diff --git a/CHANGELOG.md b/CHANGELOG.md
index d232b1c..85da748 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.2.6] - 2026-06-12
+
+### Fixed
+
+- **Dockerfile: `ARG TARGETARCH` re-declared in each stage**: Docker's automatic platform ARGs are only in scope for `FROM` instructions, not `RUN` commands. The `$TARGETARCH` variable in the deadsnakes PPA conditional was silently empty, so the PPA was never added and `python3.13` could not be located on the Ubuntu 22.04 CUDA base. Adding `ARG TARGETARCH` at the top of both the `build` and `runtime` stage bodies fixes the amd64 build.
+
 ## [0.2.5] - 2026-06-12
 
 ### Changed
diff --git a/Dockerfile b/Dockerfile
index fad6885..a894fc5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,6 +10,7 @@ ARG TARGETARCH
 
 FROM base-${TARGETARCH} AS build
 
+ARG TARGETARCH
 ENV DEBIAN_FRONTEND=noninteractive
 
 # amd64 (Ubuntu 22.04 CUDA base): Python 3.13 via deadsnakes PPA
@@ -47,6 +48,7 @@ RUN chmod +x /app/entrypoint.sh
 
 FROM base-${TARGETARCH} AS runtime
 
+ARG TARGETARCH
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
diff --git a/pyproject.toml b/pyproject.toml
index 746532e..bd96b79 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "winnow"
-version = "0.2.5"
+version = "0.2.6"
 description = "Immich to Frigate training sets"
 license = "MIT"
 requires-python = ">=3.13"