diff --git a/core/dovecot/Dockerfile b/core/dovecot/Dockerfile
index 870cbe80..bb67370c 100644
--- a/core/dovecot/Dockerfile
+++ b/core/dovecot/Dockerfile
@@ -2,7 +2,7 @@ ARG DISTRO=alpine:3.10
 FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip git bash py3-multidict \
+    python3 py3-pip git bash py3-multidict py3-yarl \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube
diff --git a/core/postfix/Dockerfile b/core/postfix/Dockerfile
index 65a519c6..187b30f1 100644
--- a/core/postfix/Dockerfile
+++ b/core/postfix/Dockerfile
@@ -2,7 +2,7 @@ ARG DISTRO=alpine:3.10
 FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip git bash py3-multidict \
+    python3 py3-pip git bash py3-multidict py3-yarl \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube