diff --git a/Gemfile b/Gemfile
index cfa9e67..633b416 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,7 +20,7 @@ gem "tailwindcss-rails"
 gem "jbuilder"
 
 # Fast JSON serialization [https://github.com/okuramasafumi/alba]
-gem "alba", "~> 3.5"
+gem "alba", "~> 3.9"
 
 # Authentication
 gem "devise", "~> 4.9"
diff --git a/Gemfile.lock b/Gemfile.lock
index 970a047..b721ef9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,7 +76,7 @@ GEM
       rails (>= 6.0)
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
-    alba (3.9.0)
+    alba (3.9.1)
     ast (2.4.3)
     attr_extras (7.1.0)
     base64 (0.3.0)
@@ -614,7 +614,7 @@ PLATFORMS
 
 DEPENDENCIES
   acts_as_tenant (~> 1.0)
-  alba (~> 3.5)
+  alba (~> 3.9)
   attr_extras (~> 7.1)
   bootsnap
   brakeman