diff --git a/src/glypy/io/nomenclature/data/__init__.py b/src/glypy/io/nomenclature/data/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/glypy/io/nomenclature/synonyms.py b/src/glypy/io/nomenclature/synonyms.py
index 8100b9c..03f22ac 100644
--- a/src/glypy/io/nomenclature/synonyms.py
+++ b/src/glypy/io/nomenclature/synonyms.py
@@ -1,4 +1,5 @@
-import pkg_resources
+import importlib
+import importlib.resources
 import json
 
 
@@ -16,9 +17,9 @@ def __init__(self, data):
 
 
 class MonosaccharideSynonymIndex(SynonymIndex):
-    def __init__(self, stream=None):
-        if stream is None:
-            data_buffer = pkg_resources.resource_string(__name__, "data/monosaccharide_synonyms.json")
+    def __init__(self, data_buffer=None):
+        if data_buffer is None:
+            data_buffer = importlib.resources.read_text("glypy.io.nomenclature.data", "monosaccharide_synonyms.json")
             if isinstance(data_buffer, bytes):
                 data_buffer = data_buffer.decode("utf-8")
         super(MonosaccharideSynonymIndex, self).__init__(json.loads(data_buffer))
diff --git a/src/glypy/structure/named_structures.py b/src/glypy/structure/named_structures.py
index 1562be9..db512fe 100644
--- a/src/glypy/structure/named_structures.py
+++ b/src/glypy/structure/named_structures.py
@@ -1,7 +1,9 @@
-import pkg_resources
+import importlib.resources
 import hjson
 import re
 
+import importlib
+
 from glypy.utils import StringIO, identity, uid
 from glypy.utils.lazy import ProxyObject
 from glypy.io import glycoct
@@ -47,7 +49,7 @@ def __str__(self):  # pragma: no cover
 class MonosaccharideIndex(StructureIndex):
     def __init__(self, stream=None, key_transform=identity, value_transform=lambda x: x.root):
         if stream is None:
-            stream = pkg_resources.resource_stream(__name__, "data/monosaccharides.hjson")
+            stream = importlib.resources.open_text("glypy.structure.data", "monosaccharides.hjson")
         with stream:
             super(MonosaccharideIndex, self).__init__(stream, key_transform, value_transform)
 
@@ -65,7 +67,7 @@ def value_transform(x):
             return MonosaccharideResidue.from_monosaccharide(x.root)
 
         if stream is None:
-            stream = pkg_resources.resource_stream(__name__, "data/monosaccharides.hjson")
+            stream = importlib.resources.open_text("glypy.structure.data", "monosaccharides.hjson")
         super(MonosaccharideIndex, self).__init__(stream, key_transform, value_transform)
 
 
@@ -75,7 +77,7 @@ def value_transform(x):
 class GlycanIndex(StructureIndex):
     def __init__(self, stream=None, key_transform=identity, value_transform=identity):
         if stream is None:
-            stream = pkg_resources.resource_stream(__name__, "data/glycans.hjson")
+            stream = importlib.resources.open_text("glypy.structure.data", "glycans.hjson")
         super(GlycanIndex, self).__init__(stream, key_transform, value_transform)
 
 
@@ -85,7 +87,7 @@ def __init__(self, stream=None, key_transform=identity, value_transform=identity
 class MotifIndex(StructureIndex):
     def __init__(self, stream=None, key_transform=identity, value_transform=identity):
         if stream is None:
-            stream = pkg_resources.resource_stream(__name__, "data/motifs.hjson")
+            stream = importlib.resources.open_text("glypy.structure.data", "motifs.hjson")
         with stream:
             data = hjson.load(stream)
         motif_classes = set()