diff --git a/Dockerfile b/Dockerfile
index 5878dbe..9e3d6ce 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,7 @@ WORKDIR /usr/src/app
 
 # Install python requirements
 COPY requirements.txt ./
+RUN pip install --no-cache-dir --upgrade pip
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Make dirs
diff --git a/requirements.txt b/requirements.txt
index 5d0ac9d..d9996d5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,5 @@ ics>=0.7,<0.8
 caldav>=0.7.1,<0.8
 lockfile>=0.12.2,<0.13
 google-auth-oauthlib>=0.4.2,<0.5
-requests-oauthlib>=1.3.0,<1.4
\ No newline at end of file
+requests-oauthlib>=1.3.0,<1.4
+packaging