diff --git a/Dockerfile b/Dockerfile
index e5ca47e23..0dccc0fd2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM sitespeedio/webbrowsers:chrome-91.0-firefox-90.0-edge-91.0-dev
+FROM sitespeedio/webbrowsers:chrome-91.0-firefox-89.0-edge-91.0-dev
 
 ENV SITESPEED_IO_BROWSERTIME__XVFB true
 ENV SITESPEED_IO_BROWSERTIME__DOCKER true
diff --git a/Dockerfile-slim b/Dockerfile-slim
index efd34a419..6c69bcf04 100644
--- a/Dockerfile-slim
+++ b/Dockerfile-slim
@@ -6,7 +6,7 @@ ENV SITESPEED_IO_BROWSERTIME__BROWSER firefox
 ENV SITESPEED_IO_BROWSERTIME__VISUAL_METRICS false
 ENV SITESPEED_IO_BROWSERTIME__HEADLESS true
 
-ENV FIREFOX_VERSION 90.0
+ENV FIREFOX_VERSION 89.0
 
 ENV PATH="/usr/local/bin:${PATH}"