diff --git a/12.0.Dockerfile b/12.0.Dockerfile
index 2bd67e188b3d87c0e419f793e3b421532531df96..424813569e4c78c288e9e0e7a1330f8f519a3ea3 100644
--- a/12.0.Dockerfile
+++ b/12.0.Dockerfile
@@ -9,6 +9,7 @@ ENV APT_DEPS='build-essential libldap2-dev libsasl2-dev python3-dev python3-whee
 RUN set -x; \
         apt-get update &&\
         apt-get install -y --no-install-recommends \
+            apt-transport-https \
             ca-certificates \
             curl \
             fontconfig \
diff --git a/12.0.Dockerfile.arm b/12.0.Dockerfile.arm
index 3f0be55d9d38cc3ac148b1e96f2d7051083f15dd..543007eaec977fb6199c382fd5f2bac74044a8c6 100644
--- a/12.0.Dockerfile.arm
+++ b/12.0.Dockerfile.arm
@@ -9,6 +9,7 @@ ENV APT_DEPS='build-essential libldap2-dev libpq-dev libxml2-dev zlib1g-dev libx
 RUN set -x; \
         apt-get update &&\
         apt-get install -y --no-install-recommends \
+            apt-transport-https \
             ca-certificates \
             curl \
             fontconfig \
diff --git a/12.0_ml.Dockerfile b/12.0_ml.Dockerfile
index 695668a44ca9891ba7625eda1590827501053a3f..76bbba422bfcf9e6b2aa63e2828ba2ebbaad7e14 100644
--- a/12.0_ml.Dockerfile
+++ b/12.0_ml.Dockerfile
@@ -9,6 +9,7 @@ ENV APT_DEPS='build-essential libldap2-dev libsasl2-dev python3-dev python3-whee
 RUN set -x; \
         apt-get update &&\
         apt-get install -y --no-install-recommends \
+            apt-transport-https \
             ca-certificates \
             curl \
             fontconfig \
diff --git a/12.0_py3.6.Dockerfile b/12.0_py3.6.Dockerfile
index 2c493a63dc7823f3fbec1ac37c2ce841b8afc630..9e7bc03a4c4173c736bc7c0828ef59a6ccf7b5b1 100644
--- a/12.0_py3.6.Dockerfile
+++ b/12.0_py3.6.Dockerfile
@@ -9,6 +9,7 @@ ENV APT_DEPS='build-essential libjpeg-dev libldap2-dev libsasl2-dev libpq-dev li
 RUN set -x; \
         apt-get update &&\
         apt-get install -y --no-install-recommends \
+            apt-transport-https \
             curl \
             git \
             gnupg \