diff --git a/api/tests/opentrons/hardware_control/test_instruments.py b/api/tests/opentrons/hardware_control/test_instruments.py
index 66480e71b82..6746b674353 100644
--- a/api/tests/opentrons/hardware_control/test_instruments.py
+++ b/api/tests/opentrons/hardware_control/test_instruments.py
@@ -115,7 +115,7 @@ async def test_aspirate(dummy_instruments, loop):
     aspirate_ul = 3.0
     aspirate_rate = 2
     await hw_api.aspirate(types.Mount.LEFT, aspirate_ul, aspirate_rate)
-    new_plunger_pos = 5.660769
+    new_plunger_pos = 6.05285
     assert hw_api.current_position(types.Mount.LEFT)[Axis.B] == new_plunger_pos
 
 
diff --git a/shared-data/robot-data/pipetteModelSpecs.json b/shared-data/robot-data/pipetteModelSpecs.json
index be2bc413c40..b7745065c55 100644
--- a/shared-data/robot-data/pipetteModelSpecs.json
+++ b/shared-data/robot-data/pipetteModelSpecs.json
@@ -14,11 +14,11 @@
     "dropTipCurrent": 0.5,
     "ulPerMm": {
       "aspirate": [
-        [1.8263, -0.0958, 1.088],
-        [ 2.5222, -0.104, 1.1031],
-        [ 3.2354, -0.0447, 0.9536],
-        [ 3.9984, -0.012, 0.8477],
-        [12.5135, -0.0021, 0.8079]
+        [1.438649211,	0.01931415115,	0.691538317],
+        [1.836824579,	0.03868955123,	0.6636639129],
+        [2.960052684,	0.00470371018,	0.7260899411],
+        [4.487508789,	0.005175245625,	0.7246941713],
+        [10.59661421,	0.001470408978,	0.7413196584]
       ],
       "dispense": [
         [12.5135, 0, 0.7945]
@@ -42,11 +42,11 @@
     "dropTipCurrent": 0.5,
     "ulPerMm": {
       "aspirate": [
-        [1.8263, -0.0958, 1.088],
-        [ 2.5222, -0.104, 1.1031],
-        [ 3.2354, -0.0447, 0.9536],
-        [ 3.9984, -0.012, 0.8477],
-        [12.5135, -0.0021, 0.8079]
+        [1.438649211,	0.01931415115,	0.691538317],
+        [1.836824579,	0.03868955123,	0.6636639129],
+        [2.960052684,	0.00470371018,	0.7260899411],
+        [4.487508789,	0.005175245625,	0.7246941713],
+        [10.59661421,	0.001470408978,	0.7413196584]
       ],
       "dispense": [
         [12.5135, 0, 0.7945]
@@ -70,11 +70,11 @@
     "dropTipCurrent": 0.5,
     "ulPerMm": {
       "aspirate": [
-        [1.8263, -0.0958, 1.088],
-        [ 2.5222, -0.104, 1.1031],
-        [ 3.2354, -0.0447, 0.9536],
-        [ 3.9984, -0.012, 0.8477],
-        [12.5135, -0.0021, 0.8079]
+        [1.438649211,	0.01931415115,	0.691538317],
+        [1.836824579,	0.03868955123,	0.6636639129],
+        [2.960052684,	0.00470371018,	0.7260899411],
+        [4.487508789,	0.005175245625,	0.7246941713],
+        [10.59661421,	0.001470408978,	0.7413196584]
       ],
       "dispense": [
         [12.5135, 0, 0.7945]