diff --git a/Dockerfile b/Dockerfile
index 0994b741..bc752b32 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,7 @@ ADD . /app
 WORKDIR /app
 
 RUN \
+    apt-get update && \
     apt-get install -y -qq libexpat1-dev gcc libssl-dev libffi-dev && \
     make clean && \
     pip install -r pypy-requirements.txt && \
diff --git a/Dockerfile.python27 b/Dockerfile.python27
index 3d250481..41eca88b 100644
--- a/Dockerfile.python27
+++ b/Dockerfile.python27
@@ -6,6 +6,7 @@ COPY . /app
 WORKDIR /app
 
 RUN \
+    apt-get update && \
     apt-get install -y -qq libexpat1-dev gcc libssl-dev libffi-dev && \
     make clean && \
     pip install -r requirements.txt && \