diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index 8bd3680..0dcb015 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -21,7 +21,7 @@ RUN shards install --production
 
 FROM crystallang/crystal:1.3-alpine as builder
 ARG BUILD_ENV
-WORKDIR /app/backend
+WORKDIR /app
 COPY --from=deps /app/shard.yml /app/shard.lock ./
 COPY --from=deps /app/lib ./lib
 COPY ./LICENSE ./LICENSE
@@ -36,7 +36,7 @@ RUN if [ "${BUILD_ENV}" = "development" ]; then \
 FROM alpine as runner
 WORKDIR /app
 RUN adduser -S backend -u 1001
-COPY --from=builder /app/backend/bin ./bin
+COPY --from=builder /app/bin ./bin
 COPY ./db ./db
 USER backend
 EXPOSE 80
diff --git a/docker/backend/shard.lock b/docker/backend/shard.lock
index 731cd9f..0cefeae 100644
--- a/docker/backend/shard.lock
+++ b/docker/backend/shard.lock
@@ -2,7 +2,7 @@ version: 2.0
 shards:
   bindata:
     git: https://github.com/spider-gazelle/bindata.git
-    version: 1.9.1
+    version: 1.10.0
 
   commander:
     git: https://github.com/mrrooijen/commander.git
@@ -18,7 +18,7 @@ shards:
 
   email:
     git: https://github.com/arcage/crystal-email.git
-    version: 0.6.3
+    version: 0.6.4
 
   env_config:
     git: https://github.com/repomaa/env_config.cr.git
diff --git a/docker/backend/shard.yml b/docker/backend/shard.yml
index 60f882e..a37e96b 100644
--- a/docker/backend/shard.yml
+++ b/docker/backend/shard.yml
@@ -36,8 +36,6 @@ dependencies:
     github: amberframework/quartz-mailer
   kilt:
     github: jeromegn/kilt
-  email:
-    github: arcage/crystal-email
   router:
     github: tbrand/router.cr
   html-minifier:
diff --git a/docker/backend/src/backend/api/context.cr b/docker/backend/src/backend/api/context.cr
index 61cedef..caad554 100644
--- a/docker/backend/src/backend/api/context.cr
+++ b/docker/backend/src/backend/api/context.cr
@@ -16,12 +16,17 @@
 
 require "http/request"
 require "graphql"
-require "granite"
 
 module Backend
   module Api
     # GraphQL request context class
     class Context < GraphQL::Context
+      # Request object
+      getter request
+
+      # Development mode
+      getter development : Bool
+
       # Authenticated user
       getter user : Db::User?
 
@@ -34,10 +39,10 @@ module Backend
       # User's external object
       getter external : (Db::Teacher | Db::Student)?
 
-      def initialize(request : HTTP::Request, max_complexity : Int32? = nil)
-        super(max_complexity)
+      def initialize(@request : HTTP::Request, @development : Bool, *rest)
+        super(*rest)
 
-        token = request.headers["Authorization"]?
+        token = @request.headers["Authorization"]?
         if token && token[..Auth::BEARER.size - 1] == Auth::BEARER
           payload = Auth.decode_jwt?(token[Auth::BEARER.size..])
           return unless payload
diff --git a/docker/backend/src/backend/api/webserver.cr b/docker/backend/src/backend/api/webserver.cr
index 152e708..441b1fc 100644
--- a/docker/backend/src/backend/api/webserver.cr
+++ b/docker/backend/src/backend/api/webserver.cr
@@ -56,12 +56,21 @@ module Backend
           context.response.content_type = "application/json"
 
           data = GraphQLQueryData.from_json(context.request.body.not_nil!.gets.not_nil!)
+          development = {% if flag?(:development) %}
+                          context.request.query_params["development"]? == "true"
+                        {% else %}
+                          false
+                        {% end %}
+          {% if flag?(:development) %}
+            Log.notice { "Development request incoming" } if development
+          {% end %}
+
           context.response.print(
             Schema::SCHEMA.execute(
               data.query,
               data.variables,
               data.operation_name,
-              Context.new(context.request)
+              Context.new(context.request, development)
             )
           )
 
@@ -73,14 +82,12 @@ module Backend
       def run : Nil
         draw_routes
 
-        server = HTTP::Server.new(
-          [
-            HTTP::LogHandler.new,
-            HTTP::ErrorHandler.new,
-            HTTP::CompressHandler.new,
-            route_handler,
-          ]
-        )
+        server = HTTP::Server.new([
+          HTTP::LogHandler.new,
+          HTTP::ErrorHandler.new,
+          HTTP::CompressHandler.new,
+          route_handler,
+        ])
         server.bind_tcp("0.0.0.0", 80, true)
         server.listen
       end
diff --git a/docker/backend/src/backend/mailers.cr b/docker/backend/src/backend/mailers.cr
index 23ad33b..2c8c901 100644
--- a/docker/backend/src/backend/mailers.cr
+++ b/docker/backend/src/backend/mailers.cr
@@ -15,7 +15,6 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 require "quartz_mailer"
-require "email"
 require "kilt"
 
 require "./mailers/*"