diff --git a/Doxygen b/Doxygen
index c61d7beba..2c9389253 100644
--- a/Doxygen
+++ b/Doxygen
@@ -38,7 +38,7 @@ PROJECT_NAME           = "ESPHome"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 2021.9.0b2
+PROJECT_NUMBER         = 2021.9.0b3
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/Makefile b/Makefile
index 1e0068423..1b8965fc2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 ESPHOME_PATH = ../esphome
-ESPHOME_REF = 2021.9.0b2
+ESPHOME_REF = 2021.9.0b3
 
 .PHONY: html html-strict cleanhtml deploy help webserver Makefile netlify netlify-api api netlify-dependencies svg2png copy-svg2png
 
diff --git a/_static/version b/_static/version
index ee4eddae9..10cc8a5e9 100644
--- a/_static/version
+++ b/_static/version
@@ -1 +1 @@
-2021.9.0b2
\ No newline at end of file
+2021.9.0b3
\ No newline at end of file
diff --git a/changelog/2021.9.0.rst b/changelog/2021.9.0.rst
index a78856c80..bee9b850f 100644
--- a/changelog/2021.9.0.rst
+++ b/changelog/2021.9.0.rst
@@ -76,6 +76,8 @@ Beta Fixes
 
 - Fix a few ESP32-C3 compiler issues :esphomepr:`2265` by :ghuser:`jesserockz`
 - sm300d2: Accept (undocumented) 0x80 checksum offset. :esphomepr:`2263` by :ghuser:`poptix`
+- Disable automatic usage of SNTP servers from DHCP :esphomepr:`2273` by :ghuser:`oxan`
+- Fix API socket issues :esphomepr:`2288` by :ghuser:`OttoWinter`
 
 All changes
 ^^^^^^^^^^^
@@ -145,6 +147,8 @@ All changes
 - PMSA003i Update state_class and async :esphomepr:`2216` by :ghuser:`sjtrny`
 - Fix a few ESP32-C3 compiler issues :esphomepr:`2265` by :ghuser:`jesserockz`
 - sm300d2: Accept (undocumented) 0x80 checksum offset. :esphomepr:`2263` by :ghuser:`poptix`
+- Disable automatic usage of SNTP servers from DHCP :esphomepr:`2273` by :ghuser:`oxan`
+- Fix API socket issues :esphomepr:`2288` by :ghuser:`OttoWinter`
 
 Past Changelogs
 ---------------
diff --git a/conf.py b/conf.py
index 072cec058..7e7bc9347 100644
--- a/conf.py
+++ b/conf.py
@@ -69,7 +69,7 @@ author = "Otto Winter"
 # The short X.Y version.
 version = "2021.9"
 # The full version, including alpha/beta/rc tags.
-release = "2021.9.0b2"
+release = "2021.9.0b3"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/guides/supporters.rst b/guides/supporters.rst
index 24bf6ec39..def9ed376 100644
--- a/guides/supporters.rst
+++ b/guides/supporters.rst
@@ -19,6 +19,7 @@ Contributors
 - `0hax (@0hax) <https://github.com/0hax>`__
 - `Nikola (@0nikola1) <https://github.com/0nikola1>`__
 - `0x0a11c0de (@0x0a11c0de) <https://github.com/0x0a11c0de>`__
+- `Tercio Filho (@0x3333) <https://github.com/0x3333>`__
 - `2016for (@2016for) <https://github.com/2016for>`__
 - `Pavel Golovin (@31337Ghost) <https://github.com/31337Ghost>`__
 - `David Martin (@3ative) <https://github.com/3ative>`__
@@ -285,15 +286,18 @@ Contributors
 - `Michael (@imeekle) <https://github.com/imeekle>`__
 - `imgbot[bot] (@imgbot[bot]) <https://github.com/imgbot[bot]>`__
 - `Lorenzo Ortiz (@Infinitte) <https://github.com/Infinitte>`__
+- `irtimaled (@irtimaled) <https://github.com/irtimaled>`__
 - `Ivan Shvedunov (@ivan4th) <https://github.com/ivan4th>`__
 - `Ivan Kravets (@ivankravets) <https://github.com/ivankravets>`__
 - `Ivo-tje (@Ivo-tje) <https://github.com/Ivo-tje>`__
 - `Jakob Reiter (@jakommo) <https://github.com/jakommo>`__
+- `James Braid (@jamesbraid) <https://github.com/jamesbraid>`__
 - `James Gao (@jamesgao) <https://github.com/jamesgao>`__
 - `János Rusiczki (@janosrusiczki) <https://github.com/janosrusiczki>`__
 - `Jan Pieper (@janpieper) <https://github.com/janpieper>`__
 - `Jason-nz (@Jason-nz) <https://github.com/Jason-nz>`__
 - `Jason Hines (@jasonehines) <https://github.com/jasonehines>`__
+- `Jas Strong (@jasstrong) <https://github.com/jasstrong>`__
 - `JbLb (@jblb) <https://github.com/jblb>`__
 - `James Callaghan (@jcallaghan) <https://github.com/jcallaghan>`__
 - `Josh Willox (@jcwillox) <https://github.com/jcwillox>`__
@@ -698,4 +702,4 @@ Contributors
 - `ZTX18 (@ZTX18) <https://github.com/ZTX18>`__
 - `Christian Zufferey (@zuzu59) <https://github.com/zuzu59>`__
 
-*This page was last updated September 10, 2021.*
+*This page was last updated September 14, 2021.*