diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3a38301b..7d750956 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11']
+        python: ['3.10', '3.11']
 
     env:
       RELEASE_FILE: ${{ github.event.repository.name }}-${{ github.event.release.tag_name || github.sha }}-py${{ matrix.python }}
diff --git a/.github/workflows/install.yml b/.github/workflows/install.yml
index f3c1a2d6..dcf4bb64 100644
--- a/.github/workflows/install.yml
+++ b/.github/workflows/install.yml
@@ -14,7 +14,7 @@ jobs:
       TERM: xterm-256color
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11']
+        python: ['3.10', '3.11']
 
     steps:
       - name: Checkout Code
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a54dac3e..4f1e2e64 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
       TERM: xterm-256color
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11']
+        python: ['3.10', '3.11']
 
     steps:
       - name: Checkout Code
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9e2033d..0f00c69c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+2.4.0
+-----
+
+* New: Support for the new AC Waveform Spectra 6 displays.
+
 2.3.0
 -----
 
diff --git a/inky/__init__.py b/inky/__init__.py
index 71cf83c3..a55fb6e7 100755
--- a/inky/__init__.py
+++ b/inky/__init__.py
@@ -12,7 +12,7 @@
 from .phat import InkyPHAT, InkyPHAT_SSD1608  # noqa: F401
 from .what import InkyWHAT  # noqa: F401
 
-__version__ = "2.3.0"
+__version__ = "2.4.0"
 
 try:
     from pkg_resources import declare_namespace
diff --git a/inky/auto.py b/inky/auto.py
index 67531abd..96006af6 100644
--- a/inky/auto.py
+++ b/inky/auto.py
@@ -39,9 +39,9 @@ def auto(i2c_bus=None, ask_user=False, verbose=False):
             return InkyWHAT_SSD1683((400, 300), _eeprom.get_color())
         if _eeprom.display_variant == 20:
             return InkyAC073TC1A(resolution=(800, 480))
-        if _eeprom.display_variant == 21:
+        if _eeprom.display_variant in (21, 27):
             return InkyEL133UF1(resolution=(1600, 1200))
-        if _eeprom.display_variant == 22:
+        if _eeprom.display_variant in (22, 26):
             return InkyE673(resolution=(800, 480))
         if _eeprom.display_variant == 23:
             return InkyJD79661(resolution=(250, 122))
diff --git a/inky/eeprom.py b/inky/eeprom.py
index 8368a73a..5a916ad0 100644
--- a/inky/eeprom.py
+++ b/inky/eeprom.py
@@ -35,7 +35,9 @@
     "Spectra 6 7.3 800 x 480 (E673)",
     "Red/Yellow pHAT (JD79661)",
     "Red/Yellow wHAT (JD79668)",
-    "Spectra 6 4.0 600 x 400 (E640)"
+    "Spectra 6 4.0 600 x 400 (E640)",
+    "Spectra 6 7.3 800 x 480 (E673) AC",
+    "Spectra 6 13.3 1600 x 1200 (EL133UF1) AC"
 ]
 
 
diff --git a/inky/inky_e673.py b/inky/inky_e673.py
index 4d9c580f..d55892be 100644
--- a/inky/inky_e673.py
+++ b/inky/inky_e673.py
@@ -261,6 +261,9 @@ def _update(self, buf):
         self._send_command(EL673_POF, [0x00])
         self._busy_wait(0.3)
 
+        self._send_command(EL673_PSR, [0x4F, 0x6E])
+        self._busy_wait(0.3)
+
     def set_pixel(self, x, y, v):
         """Set a single pixel.
 
diff --git a/inky/inky_el133uf1.py b/inky/inky_el133uf1.py
index fbe2353d..7368b5d1 100644
--- a/inky/inky_el133uf1.py
+++ b/inky/inky_el133uf1.py
@@ -51,6 +51,7 @@
 EL133UF1_PSR = 0x00
 EL133UF1_PWR = 0x01
 EL133UF1_POF = 0x02
+EL133UF1_POFS = 0x03
 EL133UF1_PON = 0x04
 EL133UF1_BTST_N = 0x05
 EL133UF1_BTST_P = 0x06
@@ -74,6 +75,9 @@
 EL133UF1_PTLW = 0x83
 EL133UF1_ANTM = 0x74
 EL133UF1_AGID = 0x86
+EL133UF1_CMDA4 = 0xA4
+EL133UF1_DCDC = 0xA5
+EL133UF1_CCSET = 0xE0
 EL133UF1_PWS = 0xE3
 EL133UF1_TSSET = 0xE5
 EL133UF1_CMD66 = 0xF0
@@ -233,23 +237,29 @@ def setup(self):
 
         self._busy_wait(0.3)
 
-        self._send_command(EL133UF1_ANTM, CS0_SEL, [0xC0, 0x1C, 0x1C, 0xCC, 0xCC, 0xCC, 0x15, 0x15, 0x55])
+        self._send_command(EL133UF1_ANTM, CS0_SEL, [0x00, 0x0C, 0x0C, 0xD9, 0xDD, 0xDD, 0x15, 0x15, 0x55])
 
         self._send_command(EL133UF1_CMD66, CS_BOTH_SEL, [0x49, 0x55, 0x13, 0x5D, 0x05, 0x10])
-        self._send_command(EL133UF1_PSR, CS_BOTH_SEL, [0xDF, 0x69])
+        self._send_command(EL133UF1_PSR, CS_BOTH_SEL, [0xDF, 0x6B])
+        self._send_command(EL133UF1_DCDC, CS0_SEL, [0x44, 0x54, 0x00])
         self._send_command(EL133UF1_PLL, CS_BOTH_SEL, [0x08])
-        self._send_command(EL133UF1_CDI, CS_BOTH_SEL, [0xF7])
+        self._send_command(EL133UF1_CDI, CS_BOTH_SEL, [0x37])
         self._send_command(EL133UF1_TCON, CS_BOTH_SEL, [0x03, 0x03])
+
+        self._send_command(EL133UF1_POFS, CS0_SEL, [0x00, 0xC0, 0x03, 0xA8])
+        self._send_command(EL133UF1_POFS, CS1_SEL, [0x00, 0xC0, 0x03, 0x9A])
+
         self._send_command(EL133UF1_AGID, CS_BOTH_SEL, [0x10])
         self._send_command(EL133UF1_PWS, CS_BOTH_SEL, [0x22])
         self._send_command(EL133UF1_CCSET, CS_BOTH_SEL, [0x01])
         self._send_command(EL133UF1_TRES, CS_BOTH_SEL, [0x04, 0xB0, 0x03, 0x20])
 
+        self._send_command(EL133UF1_CMDA4, CS0_SEL, [0x03, 0x00, 0x01, 0x03, 0x00, 0x03, 0x00, 0x00, 0x00])
         self._send_command(EL133UF1_PWR, CS0_SEL, [0x0F, 0x00, 0x28, 0x2C, 0x28, 0x38])
         self._send_command(EL133UF1_EN_BUF, CS0_SEL, [0x07])
-        self._send_command(EL133UF1_BTST_P, CS0_SEL, [0xD8, 0x18])
+        self._send_command(EL133UF1_BTST_P, CS0_SEL, [0xE0, 0x20])
         self._send_command(EL133UF1_BOOST_VDDP_EN, CS0_SEL, [0x01])
-        self._send_command(EL133UF1_BTST_N, CS0_SEL, [0xD8, 0x18])
+        self._send_command(EL133UF1_BTST_N, CS0_SEL, [0xE0, 0x20])
         self._send_command(EL133UF1_BUCK_BOOST_VDDN, CS0_SEL, [0x01])
         self._send_command(EL133UF1_TFT_VCOM_POWER, CS0_SEL, [0x02])