diff --git a/optional/clamav/Dockerfile b/optional/clamav/Dockerfile
index efad01ad..7ce41453 100644
--- a/optional/clamav/Dockerfile
+++ b/optional/clamav/Dockerfile
@@ -2,7 +2,7 @@ ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip bash \
+    python3 py3-pip bash tzdata \
   && pip3 install --upgrade pip
 # Image specific layers under this line
 RUN apk add --no-cache clamav rsyslog wget clamav-libunrar
diff --git a/optional/fetchmail/Dockerfile b/optional/fetchmail/Dockerfile
index d3397a22..fc564a4b 100644
--- a/optional/fetchmail/Dockerfile
+++ b/optional/fetchmail/Dockerfile
@@ -3,7 +3,7 @@ FROM $DISTRO
 
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip bash \
+    python3 py3-pip bash tzdata \
   && pip3 install --upgrade pip
 
 # Image specific layers under this line
diff --git a/optional/postgresql/Dockerfile b/optional/postgresql/Dockerfile
index ab197b62..ade12a24 100644
--- a/optional/postgresql/Dockerfile
+++ b/optional/postgresql/Dockerfile
@@ -2,7 +2,7 @@ ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip bash py3-multidict \
+    python3 py3-pip bash py3-multidict tzdata \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube
diff --git a/optional/radicale/Dockerfile b/optional/radicale/Dockerfile
index 21c1d437..cecaa2d3 100644
--- a/optional/radicale/Dockerfile
+++ b/optional/radicale/Dockerfile
@@ -3,7 +3,7 @@ FROM $DISTRO
 
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip bash \
+    python3 py3-pip bash tzdata \
   && pip3 install --upgrade pip
 
 # Image specific layers under this line
diff --git a/optional/traefik-certdumper/Dockerfile b/optional/traefik-certdumper/Dockerfile
index a7127ce1..ce9b4929 100644
--- a/optional/traefik-certdumper/Dockerfile
+++ b/optional/traefik-certdumper/Dockerfile
@@ -1,6 +1,6 @@
 FROM ldez/traefik-certs-dumper
 
-RUN apk --no-cache add inotify-tools util-linux bash
+RUN apk --no-cache add inotify-tools util-linux bash tzdata
 
 COPY run.sh /
 
diff --git a/optional/unbound/Dockerfile b/optional/unbound/Dockerfile
index da979496..fde67480 100644
--- a/optional/unbound/Dockerfile
+++ b/optional/unbound/Dockerfile
@@ -2,7 +2,7 @@ ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
 # python3 shared with most images
 RUN apk add --no-cache \
-    python3 py3-pip git bash py3-multidict \
+    python3 py3-pip git bash py3-multidict tzdata \
   && pip3 install --upgrade pip
 
 # Shared layer between nginx, dovecot, postfix, postgresql, rspamd, unbound, rainloop, roundcube