diff --git a/Gemfile b/Gemfile
index bd7445d..40559a6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem "rails",                   "5.2.1"
 gem "pg",                      ">= 0.18", "< 2.0"
 
 # Gems used by project
-gem "autoprefixer-rails"
+gem "autoprefixer-rails",      "9.1.0"
 gem "aws-sdk-s3",                          require: false
 gem "bootstrap",               "~> 4.1.3"
 gem "devise",                  "~> 4.4.3"
diff --git a/Gemfile.lock b/Gemfile.lock
index 6eaade8..eb8ebb9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,7 +45,7 @@ GEM
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
     arel (9.0.0)
-    autoprefixer-rails (9.1.1)
+    autoprefixer-rails (9.1.0)
       execjs
     aws-eventstream (1.0.1)
     aws-partitions (1.97.0)
@@ -257,7 +257,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  autoprefixer-rails
+  autoprefixer-rails (= 9.1.0)
   aws-sdk-s3
   bootsnap (>= 1.1.0)
   bootstrap (~> 4.1.3)