diff --git a/php-unit-test/5.6/Dockerfile b/php-unit-test/5.6/Dockerfile
index e892ac9ab99d8da922a7b8a159c29145644ccd7b..6b1c64e70ffe971ff8e20d2ec9ae4b71592b3e5c 100644
--- a/php-unit-test/5.6/Dockerfile
+++ b/php-unit-test/5.6/Dockerfile
@@ -14,7 +14,8 @@ LABEL org.label-schema.build-date=$BUILD_DATE \
 
 RUN apk add --no-cache bash nodejs nodejs-npm $PHPIZE_DEPS \
     && pecl install xdebug-2.5.0 \
-    && docker-php-ext-enable xdebug
+    && docker-php-ext-enable xdebug \
+    && apk del --no-cache $PHPIZE_DEPS
 RUN curl -o /usr/local/bin/composer https://getcomposer.org/composer.phar \
   && chmod 755 /usr/local/bin/composer
 
diff --git a/php-unit-test/7.0/Dockerfile b/php-unit-test/7.0/Dockerfile
index 3297cd3e5ce3a5eb3327cb427bac78078fffdb12..8ef133bb2414c7427f28762b70c197f9f505acbe 100644
--- a/php-unit-test/7.0/Dockerfile
+++ b/php-unit-test/7.0/Dockerfile
@@ -14,7 +14,8 @@ LABEL org.label-schema.build-date=$BUILD_DATE \
 
 RUN apk add --no-cache bash nodejs nodejs-npm $PHPIZE_DEPS \
     && pecl install xdebug \
-    && docker-php-ext-enable xdebug
+    && docker-php-ext-enable xdebug \
+    && apk del --no-cache $PHPIZE_DEPS
 RUN curl -o /usr/local/bin/composer https://getcomposer.org/composer.phar \
   && chmod 755 /usr/local/bin/composer
 
diff --git a/php-unit-test/7.1/Dockerfile b/php-unit-test/7.1/Dockerfile
index f3b93d70836c94cdace26bb59f5cf19c7fa45ea8..63ce09cb3f9dc803d13341d5a6edeab378b2c7cd 100644
--- a/php-unit-test/7.1/Dockerfile
+++ b/php-unit-test/7.1/Dockerfile
@@ -14,7 +14,8 @@ LABEL org.label-schema.build-date=$BUILD_DATE \
 
 RUN apk add --no-cache bash nodejs nodejs-npm $PHPIZE_DEPS \
     && pecl install xdebug \
-    && docker-php-ext-enable xdebug
+    && docker-php-ext-enable xdebug \
+    && apk del --no-cache $PHPIZE_DEPS
 RUN curl -o /usr/local/bin/composer https://getcomposer.org/composer.phar \
   && chmod 755 /usr/local/bin/composer
 
diff --git a/php-unit-test/7.2/Dockerfile b/php-unit-test/7.2/Dockerfile
index 1a3c7fedc2f74bd3d612005ed2ec838e94bee8a7..97bdcd162a98ea51fc46b6bc3885aff7b827d710 100644
--- a/php-unit-test/7.2/Dockerfile
+++ b/php-unit-test/7.2/Dockerfile
@@ -14,7 +14,8 @@ LABEL org.label-schema.build-date=$BUILD_DATE \
 
 RUN apk add --no-cache bash nodejs nodejs-npm $PHPIZE_DEPS \
     && pecl install xdebug \
-    && docker-php-ext-enable xdebug
+    && docker-php-ext-enable xdebug \
+    && apk del --no-cache $PHPIZE_DEPS
 RUN curl -o /usr/local/bin/composer https://getcomposer.org/composer.phar \
   && chmod 755 /usr/local/bin/composer