diff --git a/ANNOUNCE b/ANNOUNCE
index 5e9592d..5181cd0 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,4 +1,4 @@
-I am happy to announce Guppy 3 3.0.10
+I am happy to announce Guppy 3 3.1.0
 
 Guppy 3 is a library and programming environment for Python,
 currently providing in particular the Heapy subsystem, which supports
@@ -10,10 +10,14 @@ common source.
 
 Guppy 3 is a fork of Guppy-PE, created by Sverker Nilsson for Python 2.
 
-The main news in this release:
+This is a major feature release. The main news in this release:
 
-o Skip modules that don't have __dict__ attributes [Bob Haddleton]
-o Replace a few instances of ZeroDivisionError with inspect.currentframe()
+o Python 3.9 support, without subinterpreter support or inter-interpreter
+  traversal.
+o Added .byprod classifier via tracemalloc, and .prod to print thracemalloc
+  traceback.
+o Added .all to print all lines in a MorePrinter buffer.
+o Added R_INSET relation for being contained by an unordered set.
 
 License: MIT
 
diff --git a/ChangeLog b/ChangeLog
index 70083ab..195e6d1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,10 +1,38 @@
+    Version 3.1.0
+
+2020-10-10  YiFei Zhu  <zhuyifei1999@gmail.com>
+
+    * Nothing changed, just releasing 3.1.0
+
+2020-10-09  YiFei Zhu  <zhuyifei1999@gmail.com>
+
+    * Python 3.9 support, no inter-interpreter support
+
+2020-06-14  YiFei Zhu  <zhuyifei1999@gmail.com>
+
+    * Add R_INSET relation for in unordered set relationship
+
+2020-06-13  YiFei Zhu  <zhuyifei1999@gmail.com>
+
+    * Unified MorePrinter code path
+    * Set __qualname__ to __name__ on dynamic classes
+
+2020-05-19  YiFei Zhu  <zhuyifei1999@gmail.com>
+
+    * hp.Prod(), .byprod classifier, producer profiler
+    * IdentitySet.prod to print tracemalloc results
+
+2020-05-14  YiFei Zhu  <zhuyifei1999@gmail.com>
+
+    * Add .all to MorePrinter
+
     Version 3.0.10
 
-2019-05-12  YiFei Zhu  <zhuyifei1999@gmail.com>
+2020-05-12  YiFei Zhu  <zhuyifei1999@gmail.com>
 
     * Nothing changed, just releasing 3.0.10
 
-2019-03-01  YiFei Zhu  <zhuyifei1999@gmail.com>
+2020-03-01  YiFei Zhu  <zhuyifei1999@gmail.com>
 
     * Skip modules that don't have __dict__ attributes [Bob Haddleton]
 
diff --git a/README.md b/README.md
index 45d5bc3..442d36d 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Guppy 3 is a fork of Guppy-PE, created by Sverker Nilsson for Python 2.
 
 ## Requirements
 
-You should have Python 3.5, 3.6, 3.7, or 3.8. This package is CPython only;
+You should have Python 3.5, 3.6, 3.7, 3.8, or 3.9. This package is CPython only;
 PyPy and other Python implementations are not supported. Python 2 support
 can be obtained from [guppy-pe](http://guppy-pe.sourceforge.net/) by
 Sverker Nilsson, from which this package is forked.
diff --git a/setup.py b/setup.py
index 33bfaee..225f04c 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,7 @@ def doit():
         long_description = f.read()
 
     setup(name="guppy3",
-          version="3.0.10.post1",
+          version="3.1.0",
           description="Guppy 3 -- Guppy-PE ported to Python 3",
           long_description=long_description,
           long_description_content_type='text/markdown',
diff --git a/travis.sh b/travis.sh
index 06aea63..3e27366 100755
--- a/travis.sh
+++ b/travis.sh
@@ -101,10 +101,10 @@ cibuildwheel-source)
 cibuildwheel)
     case "$1" in
     install)
-        pip install cibuildwheel==1.4.1
+        pip install cibuildwheel==1.6.2
         ;;
     script)
-        CIBW_BUILD='cp3[5678]-*' cibuildwheel --output-dir wheelhouse
+        CIBW_BUILD='cp3[56789]-*' cibuildwheel --output-dir wheelhouse
         ;;
     after_success)
         pip install twine