diff --git a/Dockerfile b/Dockerfile
index 04972e6..000f1da 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,7 @@ RUN \
  echo "**** install packages ****" && \
  apk add --no-cache \
 	curl \
+	php7-ctype \
 	php7-gd \
 	php7-mysqli \
 	php7-pdo_pgsql \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index fd80948..2137cec 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -11,6 +11,7 @@ RUN \
  echo "**** install packages ****" && \
  apk add --no-cache \
 	curl \
+	php7-ctype \
 	php7-gd \
 	php7-mysqli \
 	php7-pdo_pgsql \
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index f836e2f..8d4b99e 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -11,6 +11,7 @@ RUN \
  echo "**** install packages ****" && \
  apk add --no-cache \
 	curl \
+	php7-ctype \
 	php7-gd \
 	php7-mysqli \
 	php7-pdo_pgsql \
diff --git a/readme-vars.yml b/readme-vars.yml
index cbb01e6..06e8742 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -62,6 +62,7 @@ app_setup_block: |
 
 # changelog
 changelogs:
+  - { date: "28.02.21:", desc: "Added php7-ctype." }
   - { date: "23.01.21:", desc: "Rebasing to alpine 3.13." }
   - { date: "01.06.20:", desc: "Rebasing to alpine 3.12." }
   - { date: "29.04.20:", desc: "Add donation links for LibreSpeed to Github sponsor button and container log." }