diff --git a/src/Libplanet.Crypto/Libplanet.Crypto.csproj b/src/Libplanet.Crypto/Libplanet.Crypto.csproj
index 1d0792fc03f..29343781cae 100644
--- a/src/Libplanet.Crypto/Libplanet.Crypto.csproj
+++ b/src/Libplanet.Crypto/Libplanet.Crypto.csproj
@@ -4,7 +4,7 @@
     <PackageReference Include="System.Collections.Immutable" Version="1.*" />
     <PackageReference Include="System.Text.Json" Version="6.0.*" />
     <PackageReference Include="Bencodex" Version="0.16.0" />
-    <PackageReference Include="BouncyCastle.Cryptography" Version="2.0.0" />
+    <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(SkipSonar)' != 'true'">
diff --git a/src/Libplanet/Libplanet.csproj b/src/Libplanet/Libplanet.csproj
index 65fa413ee7d..1c0bba6eac8 100644
--- a/src/Libplanet/Libplanet.csproj
+++ b/src/Libplanet/Libplanet.csproj
@@ -21,7 +21,7 @@ https://docs.libplanet.io/</Description>
     <PackageReference Include="System.Collections.Immutable" Version="1.*" />
     <PackageReference Include="System.Text.Json" Version="6.0.*" />
     <PackageReference Include="Bencodex" Version="0.16.0" />
-    <PackageReference Include="BouncyCastle.Cryptography" Version="2.0.0" />
+    <PackageReference Include="BouncyCastle.Cryptography" Version="2.3.1" />
     <PackageReference Include="Serilog" Version="2.8.0" />
     <PackageReference Include="Microsoft.Bcl.HashCode" Version="1.1.1" />
     <PackageReference Include="Norgerman.Cryptography.Scrypt" Version="2.0.1" />