diff --git a/Dockerfile b/Dockerfile
index be2b693..458000c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,7 +23,8 @@ RUN \
     libidn \
     nodejs \
     ruby \
-    ruby-bundler && \
+    ruby-bundler \
+    yaml && \
   apk add --no-cache --virtual=build-dependencies \
     build-base \
     icu-dev \
@@ -33,7 +34,8 @@ RUN \
     libxslt-dev \
     openssl-dev \
     ruby-dev \
-    yarn && \
+    yarn \
+    yaml-dev && \
   echo "**** install mastodon ****" && \
   mkdir -p /app/www && \
   if [ -z ${MASTODON_VERSION+x} ]; then \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index a0a0728..2807fa0 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -23,7 +23,8 @@ RUN \
     libidn \
     nodejs \
     ruby \
-    ruby-bundler && \
+    ruby-bundler \
+    yaml && \
   apk add --no-cache --virtual=build-dependencies \
     build-base \
     gcompat \
@@ -35,6 +36,7 @@ RUN \
     openssl-dev \
     python3-dev \
     ruby-dev \
+    yaml-dev \
     yarn && \
   echo "**** install mastodon ****" && \
   mkdir -p /app/www && \