diff --git a/core/admin/Dockerfile b/core/admin/Dockerfile
index 4d6aa75a..e4d870e0 100644
--- a/core/admin/Dockerfile
+++ b/core/admin/Dockerfile
@@ -37,7 +37,7 @@ WORKDIR /app
 COPY requirements-prod.txt requirements.txt
 RUN set -eu \
  && apk add --no-cache libressl curl postgresql-libs mariadb-connector-c \
- && pip install --no-cache-dir --extra-index-url=https://www.piwheels.org/simple -r requirements.txt --only-binary=:all: --no-binary=Flask-bootstrap,PyYAML,SQLAlchemy \
+ && pip install --no-cache-dir -r requirements.txt --only-binary=:all: --no-binary=Flask-bootstrap,PyYAML,SQLAlchemy \
  || ( apk add --no-cache --virtual build-dep libressl-dev libffi-dev python3-dev build-base postgresql-dev mariadb-connector-c-dev cargo \
  && pip install --upgrade pip \
  && pip install -r requirements.txt \
diff --git a/core/postfix/Dockerfile b/core/postfix/Dockerfile
index b048a15e..373e5c8d 100644
--- a/core/postfix/Dockerfile
+++ b/core/postfix/Dockerfile
@@ -22,7 +22,7 @@ RUN apk add --no-cache --virtual .build-deps gcc musl-dev python3-dev \
 
 # Image specific layers under this line
 # Building pycares from source requires py3-wheel and libffi-dev packages
-RUN pip install --no-cache-dir --extra-index-url=https://www.piwheels.org/simple --only-binary=:all: postfix-mta-sts-resolver==1.0.1 || (apk add --no-cache --virtual .build-deps gcc musl-dev python3-dev py3-wheel libffi-dev \
+RUN pip install --no-cache-dir --only-binary=:all: postfix-mta-sts-resolver==1.0.1 || (apk add --no-cache --virtual .build-deps gcc musl-dev python3-dev py3-wheel libffi-dev \
   && pip3 install postfix-mta-sts-resolver==1.0.1 \
   && apk del .build-deps )