diff --git a/images/php-fpm/8.1.Dockerfile b/images/php-fpm/8.1.Dockerfile
index 1f7ebf744..aa2837b78 100644
--- a/images/php-fpm/8.1.Dockerfile
+++ b/images/php-fpm/8.1.Dockerfile
@@ -151,7 +151,7 @@ RUN mkdir -p /tmp/newrelic && cd /tmp/newrelic \
     && fix-permissions /usr/local/etc/
 
 # Add blackfire probe and agent.
-ENV BLACKFIRE_VERSION=2.28.20
+ENV BLACKFIRE_VERSION=2.28.21
 RUN version=$(php -r "echo PHP_MAJOR_VERSION.PHP_MINOR_VERSION;") \
     && architecture=$(case $(uname -m) in x86_64 | amd64) echo "amd64" ;; aarch64 | arm64 | armv8) echo "arm64" ;; *) echo "amd64" ;; esac) \
     && mkdir -p /blackfire \
diff --git a/images/php-fpm/8.2.Dockerfile b/images/php-fpm/8.2.Dockerfile
index cd736d290..309644a22 100644
--- a/images/php-fpm/8.2.Dockerfile
+++ b/images/php-fpm/8.2.Dockerfile
@@ -151,7 +151,7 @@ RUN mkdir -p /tmp/newrelic && cd /tmp/newrelic \
     && fix-permissions /usr/local/etc/
 
 # Add blackfire probe and agent.
-ENV BLACKFIRE_VERSION=2.28.20
+ENV BLACKFIRE_VERSION=2.28.21
 RUN version=$(php -r "echo PHP_MAJOR_VERSION.PHP_MINOR_VERSION;") \
     && architecture=$(case $(uname -m) in x86_64 | amd64) echo "amd64" ;; aarch64 | arm64 | armv8) echo "arm64" ;; *) echo "amd64" ;; esac) \
     && mkdir -p /blackfire \
diff --git a/images/php-fpm/8.3.Dockerfile b/images/php-fpm/8.3.Dockerfile
index f6ed29c8c..203d5fec5 100644
--- a/images/php-fpm/8.3.Dockerfile
+++ b/images/php-fpm/8.3.Dockerfile
@@ -160,7 +160,7 @@ RUN mkdir -p /tmp/newrelic && cd /tmp/newrelic \
     && fix-permissions /usr/local/etc/
 
 # Add blackfire probe and agent.
-ENV BLACKFIRE_VERSION=2.28.20
+ENV BLACKFIRE_VERSION=2.28.21
 RUN version=$(php -r "echo PHP_MAJOR_VERSION.PHP_MINOR_VERSION;") \
     && architecture=$(case $(uname -m) in x86_64 | amd64) echo "amd64" ;; aarch64 | arm64 | armv8) echo "arm64" ;; *) echo "amd64" ;; esac) \
     && mkdir -p /blackfire \