diff --git a/newsfragments/141.internal.rst b/newsfragments/141.internal.rst
new file mode 100644
index 0000000..14506f3
--- /dev/null
+++ b/newsfragments/141.internal.rst
@@ -0,0 +1 @@
+Add upper pin to ``hexbytes`` dependency to due incoming breaking change
diff --git a/setup.py b/setup.py
index d3b05b3..3457d1d 100644
--- a/setup.py
+++ b/setup.py
@@ -57,7 +57,7 @@
     install_requires=[
         "eth-hash>=0.1.0",
         "eth-utils>=2.0.0",
-        "hexbytes>=0.2.0",
+        "hexbytes>=0.2.0,<=0.3.1",
         "rlp>=3",
         "sortedcontainers>=2.1.0",
         "typing-extensions>=4.0.0,<5; python_version < '3.8'",