diff --git a/11.0/Dockerfile b/11.0/Dockerfile
index 015fbf2..57ab859 100644
--- a/11.0/Dockerfile
+++ b/11.0/Dockerfile
@@ -48,6 +48,7 @@ RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > /etc
         && rm -rf "$GNUPGHOME" \
         && apt-get update  \
         && apt-get install --no-install-recommends -y postgresql-client \
+        && rm -f /etc/apt/sources.list.d/pgdg.list \
         && rm -rf /var/lib/apt/lists/*
 
 # Install Odoo
diff --git a/12.0/Dockerfile b/12.0/Dockerfile
index 791890b..26d6071 100644
--- a/12.0/Dockerfile
+++ b/12.0/Dockerfile
@@ -48,6 +48,7 @@ RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > /etc
         && rm -rf "$GNUPGHOME" \
         && apt-get update  \
         && apt-get install --no-install-recommends -y postgresql-client \
+        && rm -f /etc/apt/sources.list.d/pgdg.list \
         && rm -rf /var/lib/apt/lists/*
 
 # Install rtlcss (on Debian stretch)
diff --git a/13.0/Dockerfile b/13.0/Dockerfile
index 9213acd..9ec1be3 100644
--- a/13.0/Dockerfile
+++ b/13.0/Dockerfile
@@ -46,6 +46,7 @@ RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main' > /etc/
         && rm -rf "$GNUPGHOME" \
         && apt-get update  \
         && apt-get install --no-install-recommends -y postgresql-client \
+        && rm -f /etc/apt/sources.list.d/pgdg.list \
         && rm -rf /var/lib/apt/lists/*
 
 # Install rtlcss (on Debian buster)