diff --git a/swoole/7.4/Dockerfile b/swoole/7.4/Dockerfile
index df651f6..6d94722 100644
--- a/swoole/7.4/Dockerfile
+++ b/swoole/7.4/Dockerfile
@@ -21,6 +21,7 @@ RUN set -ex \
     && php -v \
     && php -m \
     && php --ri swoole \
+    && apk add --no-cache --repository https://mirrors.aliyun.com/alpine/edge/testing gnu-libiconv \
     #  ---------- some config ----------
     && cd /etc/php7 \
     # - config PHP
diff --git a/swoole/8.1/Dockerfile b/swoole/8.1/Dockerfile
index fa2b7ea..b741561 100644
--- a/swoole/8.1/Dockerfile
+++ b/swoole/8.1/Dockerfile
@@ -21,6 +21,7 @@ RUN set -ex \
     && php -v \
     && php -m \
     && php --ri swoole \
+    && apk add --no-cache --repository https://mirrors.aliyun.com/alpine/edge/testing gnu-libiconv  \
     #  ---------- some config ----------
     && cd /etc/php81 \
     # - config PHP
diff --git a/swoole/8.2/Dockerfile b/swoole/8.2/Dockerfile
index 4cd07cc..8572d34 100644
--- a/swoole/8.2/Dockerfile
+++ b/swoole/8.2/Dockerfile
@@ -21,6 +21,7 @@ RUN set -ex \
     && php -v \
     && php -m \
     && php --ri swoole \
+    && apk add --no-cache --repository https://mirrors.aliyun.com/alpine/edge/testing gnu-libiconv \
     #  ---------- some config ----------
     && cd /etc/php82 \
     # - config PHP
diff --git a/swoole/8.3/Dockerfile b/swoole/8.3/Dockerfile
index fd4e3e5..6fcd006 100644
--- a/swoole/8.3/Dockerfile
+++ b/swoole/8.3/Dockerfile
@@ -21,6 +21,7 @@ RUN set -ex \
     && php -v \
     && php -m \
     && php --ri swoole \
+    && apk add --no-cache --repository https://mirrors.aliyun.com/alpine/edge/testing gnu-libiconv \
     #  ---------- some config ----------
     && cd /etc/php83 \
     # - config PHP