diff --git a/contrib/thrift-maven-plugin/pom.xml b/contrib/thrift-maven-plugin/pom.xml
index 7f25538..863a6a9 100644
--- a/contrib/thrift-maven-plugin/pom.xml
+++ b/contrib/thrift-maven-plugin/pom.xml
@@ -94,7 +94,7 @@
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
-      <version>32.0.0-jre</version>
+        <version>32.0.1</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
diff --git a/lib/rb/thrift.gemspec b/lib/rb/thrift.gemspec
index f6ac77c..5de4408 100644
--- a/lib/rb/thrift.gemspec
+++ b/lib/rb/thrift.gemspec
@@ -31,7 +31,7 @@
   s.add_development_dependency 'pry',                '~> 0.11.3'
   s.add_development_dependency 'pry-byebug',         '~> 3.6'
   s.add_development_dependency 'pry-stack_explorer', '~> 0.4.9.2'
-  s.add_development_dependency 'rack',               '=  2.0.8'
+  s.add_development_dependency 'rack',               '=  2.2.6.4'
   s.add_development_dependency 'rack-test',          '~> 0.8.3'
   s.add_development_dependency 'rake',               '~> 12.3'
   s.add_development_dependency 'rspec',              '~> 3.7'
diff --git a/test/dart/test_client/pubspec.yaml b/test/dart/test_client/pubspec.yaml
index c34d693..45a7a4e 100644
--- a/test/dart/test_client/pubspec.yaml
+++ b/test/dart/test_client/pubspec.yaml
@@ -26,7 +26,7 @@
 
 dependencies:
   args: ">=0.13.0 <2.0.0"
-  http: ^0.11.0
+  http: ^0.13.3
   thrift:
     path: ../../../lib/dart
   thrift_test: