diff --git a/aleksis/core/settings.py b/aleksis/core/settings.py
index 8458d65c01d5c89d958d401418e6f7714017eea3..887e63cc66aa3e666183118a373f47d53ec400e4 100644
--- a/aleksis/core/settings.py
+++ b/aleksis/core/settings.py
@@ -281,7 +281,7 @@ CONSTANCE_CONFIG = {
     "COLOUR_PRIMARY": ("#007bff", _("Primary colour")),
     "COLOUR_SECONDARY": ("#007bff", _("Secondary colour")),
     "MAIL_OUT_NAME": ("AlekSIS", _("Mail out name")),
-    "MAIL_OUT": ("aleksis@example.com", _("Mail out address"), "email_field'),
+    "MAIL_OUT": ("aleksis@example.com", _("Mail out address"), "email_field"),
     "PRIVACY_URL": ("", _("Link to privacy policy"), "url_field"),
     "IMPRINT_URL": ("", _("Link to imprint"), "url_field"),
 }
diff --git a/poetry.lock b/poetry.lock
index 9d000b9d8897277815c951e71190cd424cd8328e..45686eb746a70eb399f3b9e12c6f574f43fa05e2 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -161,9 +161,6 @@ optional = false
 python-versions = "*"
 version = "5.0.6"
 
-[package.dependencies]
-six = "*"
-
 [[package]]
 category = "dev"
 description = "Code coverage measurement for Python"
@@ -430,6 +427,10 @@ version = "3.0.1"
 Django = ">=1.11.3"
 babel = "*"
 
+[package.dependencies.phonenumbers]
+optional = true
+version = ">=7.0.2"
+
 [package.extras]
 phonenumbers = ["phonenumbers (>=7.0.2)"]
 phonenumberslite = ["phonenumberslite (>=7.0.2)"]
@@ -448,6 +449,17 @@ Django = ">=1.11"
 [package.extras]
 tests = ["tox"]
 
+[[package]]
+category = "main"
+description = "A Django app to include a manifest.json and Service Worker instance to enable progressive web app behavior"
+name = "django-pwa"
+optional = false
+python-versions = "*"
+version = "1.0.6"
+
+[package.dependencies]
+django = ">=1.8"
+
 [[package]]
 category = "main"
 description = "SASS processor to compile SCSS files into *.css, while rendering, or offline."
@@ -1247,7 +1259,7 @@ category = "main"
 description = "YAML parser and emitter for Python"
 name = "pyyaml"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = "*"
 version = "5.2"
 
 [[package]]
@@ -1671,7 +1683,7 @@ testing = ["pathlib2", "contextlib2", "unittest2"]
 ldap = ["django-auth-ldap"]
 
 [metadata]
-content-hash = "bca26513f4520039661e719a675e767eef8a19273d1430cd0810ea8a10ea40da"
+content-hash = "4a3c439532738081f6bdb12939df1ce22f2d338fca6344df269d3bd08ee7026a"
 python-versions = "^3.7"
 
 [metadata.files]
@@ -1854,6 +1866,10 @@ django-picklefield = [
     {file = "django-picklefield-2.0.tar.gz", hash = "sha256:f1733a8db1b6046c0d7d738e785f9875aa3c198215de11993463a9339aa4ea24"},
     {file = "django_picklefield-2.0-py2.py3-none-any.whl", hash = "sha256:9052f2dcf4882c683ce87b4356f29b4d014c0dad645b6906baf9f09571f52bc8"},
 ]
+django-pwa = [
+    {file = "django-pwa-1.0.6.tar.gz", hash = "sha256:b3f1ad0c5241fae4c7505423540de4db93077d7c88416ff6d2af545ffe209f34"},
+    {file = "django_pwa-1.0.6-py3-none-any.whl", hash = "sha256:9306105fcb637ae16fea6527be4b147d45fd53db85efb1d4f61dfea6bf793e56"},
+]
 django-sass-processor = [
     {file = "django-sass-processor-0.8.tar.gz", hash = "sha256:e039551994feaaba6fcf880412b25a772dd313162a34cbb4289814988cfae340"},
 ]
@@ -2428,7 +2444,6 @@ urllib3 = [
 ]
 wcwidth = [
     {file = "wcwidth-0.1.8-py2.py3-none-any.whl", hash = "sha256:8fd29383f539be45b20bd4df0dc29c20ba48654a41e661925e612311e9f3c603"},
-    {file = "wcwidth-0.1.8.tar.gz", hash = "sha256:f28b3e8a6483e5d49e7f8949ac1a78314e740333ae305b4ba5defd3e74fb37a8"},
 ]
 yubiotp = [
     {file = "YubiOTP-0.2.2.post1-py2.py3-none-any.whl", hash = "sha256:7e281801b24678f4bda855ce8ab975a7688a912f5a6cb22b6c2b16263a93cbd2"},