diff --git a/CHANGELOG.md b/CHANGELOG.md
index e150958f..be8e6f6a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
  - `unit()` can be used in mqtt fetch expressions. Example: `unit():stirring:target_rpm` is identical to `::stirring:target_rpm`. The latter can be seen as a shortened version of the former.
  - experiment profiles can have a `description` in the `job` field (i.e. at the same level as `actions`).
  - Updated Raspberry Pi OS image to 2024-07-04.
+ - Vendoring the TMP1075 library, which also fixes the RPi5 error.
 
 #### Breaking changes
 
diff --git a/pioreactor/background_jobs/monitor.py b/pioreactor/background_jobs/monitor.py
index 6181e78d..0e211948 100644
--- a/pioreactor/background_jobs/monitor.py
+++ b/pioreactor/background_jobs/monitor.py
@@ -380,7 +380,7 @@ def check_heater_pcb_temperature(self) -> None:
             from pioreactor.utils.mock import MockTMP1075 as TMP1075
         else:
             try:
-                from TMP1075 import TMP1075  # type: ignore
+                from pioreactor.utils.temps import TMP1075  # type: ignore
             except ImportError:
                 # leader-only is a worker?
                 self.logger.debug(
diff --git a/pioreactor/background_jobs/temperature_automation.py b/pioreactor/background_jobs/temperature_automation.py
index 0dbe987a..494fab92 100644
--- a/pioreactor/background_jobs/temperature_automation.py
+++ b/pioreactor/background_jobs/temperature_automation.py
@@ -117,7 +117,7 @@ def __init__(
         if whoami.is_testing_env():
             from pioreactor.utils.mock import MockTMP1075 as TMP1075
         else:
-            from TMP1075 import TMP1075  # type: ignore
+            from pioreactor.utils.temps import TMP1075  # type: ignore
 
         self.heater_duty_cycle = 0.0
         self.pwm = self.setup_pwm()
diff --git a/pioreactor/utils/adcs.py b/pioreactor/utils/adcs.py
index b64c4f4d..01bdad27 100644
--- a/pioreactor/utils/adcs.py
+++ b/pioreactor/utils/adcs.py
@@ -2,7 +2,7 @@
 # adc abstraction
 from __future__ import annotations
 
-import busio  # type: ignore
+from busio import I2C  # type: ignore
 
 from pioreactor import exc
 from pioreactor import hardware
@@ -51,7 +51,6 @@ def __init__(self) -> None:
         super().__init__()
 
         from adafruit_ads1x15.analog_in import AnalogIn  # type: ignore
-        from busio import I2C  # type: ignore
         from adafruit_ads1x15.ads1115 import ADS1115 as ADS  # type: ignore
 
         self.analog_in: dict[int, AnalogIn] = {}
@@ -94,7 +93,7 @@ def read_from_channel(self, channel: pt.AdcChannel) -> pt.AnalogValue:
 class Pico_ADC(_ADC):
     def __init__(self) -> None:
         # set up i2c connection to hardware.ADC
-        self.i2c = busio.I2C(hardware.SCL, hardware.SDA)
+        self.i2c = I2C(hardware.SCL, hardware.SDA)
 
     def read_from_channel(self, channel: pt.AdcChannel) -> pt.AnalogValue:
         assert 0 <= channel <= 3
diff --git a/pioreactor/utils/temps.py b/pioreactor/utils/temps.py
new file mode 100644
index 00000000..198916a8
--- /dev/null
+++ b/pioreactor/utils/temps.py
@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+from __future__ import annotations
+
+from adafruit_bus_device.i2c_device import I2CDevice
+from busio import I2C  # type: ignore
+
+from pioreactor import hardware
+
+
+class TMP1075:
+    """
+    Driver for the TI TMP1075 temperature sensor.
+    See datasheet: http://www.ti.com/lit/ds/symlink/tmp1075.pdf
+
+    """
+
+    TEMP_REGISTER = bytearray([0x00])
+    CONFIG_REGISTER = bytearray([0x01])
+
+    def __init__(self, address: int = 0x4F):
+        comm_port = (I2C(hardware.SCL, hardware.SDA),)
+        self.i2c = I2CDevice(comm_port, address)
+
+    def get_temperature(self) -> float:
+        b = bytearray(2)
+        self.i2c.write_then_readinto(self.TEMP_REGISTER, b)
+        return ((b[0] << 4) + (b[1] >> 4)) * 0.0625
+
+    @property
+    def temperature(self):
+        """alias for get_temperature"""
+        return self.get_temperature()
diff --git a/pioreactor/whoami.py b/pioreactor/whoami.py
index 93301d31..867f8746 100644
--- a/pioreactor/whoami.py
+++ b/pioreactor/whoami.py
@@ -148,10 +148,6 @@ def am_I_leader() -> bool:
     return get_unit_name() == leader_hostname
 
 
-def am_I_active_worker() -> bool:
-    return is_active(get_unit_name())
-
-
 def am_I_a_worker() -> bool:
     from pioreactor.pubsub import get_from_leader
 
diff --git a/requirements/requirements_worker.txt b/requirements/requirements_worker.txt
index 55a401be..ee351b63 100644
--- a/requirements/requirements_worker.txt
+++ b/requirements/requirements_worker.txt
@@ -13,6 +13,5 @@ pyftdi==0.55.4
 pyserial==3.5
 pyusb==1.2.1
 rpi_hardware_pwm==0.2.1
-TMP1075==0.2.1
 typing_extensions==4.12.2
 wheel==0.41.2
diff --git a/setup.py b/setup.py
index d5cb88cb..9099834f 100644
--- a/setup.py
+++ b/setup.py
@@ -53,7 +53,6 @@
     "pyserial==3.5",
     "pyusb==1.2.1",
     "rpi_hardware_pwm==0.2.1",
-    "TMP1075==0.2.1",
     "typing_extensions==4.12.2",
     "wheel==0.41.2",
 ]