diff --git a/script/hassfest/docker.py b/script/hassfest/docker.py
index 022caee30cd..edc47e2f9d7 100644
--- a/script/hassfest/docker.py
+++ b/script/hassfest/docker.py
@@ -94,6 +94,8 @@ COPY . /usr/src/homeassistant
 
 # Uv is only needed during build
 RUN --mount=from=ghcr.io/astral-sh/uv:{uv},source=/uv,target=/bin/uv \
+    # Uv creates a lock file in /tmp
+    --mount=type=tmpfs,target=/tmp \
     # Required for PyTurboJPEG
     apk add --no-cache libturbojpeg \
     && uv pip install \
diff --git a/script/hassfest/docker/Dockerfile b/script/hassfest/docker/Dockerfile
index 3da4eb386de..4e711a29b28 100644
--- a/script/hassfest/docker/Dockerfile
+++ b/script/hassfest/docker/Dockerfile
@@ -15,6 +15,8 @@ COPY . /usr/src/homeassistant
 
 # Uv is only needed during build
 RUN --mount=from=ghcr.io/astral-sh/uv:0.5.8,source=/uv,target=/bin/uv \
+    # Uv creates a lock file in /tmp
+    --mount=type=tmpfs,target=/tmp \
     # Required for PyTurboJPEG
     apk add --no-cache libturbojpeg \
     && uv pip install \