diff --git a/Cargo.toml b/Cargo.toml
index a26b221..0264f1e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hdt"
-version = "0.2.1"
+version = "0.2.2"
 repository = "https://github.com/konradhoeffner/hdt"
 authors = ["Tim Baccaert <tbaccaer@vub.be>", "Konrad Höffner"]
 license = "MIT"
@@ -18,11 +18,11 @@ crc = "3"
 iref = "3"
 langtag = "0.4"
 ntriple = "0.1"
-sophia = { version = "0.8.0", optional = true }
+sophia = { version = "0.9", optional = true }
 sucds = "0.8"
 thiserror = "2"
 log = "0.4"
-mownstr = "0.2"
+mownstr = "0.3"
 lazy_static = "1"
 eyre = "0.6"
 
diff --git a/src/hdt_graph.rs b/src/hdt_graph.rs
index 3bb5b1e..064ecb1 100644
--- a/src/hdt_graph.rs
+++ b/src/hdt_graph.rs
@@ -4,7 +4,7 @@ use crate::four_sect_dict::IdKind;
 use crate::hdt::Hdt;
 use crate::triples::{Id, ObjectIter, PredicateIter, PredicateObjectIter, SubjectIter, TripleId};
 use log::debug;
-use sophia::api::graph::{GTripleSource, Graph};
+use sophia::api::graph::Graph;
 use sophia::api::term::{matcher::TermMatcher, BnodeId, IriRef, LanguageTag, Term};
 use std::convert::Infallible;
 use std::io::{self, Error, ErrorKind};
@@ -134,11 +134,11 @@ impl Graph for HdtGraph {
     ///     println!("{:?}", graph.triples().next().expect("no triple in the graph"));
     /// }
     /// ```
-    fn triples(&self) -> GTripleSource<Self> {
+    fn triples(&self) -> impl Iterator<Item=Result<Self::Triple<'_>, Self::Error>> {
         debug!("Iterating through ALL triples in the HDT Graph. This can be inefficient for large graphs.");
-        Box::new(self.hdt.triples().map(move |(s, p, o)| {
+        self.hdt.triples().map(move |(s, p, o)| {
             Ok([auto_term(&s).unwrap(), HdtTerm::Iri(IriRef::new_unchecked(p)), auto_term(&o).unwrap()])
-        }))
+        })
     }
 
     /// Only supports constant and "any" matchers.
@@ -156,7 +156,8 @@ impl Graph for HdtGraph {
     ///     let persons = dbpedia.triples_matching(Any, Some(birth_place), Some(leipzig));
     /// }
     /// ```
-    fn triples_matching<'s, S, P, O>(&'s self, sm: S, pm: P, om: O) -> GTripleSource<'s, Self>
+    #[allow(refining_impl_trait)]
+    fn triples_matching<'s, S, P, O>(&'s self, sm: S, pm: P, om: O) -> Box<dyn Iterator<Item=Result<Self::Triple<'s>, Self::Error>>  + 's>
     where
         S: TermMatcher + 's,
         P: TermMatcher + 's,
diff --git a/src/hdt_graph/term.rs b/src/hdt_graph/term.rs
index 37bdedd..e611e15 100644
--- a/src/hdt_graph/term.rs
+++ b/src/hdt_graph/term.rs
@@ -65,14 +65,14 @@ impl Term for HdtTerm {
 
     fn iri(&self) -> Option<sophia::api::term::IriRef<mownstr::MownStr>> {
         match self {
-            HdtTerm::Iri(iri) => Some(iri.as_ref().map_unchecked(MownStr::from_str)),
+            HdtTerm::Iri(iri) => Some(iri.as_ref().map_unchecked(MownStr::from_ref)),
             _ => None,
         }
     }
 
     fn bnode_id(&self) -> Option<BnodeId<mownstr::MownStr>> {
         match self {
-            HdtTerm::BlankNode(bnid) => Some(bnid.as_ref().map_unchecked(MownStr::from_str)),
+            HdtTerm::BlankNode(bnid) => Some(bnid.as_ref().map_unchecked(MownStr::from_ref)),
             _ => None,
         }
     }
@@ -86,7 +86,7 @@ impl Term for HdtTerm {
 
     fn datatype(&self) -> Option<sophia::api::term::IriRef<mownstr::MownStr>> {
         match self {
-            HdtTerm::LiteralDatatype(_, datatype) => Some(datatype.as_ref().map_unchecked(MownStr::from_str)),
+            HdtTerm::LiteralDatatype(_, datatype) => Some(datatype.as_ref().map_unchecked(MownStr::from_ref)),
             HdtTerm::LiteralLanguage(..) => rdf::langString.iri(),
             _ => None,
         }
@@ -94,7 +94,7 @@ impl Term for HdtTerm {
 
     fn language_tag(&self) -> Option<LanguageTag<mownstr::MownStr>> {
         match self {
-            HdtTerm::LiteralLanguage(_, tag) => Some(tag.as_ref().map_unchecked(MownStr::from_str)),
+            HdtTerm::LiteralLanguage(_, tag) => Some(tag.as_ref().map_unchecked(MownStr::from_ref)),
             _ => None,
         }
     }