diff --git a/Dockerfile b/Dockerfile
index 61a719eecd..0438bc39a5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,8 +19,8 @@ RUN git clone https://github.com/rbenv/rbenv.git ${RBENV_ROOT} && \
     gem install bundler --version=1.17.2
 
 # Postgres
-RUN sh -c "echo 'deb http://apt.postgresql.org/pub/repos/apt/ bionic-pgdg main' > /etc/apt/sources.list.d/pgdg.list" && \
-    wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | apt-key add - && \
+RUN sh -c "echo 'deb https://apt.postgresql.org/pub/repos/apt/ bionic-pgdg main' > /etc/apt/sources.list.d/pgdg.list" && \
+    wget --quiet -O - https://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | apt-key add - && \
     apt-get update && \
     apt-get install -yqq --no-install-recommends postgresql-client-9.5 libpq-dev