diff --git a/changelog.md b/changelog.md
index 12e0900..941c54d 100644
--- a/changelog.md
+++ b/changelog.md
@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+# [2.1.8] - 2026-03-11
+- Fixed - Add missing `igbinary` and `redis` PHP extensions to the slic and WordPress Dockerfiles.
+
 # [2.1.7] - 2026-02-02
 - Fixed - Preserve staged PHP versions (from `slic php-version set X.Y --skip-rebuild`) when a project's `.env.slic.local` file would otherwise override them. Staged versions now correctly take precedence over project-specific PHP version overrides.
 
diff --git a/containers/slic/Dockerfile b/containers/slic/Dockerfile
index 8ba0bd6..e19d3a6 100644
--- a/containers/slic/Dockerfile
+++ b/containers/slic/Dockerfile
@@ -34,7 +34,7 @@ RUN chmod a+rx /usr/local/bin/wp /usr/local/bin/install-php-extensions
 # PHP extensions (heavy compilation step with cache mount)
 # -------------------------------
 RUN --mount=type=cache,target=/tmp/ipe-cache,sharing=locked \
-    install-php-extensions xdebug pdo pdo_mysql mysqli zip uopz pcntl sockets intl exif gd
+    install-php-extensions xdebug pdo pdo_mysql mysqli zip uopz pcntl sockets intl exif gd igbinary redis
 
 # -------------------------------
 # System dependencies (with cache mount for speed)
diff --git a/containers/wordpress/Dockerfile b/containers/wordpress/Dockerfile
index 27c0a87..6355159 100644
--- a/containers/wordpress/Dockerfile
+++ b/containers/wordpress/Dockerfile
@@ -21,7 +21,7 @@ ADD https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar /u
 RUN --mount=type=cache,target=/tmp/ipe-cache,sharing=locked \
     chmod a+x /usr/local/bin/install-php-extensions && \
     chmod a+rx /usr/local/bin/wp && \
-    install-php-extensions xdebug
+    install-php-extensions xdebug igbinary redis
 
 # -------------------------------
 # WordPress version update (PHP 7.4)
diff --git a/slic.php b/slic.php
index af65fcc..832c8ce 100644
--- a/slic.php
+++ b/slic.php
@@ -54,7 +54,7 @@
 ] );
 
 $cli_name = 'slic';
-const CLI_VERSION = '2.1.7';
+const CLI_VERSION = '2.1.8';
 
 // If the run-time option `-q`, for "quiet", is specified, then do not print the header.
 if ( in_array( '-q', $argv, true ) || ( in_array( 'exec', $argv, true ) && ! in_array( 'help', $argv, true ) ) ) {