diff --git a/examples/AndroidSample/packages.config b/examples/AndroidSample/packages.config
index b7bca62ac..cebd3851b 100644
--- a/examples/AndroidSample/packages.config
+++ b/examples/AndroidSample/packages.config
@@ -40,7 +40,7 @@
   <package id="System.Reflection.Extensions" version="4.3.0" targetFramework="monoandroid80" />
   <package id="System.Reflection.Primitives" version="4.3.0" targetFramework="monoandroid80" />
   <package id="System.Resources.ResourceManager" version="4.3.0" targetFramework="monoandroid80" />
-  <package id="System.Runtime" version="4.3.0" targetFramework="monoandroid80" />
+  <package id="System.Runtime" version="4.3.1" targetFramework="monoandroid80" />
   <package id="System.Runtime.CompilerServices.Unsafe" version="4.5.0" targetFramework="monoandroid80" />
   <package id="System.Runtime.Extensions" version="4.3.0" targetFramework="monoandroid80" />
   <package id="System.Runtime.Handles" version="4.3.0" targetFramework="monoandroid80" />
diff --git a/src/IO.Ably.Android/packages.config b/src/IO.Ably.Android/packages.config
index 740d5f2d7..d4f850f11 100644
--- a/src/IO.Ably.Android/packages.config
+++ b/src/IO.Ably.Android/packages.config
@@ -38,7 +38,7 @@
   <package id="System.Reflection.Extensions" version="4.3.0" targetFramework="monoandroid403" />
   <package id="System.Reflection.Primitives" version="4.3.0" targetFramework="monoandroid403" />
   <package id="System.Resources.ResourceManager" version="4.3.0" targetFramework="monoandroid403" />
-  <package id="System.Runtime" version="4.3.0" targetFramework="monoandroid403" />
+  <package id="System.Runtime" version="4.3.1" targetFramework="monoandroid403" />
   <package id="System.Runtime.CompilerServices.Unsafe" version="4.5.0" targetFramework="monoandroid71" />
   <package id="System.Runtime.Extensions" version="4.3.0" targetFramework="monoandroid403" />
   <package id="System.Runtime.Handles" version="4.3.0" targetFramework="monoandroid403" />
diff --git a/src/IO.Ably.Tests.DotNetCore20/IO.Ably.Tests.DotNetCore20.csproj b/src/IO.Ably.Tests.DotNetCore20/IO.Ably.Tests.DotNetCore20.csproj
index af142de46..053cfbbe5 100644
--- a/src/IO.Ably.Tests.DotNetCore20/IO.Ably.Tests.DotNetCore20.csproj
+++ b/src/IO.Ably.Tests.DotNetCore20/IO.Ably.Tests.DotNetCore20.csproj
@@ -32,7 +32,7 @@
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118" PrivateAssets="All" />
     <PackageReference Include="System.Data.SqlClient" Version="4.4.2" />
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
-    <PackageReference Include="System.Runtime" Version="4.3.0" />
+    <PackageReference Include="System.Runtime" Version="4.3.1" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.analyzers" Version="0.10.0" />
diff --git a/src/IO.Ably.iOS/packages.config b/src/IO.Ably.iOS/packages.config
index 765c8610b..e1edba7fd 100644
--- a/src/IO.Ably.iOS/packages.config
+++ b/src/IO.Ably.iOS/packages.config
@@ -38,7 +38,7 @@
   <package id="System.Reflection.Extensions" version="4.3.0" targetFramework="xamarinios10" />
   <package id="System.Reflection.Primitives" version="4.3.0" targetFramework="xamarinios10" />
   <package id="System.Resources.ResourceManager" version="4.3.0" targetFramework="xamarinios10" />
-  <package id="System.Runtime" version="4.3.0" targetFramework="xamarinios10" />
+  <package id="System.Runtime" version="4.3.1" targetFramework="xamarinios10" />
   <package id="System.Runtime.CompilerServices.Unsafe" version="4.5.0" targetFramework="xamarinios10" />
   <package id="System.Runtime.Extensions" version="4.3.0" targetFramework="xamarinios10" />
   <package id="System.Runtime.Handles" version="4.3.0" targetFramework="xamarinios10" />