diff --git a/MimeKit/MimeKit.csproj b/MimeKit/MimeKit.csproj
index c444ab1531..862d6170fd 100644
--- a/MimeKit/MimeKit.csproj
+++ b/MimeKit/MimeKit.csproj
@@ -82,7 +82,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="BouncyCastle.Cryptography" Version="2.2.1" />
+    <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/nuget/MimeKit.nuspec b/nuget/MimeKit.nuspec
index 8880db5410..d27e34972b 100644
--- a/nuget/MimeKit.nuspec
+++ b/nuget/MimeKit.nuspec
@@ -59,31 +59,31 @@
         <dependency id="System.Runtime.CompilerServices.Unsafe" version="6.0.0" />
         <dependency id="System.Buffers" version="4.5.1" />
         <dependency id="System.Memory" version="4.5.5" />
-        <dependency id="BouncyCastle.Cryptography" version="2.2.1" />
+        <dependency id="BouncyCastle.Cryptography" version="2.3.0" />
       </group>
       <group targetFramework="net47">
         <dependency id="System.Runtime.CompilerServices.Unsafe" version="6.0.0" />
         <dependency id="System.Buffers" version="4.5.1" />
         <dependency id="System.Memory" version="4.5.5" />
-        <dependency id="BouncyCastle.Cryptography" version="2.2.1" />
+        <dependency id="BouncyCastle.Cryptography" version="2.3.0" />
       </group>
       <group targetFramework="net48">
         <dependency id="System.Runtime.CompilerServices.Unsafe" version="6.0.0" />
         <dependency id="System.Buffers" version="4.5.1" />
         <dependency id="System.Memory" version="4.5.5" />
-        <dependency id="BouncyCastle.Cryptography" version="2.2.1" />
+        <dependency id="BouncyCastle.Cryptography" version="2.3.0" />
       </group>
       <group targetFramework="net6.0">
         <dependency id="System.Runtime.CompilerServices.Unsafe" version="6.0.0" />
         <dependency id="System.Security.Cryptography.Pkcs" version="8.0.0" />
         <dependency id="System.Text.Encoding.CodePages" version="8.0.0" />
-        <dependency id="BouncyCastle.Cryptography" version="2.2.1" />
+        <dependency id="BouncyCastle.Cryptography" version="2.3.0" />
       </group>
       <group targetFramework="net8.0">
         <dependency id="System.Runtime.CompilerServices.Unsafe" version="6.0.0" />
         <dependency id="System.Security.Cryptography.Pkcs" version="8.0.0" />
         <dependency id="System.Text.Encoding.CodePages" version="8.0.0" />
-        <dependency id="BouncyCastle.Cryptography" version="2.2.1" />
+        <dependency id="BouncyCastle.Cryptography" version="2.3.0" />
       </group>
       <group targetFramework="netstandard2.0">
         <dependency id="System.Runtime.CompilerServices.Unsafe" version="6.0.0" />
@@ -92,7 +92,7 @@
         <dependency id="System.Data.DataSetExtensions" version="4.5.0" />
         <dependency id="System.Buffers" version="4.5.1" />
         <dependency id="System.Memory" version="4.5.5" />
-        <dependency id="BouncyCastle.Cryptography" version="2.2.1" />
+        <dependency id="BouncyCastle.Cryptography" version="2.3.0" />
       </group>
       <group targetFramework="netstandard2.1">
         <dependency id="System.Runtime.CompilerServices.Unsafe" version="6.0.0" />
@@ -100,7 +100,7 @@
         <dependency id="System.Text.Encoding.CodePages" version="8.0.0" />
         <dependency id="System.Buffers" version="4.5.1" />
         <dependency id="System.Memory" version="4.5.5" />
-        <dependency id="BouncyCastle.Cryptography" version="2.2.1" />
+        <dependency id="BouncyCastle.Cryptography" version="2.3.0" />
       </group>
     </dependencies>
   </metadata>