diff --git a/ruby_event_store-browser/Gemfile b/ruby_event_store-browser/Gemfile
index aefa9beab3..1a5ee2e610 100644
--- a/ruby_event_store-browser/Gemfile
+++ b/ruby_event_store-browser/Gemfile
@@ -9,7 +9,7 @@ gem "ruby_event_store", path: ".."
 
 gem "rack-test"
 gem "capybara", "~> 3.35"
-gem "json-schema"
+gem "json-schema", github: "mostlyobvious/json-schema"
 gem "rack", "~> 3.0"
 gem "webrick"
 gem "cuprite"
diff --git a/ruby_event_store-browser/Gemfile.lock b/ruby_event_store-browser/Gemfile.lock
index 5f8c0b1857..5cb20c165d 100644
--- a/ruby_event_store-browser/Gemfile.lock
+++ b/ruby_event_store-browser/Gemfile.lock
@@ -1,3 +1,10 @@
+GIT
+  remote: https://github.com/mostlyobvious/json-schema.git
+  revision: 3dd3e77d468538a114d212187bed912dcbff96f4
+  specs:
+    json-schema (4.1.1)
+      addressable (>= 2.8)
+
 PATH
   remote: ..
   specs:
@@ -41,8 +48,6 @@ GEM
       concurrent-ruby (~> 1.1)
       webrick (~> 1.7)
       websocket-driver (>= 0.6, < 0.8)
-    json-schema (4.1.1)
-      addressable (>= 2.8)
     matrix (0.4.2)
     mini_mime (1.1.5)
     mini_portile2 (2.8.5)
@@ -116,7 +121,7 @@ PLATFORMS
 DEPENDENCIES
   capybara (~> 3.35)
   cuprite
-  json-schema
+  json-schema!
   mutant (= 0.11.22)
   mutant-license!
   mutant-minitest (= 0.11.22)
diff --git a/ruby_event_store-browser/Gemfile.rack_2_0 b/ruby_event_store-browser/Gemfile.rack_2_0
index e8fb4f188d..db1278f748 100644
--- a/ruby_event_store-browser/Gemfile.rack_2_0
+++ b/ruby_event_store-browser/Gemfile.rack_2_0
@@ -7,7 +7,7 @@ gem "ruby_event_store", path: ".."
 
 gem "rack-test"
 gem "capybara", "~> 3.35"
-gem "json-schema"
+gem "json-schema", github: "mostlyobvious/json-schema"
 gem "rack", "~> 2.0"
 gem "webrick"
 gem "cuprite"
diff --git a/ruby_event_store-browser/Gemfile.rack_2_0.lock b/ruby_event_store-browser/Gemfile.rack_2_0.lock
index f5c298aa3a..a7e4df71ca 100644
--- a/ruby_event_store-browser/Gemfile.rack_2_0.lock
+++ b/ruby_event_store-browser/Gemfile.rack_2_0.lock
@@ -1,3 +1,10 @@
+GIT
+  remote: https://github.com/mostlyobvious/json-schema.git
+  revision: 3dd3e77d468538a114d212187bed912dcbff96f4
+  specs:
+    json-schema (4.1.1)
+      addressable (>= 2.8)
+
 PATH
   remote: ..
   specs:
@@ -41,8 +48,6 @@ GEM
       concurrent-ruby (~> 1.1)
       webrick (~> 1.7)
       websocket-driver (>= 0.6, < 0.8)
-    json-schema (4.1.1)
-      addressable (>= 2.8)
     matrix (0.4.2)
     mini_mime (1.1.5)
     mini_portile2 (2.8.5)
@@ -113,7 +118,7 @@ PLATFORMS
 DEPENDENCIES
   capybara (~> 3.35)
   cuprite
-  json-schema
+  json-schema!
   mutant (= 0.11.22)
   mutant-license!
   mutant-minitest (= 0.11.22)