diff --git a/Dockerfile b/Dockerfile
index 3716eb6..be6c54c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -26,11 +26,8 @@ RUN apk update && apk add --no-cache \
     && cd .. && rm -rf php-ast \
     && pecl install redis \
     && docker-php-ext-enable redis \
-    && apk del wget gnupg g++ icu-dev libzip-dev
-
-RUN apk add postgresql${POSTGRES_VERSION}-client
-
-RUN apk del oniguruma-dev linux-headers gcc make autoconf
+    && apk add postgresql${POSTGRES_VERSION}-client \
+    && apk del wget gnupg libpq-dev icu-dev oniguruma-dev libzip-dev linux-headers gcc g++ make autoconf
 
 # "ERROR: Package cache is not enabled." \
 # https://github.com/gliderlabs/docker-alpine/issues/224