diff --git a/backend/Dockerfile b/backend/Dockerfile
index 588a3867f..83af4317b 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 FROM node:25.6.0-alpine AS base
 LABEL org.label-schema.name="ocelot.social:backend"
 LABEL org.label-schema.description="Backend of the Social Network Software ocelot.social"
@@ -28,13 +29,15 @@ ONBUILD COPY ./branding/email/ src/middleware/helpers/email/
 ONBUILD COPY ./branding/middlewares/ src/middleware/branding/
 ONBUILD COPY ./branding/data/ src/db/data
 ONBUILD COPY ./branding/public/ public/
-ONBUILD RUN yarn install --production=false --frozen-lockfile --non-interactive
+ONBUILD RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    yarn install --production=false --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 ONBUILD RUN yarn run build
 ONBUILD RUN mkdir /build
 ONBUILD RUN cp -r ./build /build
 ONBUILD RUN cp -r ./public /build
 ONBUILD RUN cp -r ./package.json yarn.lock /build
-ONBUILD RUN cd /build && yarn install --production=true --frozen-lockfile --non-interactive
+ONBUILD RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    cd /build && yarn install --production=true --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 
 FROM build AS test
 # required for the migrations
diff --git a/webapp/Dockerfile b/webapp/Dockerfile
index ceb485c8f..86dc9b661 100644
--- a/webapp/Dockerfile
+++ b/webapp/Dockerfile
@@ -1,9 +1,11 @@
+# syntax=docker/dockerfile:1
 FROM node:25.6.0-alpine AS styleguide
 RUN apk --no-cache add git python3 make g++
 RUN mkdir -p /app
 WORKDIR /app
 COPY styleguide .
-RUN yarn install --production=false --frozen-lockfile --non-interactive
+RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    yarn install --production=false --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 RUN yarn run build:lib
 
 FROM node:25.6.0-alpine AS ui-library
@@ -11,7 +13,8 @@ RUN apk --no-cache add git python3 make g++
 RUN mkdir -p /app
 WORKDIR /app
 COPY packages/ui .
-RUN yarn install --production=false --frozen-lockfile --non-interactive
+RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    yarn install --production=false --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 RUN yarn run build
 
 FROM node:25.6.0-alpine AS base
@@ -42,7 +45,8 @@ COPY webapp/ .
 ONBUILD COPY webap[p]/brandin[g]/ .
 ONBUILD COPY brandin[g]/ .
 ONBUILD RUN tools/merge-locales.sh
-ONBUILD RUN yarn install --production=false --frozen-lockfile --non-interactive
+ONBUILD RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    yarn install --production=false --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 ONBUILD RUN yarn run build
 ONBUILD RUN mkdir /build
 ONBUILD RUN cp -r ./.nuxt /build
@@ -56,13 +60,15 @@ ONBUILD RUN cp -r ./static /build
 ONBUILD RUN cp -r ./locales /build
 ONBUILD RUN cp -r ./package.json ./yarn.lock /build
 ONBUILD RUN cp -r ./scripts /build
-ONBUILD RUN cd /build && yarn install --production=true --frozen-lockfile --non-interactive
+ONBUILD RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    cd /build && yarn install --production=true --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 
 FROM base AS test_build
 ENV NODE_ENV=test
 COPY webapp/. .
 RUN tools/merge-locales.sh
-RUN yarn install --production=false --frozen-lockfile --non-interactive
+RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    yarn install --production=false --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 RUN yarn run build
 RUN mkdir /build
 RUN cp -r ./.nuxt /build
@@ -73,7 +79,8 @@ RUN cp -r ./static /build
 RUN cp -r ./locales /build
 RUN cp -r ./package.json ./yarn.lock /build
 RUN cp -r ./scripts /build
-RUN cd /build && yarn install --frozen-lockfile --non-interactive
+RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    cd /build && yarn install --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 
 FROM test_build AS test
 CMD ["/bin/bash", "-c", "yarn run dev"]
diff --git a/webapp/Dockerfile.maintenance b/webapp/Dockerfile.maintenance
index 28a303bcd..58fa048b0 100644
--- a/webapp/Dockerfile.maintenance
+++ b/webapp/Dockerfile.maintenance
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 FROM nginx:1.29.5-alpine AS base
 LABEL org.label-schema.name="ocelot.social:maintenance"
 LABEL org.label-schema.description="Maintenance page of the Social Network Software ocelot.social"
@@ -13,7 +14,8 @@ RUN apk --no-cache add git python3 make g++
 RUN mkdir -p /app
 WORKDIR /app
 COPY styleguide .
-RUN yarn install --production=false --frozen-lockfile --non-interactive
+RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    yarn install --production=false --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 RUN yarn run build:lib
 
 FROM node:25.6.0-alpine AS ui-library
@@ -21,7 +23,8 @@ RUN apk --no-cache add git python3 make g++
 RUN mkdir -p /app
 WORKDIR /app
 COPY packages/ui .
-RUN yarn install --production=false --frozen-lockfile --non-interactive
+RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    yarn install --production=false --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 RUN yarn run build
 
 FROM node:25.6.0-alpine AS build
@@ -38,7 +41,8 @@ RUN rm -rf ./pages
 ONBUILD COPY webap[p]/brandin[g]/ .
 ONBUILD COPY brandin[g]/ .
 ONBUILD RUN tools/merge-locales.sh
-ONBUILD RUN yarn install --production=false --frozen-lockfile --non-interactive
+ONBUILD RUN --mount=type=cache,target=/yarn-cache,sharing=locked \
+    yarn install --production=false --frozen-lockfile --non-interactive --cache-folder /yarn-cache
 ONBUILD RUN cp -r maintenance/source/* ./
 ONBUILD RUN yarn run generate