diff --git a/build.sbt b/build.sbt
index dbe125a..26d8462 100644
--- a/build.sbt
+++ b/build.sbt
@@ -38,8 +38,8 @@ lazy val runtime = (project in file("runtime")).settings(
     "com.thesamet.scalapb" %% "scalapb-runtime" % scalapb.compiler.Version.scalapbVersion,
     "com.thesamet.scalapb" %% "scalapb-json4s"  % "0.12.1",
     "org.json4s"           %% "json4s-native"   % "4.0.7",
-    "org.specs2"           %% "specs2-core"     % "4.20.5" % Test,
-    "org.specs2"           %% "specs2-mock"     % "4.20.5" % Test
+    "org.specs2"           %% "specs2-core"     % "4.20.6" % Test,
+    "org.specs2"           %% "specs2-mock"     % "4.20.6" % Test
   ),
   // compile protobuf messages for unit tests
   Project.inConfig(Test)(sbtprotoc.ProtocPlugin.protobufConfigSettings),
diff --git a/codegen/src/sbt-test/generator/e2e/build.sbt b/codegen/src/sbt-test/generator/e2e/build.sbt
index 76c075c..7c92920 100644
--- a/codegen/src/sbt-test/generator/e2e/build.sbt
+++ b/codegen/src/sbt-test/generator/e2e/build.sbt
@@ -9,4 +9,4 @@ scalacOptions ++= Seq(
   "-Xfatal-warnings"
 )
 
-libraryDependencies += "org.specs2" %% "specs2-core" % "4.20.5" % Test
+libraryDependencies += "org.specs2" %% "specs2-core" % "4.20.6" % Test