diff --git a/bin/spc-alpine-docker b/bin/spc-alpine-docker
index 3d135791..c4ff7d9c 100755
--- a/bin/spc-alpine-docker
+++ b/bin/spc-alpine-docker
@@ -52,7 +52,7 @@ fi
 # Detect docker env is setup
 if ! $DOCKER_EXECUTABLE images | grep -q cwcc-spc-$SPC_USE_ARCH; then
     echo "Docker container does not exist. Building docker image ..."
-    ALPINE_DOCKERFILE=$(cat << EOF
+    $DOCKER_EXECUTABLE build -t cwcc-spc-$SPC_USE_ARCH -f- . <<EOF
 FROM $ALPINE_FROM
 $SPC_USE_MIRROR
 RUN apk update
@@ -63,13 +63,8 @@ WORKDIR /app
 ADD ./src /app/src
 ADD ./composer.json /app/composer.json
 ADD ./bin /app/bin
-RUN composer update --no-dev
+RUN composer update --no-dev --classmap-authoritative
 EOF
-)
-    echo "$ALPINE_DOCKERFILE" > "$(pwd)"/Dockerfile
-
-    $DOCKER_EXECUTABLE build -t cwcc-spc-$SPC_USE_ARCH .
-    rm "$(pwd)"/Dockerfile
 fi
 
 # Check if in ci (local terminal can execute with -it)