diff --git a/Dockerfile b/Dockerfile
deleted file mode 100644
index e8a79ca..0000000
--- a/Dockerfile
+++ /dev/null
@@ -1,68 +0,0 @@
-FROM alpine:3.19 AS builder
-
-RUN apk add --no-cache cargo
-
-RUN mkdir /src
-COPY . /src
-WORKDIR /src
-
-RUN cargo build --release --no-default-features
-
-# ##############################################
-
-FROM alpine:3.19
-
-ARG ffmpeg_ver=7.0
-
-RUN apk add --no-cache \
-		dav1d fontconfig freetype harfbuzz librsvg libva lilv-libs opus svt-av1 x264-libs x265 \
-		font-noto inkscape libarchive-tools libgcc \
-	# we install ffmpeg ourselves to get libsvtav1 support which is not part of the alpine package \
- && apk add --no-cache --virtual .build-deps \
-		build-base \
-		dav1d-dev fontconfig-dev freetype-dev harfbuzz-dev librsvg-dev libva-dev lilv-dev opus-dev svt-av1-dev x264-dev x265-dev \
- && wget -q https://ffmpeg.org/releases/ffmpeg-${ffmpeg_ver}.tar.bz2 \
- && tar xfa ffmpeg-${ffmpeg_ver}.tar.bz2 \
- && cd ffmpeg-${ffmpeg_ver} \
- && ./configure \
-		--prefix=/usr/local \
-		--disable-asm \
-		--disable-librtmp \
-		--disable-lzma \
-		--disable-static \
-		--enable-avfilter \
-		--enable-gpl \
-		--enable-libdav1d \
-		--enable-libfontconfig \
-		--enable-libfreetype \
-		--enable-libharfbuzz \
-		--enable-libopus \
-		--enable-librsvg \
-		--enable-libsvtav1 \
-		--enable-libx264 \
-		--enable-libx265 \
-		--enable-lto=auto \
-		--enable-lv2 \
-		--enable-pic \
-		--enable-postproc \
-		--enable-pthreads \
-		--enable-shared \
-		--enable-vaapi \
-		--enable-version3 \
-		--optflags="-O3" \
- && make -j$(nproc) install \
- && apk del --no-cache .build-deps \
- && cd .. \
- && rm -r ffmpeg-${ffmpeg_ver} ffmpeg-${ffmpeg_ver}.tar.bz2 \
- # we need Arial Black for the VideoAG logo \
- && wget -q https://www.freedesktop.org/software/fontconfig/webfonts/webfonts.tar.gz \
- && tar xfa webfonts.tar.gz \
- && cd msfonts \
- && for file in *.exe; do bsdtar xf "$file"; done \
- && install -Dm644 -t /usr/share/fonts/msfonts/ *.ttf *.TTF \
- && install -Dm644 -t /usr/share/licenses/msfonts/ Licen.TXT \
- && cd .. \
- && rm -r msfonts webfonts.tar.gz
-COPY --from=builder /src/target/release/render_video /usr/local/bin/render_video
-
-ENTRYPOINT ["/usr/local/bin/render_video"]
diff --git a/src/iotro.rs b/src/iotro.rs
index 4f98798..683eb10 100644
--- a/src/iotro.rs
+++ b/src/iotro.rs
@@ -94,12 +94,6 @@ pub const BRITISH: Language<'static> = Language {
 	questions_feedback: "Questions, Suggestions and Feedback"
 };
 
-impl Default for Language<'static> {
-	fn default() -> Self {
-		GERMAN
-	}
-}
-
 impl FromStr for Language<'static> {
 	type Err = anyhow::Error;
 
diff --git a/src/main.rs b/src/main.rs
index 048fa36..1e46727 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -154,7 +154,6 @@ struct ProjectLecture {
 	docent: String,
 	#[serde_as(as = "DisplayFromStr")]
 	date: Date,
-	#[serde(default = "Default::default")]
 	#[serde_as(as = "DisplayFromStr")]
 	lang: Language<'static>
 }