3f0afe72eef988fd8fc4341b8c8b25c00820085eb32d3e6d8db1d619e34ecbe"
 dependencies = [
  "contextual",
  "futures",
- "iref",
+ "iref 3.2.2",
  "json-ld-compaction",
  "json-ld-context-processing",
  "json-ld-core",
@@ -688,7 +701,7 @@ dependencies = [
  "educe 0.4.23",
  "futures",
  "indexmap 2.9.0",
- "iref",
+ "iref 3.2.2",
  "json-ld-context-processing",
  "json-ld-core",
  "json-ld-expansion",
@@ -708,7 +721,7 @@ checksum = "794733ae1552eb7252972da511dfe1c65ec793e21fd025f732534e994d0abe93"
 dependencies = [
  "contextual",
  "futures",
- "iref",
+ "iref 3.2.2",
  "json-ld-core",
  "json-ld-syntax",
  "mown",
@@ -727,7 +740,7 @@ dependencies = [
  "futures",
  "hashbrown 0.13.2",
  "indexmap 2.9.0",
- "iref",
+ "iref 3.2.2",
  "json-ld-syntax",
  "json-syntax",
  "langtag",
@@ -754,7 +767,7 @@ dependencies = [
  "educe 0.4.23",
  "futures",
  "indexmap 2.9.0",
- "iref",
+ "iref 3.2.2",
  "json-ld-context-processing",
  "json-ld-core",
  "json-ld-syntax",
@@ -772,7 +785,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5ebec38a2fe2ce7dac0a7d341734a526d52c7902e9e37e6904a5eae647f09234"
 dependencies = [
  "indexmap 2.9.0",
- "iref",
+ "iref 3.2.2",
  "json-ld-core",
  "json-syntax",
  "linked-data",
@@ -792,7 +805,7 @@ dependencies = [
  "educe 0.4.23",
  "hashbrown 0.13.2",
  "indexmap 2.9.0",
- "iref",
+ "iref 3.2.2",
  "json-syntax",
  "langtag",
  "locspan",
@@ -828,7 +841,7 @@ dependencies = [
  "ryu-js 0.2.2",
  "smallstr",
  "smallvec",
- "utf8-decode",
+ "utf8-decode 1.0.1",
 ]
 
 [[package]]
@@ -940,7 +953,7 @@ checksum = "04fd672ff31f4a6007acbdd33e1b65e1144081ec09b4189b3d20da3997603e90"
 dependencies = [
  "educe 0.4.23",
  "im",
- "iref",
+ "iref 3.2.2",
  "json-syntax",
  "linked-data-derive",
  "rdf-types",
@@ -956,7 +969,7 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "887a1903665b47c2dcff59682d8de1be46813819ae0337d8eaa885035762fbee"
 dependencies = [
- "iref",
+ "iref 3.2.2",
  "proc-macro-error",
  "proc-macro2",
  "quote",
@@ -1231,7 +1244,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bf1bdcc492c285a50bed60860dfa00b50baf1f60c73c7d6b435b01a2a11fd6ff"
 dependencies = [
  "thiserror 1.0.69",
- "utf8-decode",
+ "utf8-decode 1.0.1",
+]
+
+[[package]]
+name = "pct-str"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "756dc82399e1ef9b37bd698266e4b7fed5f3d3cccb09fbc6b602086c9077e4ad"
+dependencies = [
+ "utf8-decode 2.0.0",
 ]
 
 [[package]]
@@ -1419,7 +1441,7 @@ dependencies = [
  "contextual",
  "educe 0.5.11",
  "indexmap 2.9.0",
- "iref",
+ "iref 3.2.2",
  "langtag",
  "raw-btree",
  "replace_with",
@@ -1680,13 +1702,35 @@ dependencies = [
  "spargebra",
 ]
 
+[[package]]
+name = "static-automata"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24aafe52c9851a4ac4a9746224300d2e0c2a26d2da510ce36bd4fbe5aed56579"
+dependencies = [
+ "static-automata-macros",
+]
+
+[[package]]
+name = "static-automata-macros"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e36fcb2913af3b8d092099595dbb13c750474f486acc83c9cf058971ceae3c74"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.100",
+ "thiserror 2.0.12",
+]
+
 [[package]]
 name = "static-iref"
 version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3cc4068497ae43896d41174586dcdc2153a1af2c82856fb308bfaaddc28e5549"
 dependencies = [
- "iref",
+ "iref 3.2.2",
  "quote",
  "syn 2.0.100",
 ]
@@ -1717,6 +1761,28 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
+[[package]]
+name = "str-newtype"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ae04885ca2475d7ab569df6dfd14238c2ec736464866ec45da54009a8cd7ec8"
+dependencies = [
+ "str-newtype-derive",
+]
+
+[[package]]
+name = "str-newtype-derive"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee0d70ab7f0bc2dcd347d558a4305d979d407d1941e536e986e05d55c661e751"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.100",
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.109"
@@ -1834,6 +1900,12 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca61eb27fa339aa08826a29f03e87b99b4d8f0fc2255306fd266bb1b6a9de498"
 
+[[package]]
+name = "utf8-decode"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7932c10aa1600e9ddee027024aa9c0d397a103478253bf3fd6cea6dd03161b8a"
+
 [[package]]
 name = "version_check"
 version = "0.9.5"
@@ -2049,7 +2121,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c5bf1ac247150da9bff673820d7dcc22bca6ab621b4ee4f76650b581aff47580"
 dependencies = [
  "chrono",
- "iref",
+ "iref 3.2.2",
  "lazy_static",
  "num-bigint",
  "num-rational",
diff --git a/rust/case2geojson/Cargo.toml b/rust/case2geojson/Cargo.toml
index a18095d..c8f579c 100644
--- a/rust/case2geojson/Cargo.toml
+++ b/rust/case2geojson/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 
 [dependencies]
 geojson = "1.0.0"
-iref = "3.2.2"
+iref = "4.0.0"
 json-ld = { version = "0.21.4" }
 oxigraph = { version = "0.5.6", default-features = false}
 serde_json = "1.0.149"