diff --git a/api/src/opentrons/protocol_engine/commands/thermocycler/run_profile.py b/api/src/opentrons/protocol_engine/commands/thermocycler/run_profile.py
index 43f89ecbf87..5f49e182079 100644
--- a/api/src/opentrons/protocol_engine/commands/thermocycler/run_profile.py
+++ b/api/src/opentrons/protocol_engine/commands/thermocycler/run_profile.py
@@ -19,7 +19,7 @@ class RunProfileStepParams(BaseModel):
     """Input parameters for an individual Thermocycler profile step."""
 
     celsius: float = Field(..., description="Target temperature in °C.")
-    holdSeconds: int = Field(
+    holdSeconds: float = Field(
         ..., description="Time to hold target temperature at in seconds."
     )
 
diff --git a/api/tests/opentrons/protocol_runner/test_json_command_translator.py b/api/tests/opentrons/protocol_runner/test_json_command_translator.py
index 36955de5f09..b48d5328a33 100644
--- a/api/tests/opentrons/protocol_runner/test_json_command_translator.py
+++ b/api/tests/opentrons/protocol_runner/test_json_command_translator.py
@@ -292,6 +292,39 @@
             )
         ),
     ),
+    (
+        protocol_schema_v6.Command(
+            commandType="thermocycler/runProfile",
+            params=protocol_schema_v6.Params(
+                moduleId="module-id-abc123",
+                blockMaxVolumeUl=1.11,
+                profile=[
+                    protocol_schema_v6.ProfileStep(
+                        celsius=2.22,
+                        holdSeconds=3.33,
+                    ),
+                    protocol_schema_v6.ProfileStep(
+                        celsius=4.44,
+                        holdSeconds=5.55,
+                    ),
+                ],
+            ),
+        ),
+        pe_commands.thermocycler.RunProfileCreate(
+            params=pe_commands.thermocycler.RunProfileParams(
+                moduleId="module-id-abc123",
+                blockMaxVolumeUl=1.11,
+                profile=[
+                    pe_commands.thermocycler.RunProfileStepParams(
+                        celsius=2.22, holdSeconds=3.33
+                    ),
+                    pe_commands.thermocycler.RunProfileStepParams(
+                        celsius=4.44, holdSeconds=5.55
+                    ),
+                ],
+            ),
+        ),
+    ),
 ]
 
 
diff --git a/shared-data/python/opentrons_shared_data/protocol/models/protocol_schema_v6.py b/shared-data/python/opentrons_shared_data/protocol/models/protocol_schema_v6.py
index 2268ba7d69e..7282f5e95f5 100644
--- a/shared-data/python/opentrons_shared_data/protocol/models/protocol_schema_v6.py
+++ b/shared-data/python/opentrons_shared_data/protocol/models/protocol_schema_v6.py
@@ -21,12 +21,17 @@ class Location(BaseModel):
     moduleId: Optional[str]
 
 
-# TODO (tamar 3/15/22): split apart all the command payloads when we tackle #9583
+class ProfileStep(BaseModel):
+    celsius: float
+    holdSeconds: float
+
+
 class WellLocation(BaseModel):
     origin: Optional[str]
     offset: Optional[OffsetVector]
 
 
+# TODO (tamar 3/15/22): split apart all the command payloads when we tackle #9583
 class Params(BaseModel):
     slotName: Optional[str]
     axes: Optional[List[str]]
@@ -57,6 +62,7 @@ class Params(BaseModel):
     rpm: Optional[float]
     height: Optional[float]
     offset: Optional[OffsetVector]
+    profile: Optional[List[ProfileStep]]
 
 
 class Command(BaseModel):