diff --git a/ci-mercurial-core/Dockerfile b/ci-mercurial-core/Dockerfile
index 6fd5ed682f04b4627b881ddc04fbcdda37cd0b2a_Y2ktbWVyY3VyaWFsLWNvcmUvRG9ja2VyZmlsZQ==..7a593dbb1e0e332f48261f7433fa79c6860929f1_Y2ktbWVyY3VyaWFsLWNvcmUvRG9ja2VyZmlsZQ== 100644
--- a/ci-mercurial-core/Dockerfile
+++ b/ci-mercurial-core/Dockerfile
@@ -8,6 +8,11 @@
 
 USER root
 
+# We install moreutils to get `ts`, used to display timestamp for pytype
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends moreutils && \
+    apt-get -y clean
+
 RUN apt-get update && \
     apt-get install -y --no-install-recommends npm && \
     apt-get -y clean