diff --git a/urlwatch/Dockerfile b/urlwatch/Dockerfile
index 6a90ead..4318e8b 100644
--- a/urlwatch/Dockerfile
+++ b/urlwatch/Dockerfile
@@ -6,17 +6,18 @@ FROM alpine:3
 LABEL maintainer="EasyPi Software Foundation"
 
 RUN set -xe \
-    && apk add --no-cache ca-certificates \
-                          build-base      \
-                          libffi-dev      \
-                          libxml2         \
-                          libxml2-dev     \
-                          libxslt         \
-                          libxslt-dev     \
-                          openssl-dev     \
-                          py3-pip         \
-                          python3         \
-                          python3-dev     \
+    && apk add --no-cache ca-certificates  \
+                          build-base       \
+                          libffi-dev       \
+                          libxml2          \
+                          libxml2-dev      \
+                          libxslt          \
+                          libxslt-dev      \
+                          openssl-dev      \
+                          py3-cryptography \
+                          py3-pip          \
+                          python3          \
+                          python3-dev      \
     && pip3 install appdirs       \
                     cssselect     \
                     keyring       \