diff --git a/pyproject.toml b/pyproject.toml
index 24c3455..a764fe6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ dependencies = [
 ]
 
 [tool.uv.sources]
-genai_utils = { git = "https://github.com/FullFact/genai-utils.git", tag = "5.0.0"}
+genai_utils = { git = "https://github.com/FullFact/genai-utils.git", tag = "5.2.0"}
 
 [build-system]
 requires = ["setuptools >= 61.0",
diff --git a/src/pastel/pastel.py b/src/pastel/pastel.py
index 1c1d753..55dd1dc 100644
--- a/src/pastel/pastel.py
+++ b/src/pastel/pastel.py
@@ -10,7 +10,7 @@
 import numpy as np
 import numpy.typing as npt
 import tenacity
-from genai_utils.gemini import run_prompt
+from genai_utils.gemini import run_prompt_async
 from google.api_core import exceptions as core_exceptions
 
 from pastel import pastel_functions
@@ -207,7 +207,7 @@ async def _get_llm_answers_for_single_sentence(
         """Runs all genAI questions on the given sentence."""
         sent_answers: dict[FEATURE_TYPE, float] = {}
         prompt = self.make_prompt(sentence)
-        raw_output = run_prompt(prompt)
+        raw_output = await run_prompt_async(prompt)
         raw_output = raw_output.strip().lower()
         if "question" in raw_output:
             output = raw_output[raw_output.index("0") :]
diff --git a/tests/pastel/test_pastel.py b/tests/pastel/test_pastel.py
index 4c3f4d1..ad82189 100644
--- a/tests/pastel/test_pastel.py
+++ b/tests/pastel/test_pastel.py
@@ -78,7 +78,7 @@ def test_quantify_answers(pastel_instance: Pastel) -> None:
 
 
 @patch(
-    "pastel.pastel.run_prompt",
+    "pastel.pastel.run_prompt_async",
     side_effect=ValueError("Gemini failed"),
 )
 async def test_retries(mock_run_prompt: AsyncMock, pastel_instance: Pastel) -> None:
diff --git a/uv.lock b/uv.lock
index ff8b722..55b32c7 100644
--- a/uv.lock
+++ b/uv.lock
@@ -243,7 +243,7 @@ wheels = [
 [[package]]
 name = "genai-utils"
 version = "0.0.1"
-source = { git = "https://github.com/FullFact/genai-utils.git?tag=5.0.0#0a689e2a20bd32e09f1bb0d0543e2ba969392965" }
+source = { git = "https://github.com/FullFact/genai-utils.git?tag=5.2.0#da1638fde3e86c770f51d2aec7405f1f17cb303b" }
 dependencies = [
     { name = "google-cloud-core" },
     { name = "google-genai" },
@@ -700,7 +700,7 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "genai-utils", git = "https://github.com/FullFact/genai-utils.git?tag=5.0.0" },
+    { name = "genai-utils", git = "https://github.com/FullFact/genai-utils.git?tag=5.2.0" },
     { name = "google-cloud-core", specifier = ">=2.4.3" },
     { name = "pydantic", specifier = ">=2.11.7" },
     { name = "scikit-learn", specifier = ">=1.7.1" },