diff --git a/.crystal-version b/.crystal-version
index 8b95abd..f176c94 100644
--- a/.crystal-version
+++ b/.crystal-version
@@ -1 +1 @@
-0.24.2
+0.31.1
diff --git a/README.md b/README.md
index 7ea4f92..7264243 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ Create a JWT that can be sent to the client side for your end user to connect to
 get "/api/bifrost-token" do
   authenticate_user!
   payload = { channels: ["user:#{current_user.id}", "global"] }
-  jwt = JWT.encode(payload, ENV["JWT_SECRET"], "HS512")
+  jwt = JWT.encode(payload, ENV["JWT_SECRET"], JWT::Algorithm::HS512)
   { token: jwt }.to_json
 end
 ```
@@ -114,7 +114,7 @@ data = {
   },
   exp: Time.zone.now.to_i + 1.hour
 }
-jwt = JWT.encode(data, ENV["JWT_SECRET"], "HS512")
+jwt = JWT.encode(data, ENV["JWT_SECRET"], JWT::Algorithm::HS512)
 url = ENV.fetch("BIFROST_URL")
 url += "/broadcast"
 
diff --git a/shard.lock b/shard.lock
index f96d397..6908bf2 100644
--- a/shard.lock
+++ b/shard.lock
@@ -2,25 +2,33 @@ version: 1.0
 shards:
   dotenv:
     github: gdotdesign/cr-dotenv
-    version: 0.1.0
+    version: 0.3.1
+
+  exception_page:
+    github: crystal-loot/exception_page
+    version: 0.1.2
 
   jwt:
     github: crystal-community/jwt
-    version: 0.2.2
+    version: 1.1.1
 
   kemal:
     github: kemalcr/kemal
-    version: 0.22.0
+    version: 0.26.0
 
   kilt:
     github: jeromegn/kilt
     version: 0.4.0
 
+  openssl_ext:
+    github: stakach/openssl_ext
+    version: 1.0.0
+
   radix:
     github: luislavena/radix
-    version: 0.3.8
+    version: 0.3.9
 
   spec-kemal:
     github: kemalcr/spec-kemal
-    commit: 93ab608228ea6619d15555d1c77a3bcff29f1dba
+    version: 0.5.0
 
diff --git a/shard.yml b/shard.yml
index 86042a2..b073ef5 100644
--- a/shard.yml
+++ b/shard.yml
@@ -11,15 +11,13 @@ targets:
 dependencies:
   spec-kemal:
     github: kemalcr/spec-kemal
-    branch: master
   kemal:
     github: kemalcr/kemal
-    version: ~> 0.22.0
   jwt:
     github: crystal-community/jwt
   dotenv:
     github: gdotdesign/cr-dotenv
 
-crystal: 0.24.2
+crystal: 0.31.1
 
 license: MIT
diff --git a/spec/bifrost_spec.cr b/spec/bifrost_spec.cr
index 4aad7d7..64533b3 100644
--- a/spec/bifrost_spec.cr
+++ b/spec/bifrost_spec.cr
@@ -23,9 +23,9 @@ describe Bifrost do
     context "invalid JWT" do
       it "returns bad request" do
         payload = {
-          exp: Time.now.epoch + 3600, # 1 hour
+          exp: Time.local.to_unix + 3600, # 1 hour
         }
-        jwt = JWT.encode(payload, "bad-secret-key", "HS512")
+        jwt = JWT.encode(payload, "bad-secret-key", JWT::Algorithm::HS512)
         post "/broadcast", headers: HTTP::Headers{"Content-Type" => "application/json"}, body: {token: jwt}.to_json
 
         response.status_code.should eq 400
@@ -37,9 +37,9 @@ describe Bifrost do
     context "expired JWT" do
       it "returns bad request" do
         payload = {
-          exp: Time.now.epoch - 10,
+          exp: Time.local.to_unix - 10,
         }
-        jwt = JWT.encode(payload, ENV["JWT_SECRET"], "HS512")
+        jwt = JWT.encode(payload, ENV["JWT_SECRET"], JWT::Algorithm::HS512)
         post "/broadcast", headers: HTTP::Headers{"Content-Type" => "application/json"}, body: {token: jwt}.to_json
 
         response.status_code.should eq 400
@@ -51,11 +51,11 @@ describe Bifrost do
     context "valid JWT" do
       it "returns success" do
         payload = {
-          exp:     Time.now.epoch + 3600,
+          exp:     Time.local.to_unix + 3600,
           channel: "user:12",
           message: {test: "test"}.to_json,
         }
-        jwt = JWT.encode(payload, ENV["JWT_SECRET"], "HS512")
+        jwt = JWT.encode(payload, ENV["JWT_SECRET"], JWT::Algorithm::HS512)
         post "/broadcast", headers: HTTP::Headers{"Content-Type" => "application/json"}, body: {token: jwt}.to_json
 
         response.status_code.should eq 200
diff --git a/src/bifrost.cr b/src/bifrost.cr
index ca34b90..b249957 100644
--- a/src/bifrost.cr
+++ b/src/bifrost.cr
@@ -22,7 +22,7 @@ module Bifrost
     if Kemal.config.env == "development"
       env.response.content_type = "text/html"
       allowed_channels = {channels: ["user:1"]}
-      test_token = JWT.encode(allowed_channels, ENV["JWT_SECRET"], "HS512")
+      test_token = JWT.encode(allowed_channels, ENV["JWT_SECRET"], JWT::Algorithm::HS512)
       render "src/views/test.ecr"
     else
       render_404
@@ -58,12 +58,12 @@ module Bifrost
       token = env.params.json["token"].as(String)
       payload = self.decode_jwt(token)
 
-      channel = payload["channel"].as(String)
+      channel = payload["channel"].as_s
       deliveries = 0
 
       if SOCKETS.has_key?(channel)
         SOCKETS[channel].each do |socket|
-          socket.send(payload["message"].as(Hash).to_json)
+          socket.send(payload["message"].as_h.to_json)
           deliveries += 1
         end
       end
@@ -92,8 +92,8 @@ module Bifrost
 
         begin
           payload = self.decode_jwt(token)
-          payload["channels"].as(Array).each do |channel|
-            channel = channel.as(String)
+          payload["channels"].as_a.each do |channel|
+            channel = channel.as_s
             if SOCKETS.has_key?(channel)
               SOCKETS[channel] << socket
             else
@@ -149,7 +149,7 @@ module Bifrost
   end
 
   def self.decode_jwt(token : String)
-    payload, header = JWT.decode(token, ENV["JWT_SECRET"], "HS512")
+    payload, header = JWT.decode(token, ENV["JWT_SECRET"], JWT::Algorithm::HS512)
     payload
   end
 end