diff --git a/5.5/Dockerfile b/5.5/Dockerfile
index e20d7ed0..9fbb02ff 100644
--- a/5.5/Dockerfile
+++ b/5.5/Dockerfile
@@ -2,7 +2,7 @@ FROM buildpack-deps
 
 RUN gpg --keyserver pgp.mit.edu --recv-keys 0BD78B5F97500D450838F95DFE857D9A90D90EC1 0B96609E270F565C13292B24C13C70B87267B52D
 
-ENV PHP_VERSION 5.5.15
+ENV PHP_VERSION 5.5.16
 
 RUN set -x \
 	&& apt-get update && apt-get install -y curl && rm -r /var/lib/apt/lists/* \
diff --git a/5.5/apache/Dockerfile b/5.5/apache/Dockerfile
index cfe2d05c..dd554821 100644
--- a/5.5/apache/Dockerfile
+++ b/5.5/apache/Dockerfile
@@ -2,7 +2,7 @@ FROM buildpack-deps
 
 RUN gpg --keyserver pgp.mit.edu --recv-keys 0BD78B5F97500D450838F95DFE857D9A90D90EC1 0B96609E270F565C13292B24C13C70B87267B52D
 
-ENV PHP_VERSION 5.5.15
+ENV PHP_VERSION 5.5.16
 
 RUN set -x \
 	&& apt-get update && apt-get install -y curl && rm -r /var/lib/apt/lists/* \