diff --git a/Dockerfile b/Dockerfile
index 8cc2aac..8f91c80 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -90,8 +90,14 @@ RUN ldconfig && \
     ffmpeg -version && \
     ffprobe -version
 
-RUN curl -L https://github.com/tootsuite/mastodon/archive/v${MASTODON_VERSION}.tar.gz | tar -xz --strip-components 1 -f - && \
-    bundle config --local set deployment 'true' && \
+# Download Mastodon source
+RUN curl -L https://github.com/tootsuite/mastodon/archive/v${MASTODON_VERSION}.tar.gz | tar -xz --strip-components 1 -f -
+
+RUN sed -i 's/MAX_CHARS = 500/MAX_CHARS = 2500/g' app/validators/status_length_validator.rb && \
+    sed -i "s/max_characters'], 500)/max_characters'], 2500)/g" app/javascript/mastodon/features/compose/containers/compose_form_container.js
+
+# Install Ruby dependencies
+RUN bundle config --local set deployment 'true' && \
     bundle config --local set without 'development test' && \
     bundle config --local set silence_root_warning true && \
     bundle install && \
@@ -100,7 +106,6 @@ RUN curl -L https://github.com/tootsuite/mastodon/archive/v${MASTODON_VERSION}.t
 
 RUN corepack enable && \
     corepack prepare --activate
-
 RUN yarn workspaces focus --production @mastodon/mastodon
 RUN yarn install
 
@@ -134,3 +139,4 @@ RUN ln -fs /app/data/system /app/code/public/system
 COPY start.sh cleanup.sh config.sh env.template cache-env.sh.template /app/pkg/
 
 CMD [ "/app/pkg/start.sh" ]
+