diff --git a/php-fpm/Dockerfile-55 b/php-fpm/Dockerfile-55
index ae4dbdb3..f37f4d7d 100644
--- a/php-fpm/Dockerfile-55
+++ b/php-fpm/Dockerfile-55
@@ -11,9 +11,13 @@ RUN apt-get update && apt-get install -y \
     curl \
     libpng12-dev \
     libfreetype6-dev \
+    libmcrypt-dev \
     --no-install-recommends \
     && rm -r /var/lib/apt/lists/*
 
+# install mcrypt library
+RUN docker-php-ext-install mcrypt
+
 # configure gd library
 RUN docker-php-ext-configure gd \
     --enable-gd-native-ttf \
diff --git a/php-fpm/Dockerfile-56 b/php-fpm/Dockerfile-56
index f14a16f4..a5041dd0 100644
--- a/php-fpm/Dockerfile-56
+++ b/php-fpm/Dockerfile-56
@@ -11,9 +11,13 @@ RUN apt-get update && apt-get install -y \
     curl \
     libpng12-dev \
     libfreetype6-dev \
+    libmcrypt-dev \
     --no-install-recommends \
     && rm -r /var/lib/apt/lists/*
 
+# install mcrypt library
+RUN docker-php-ext-install mcrypt
+
 # configure gd library
 RUN docker-php-ext-configure gd \
     --enable-gd-native-ttf \
diff --git a/php-fpm/Dockerfile-70 b/php-fpm/Dockerfile-70
index d046d278..74113235 100644
--- a/php-fpm/Dockerfile-70
+++ b/php-fpm/Dockerfile-70
@@ -11,9 +11,13 @@ RUN apt-get update && apt-get install -y \
     curl \
     libpng12-dev \
     libfreetype6-dev \
+    libmcrypt-dev \
     --no-install-recommends \
     && rm -r /var/lib/apt/lists/*
 
+# install mcrypt library
+RUN docker-php-ext-install mcrypt
+
 # configure gd library
 RUN docker-php-ext-configure gd \
     --enable-gd-native-ttf \