diff --git a/stk500v2/stk500v2.cppproj b/stk500v2/stk500v2.cppproj
index d870eb8..0fd7e08 100644
--- a/stk500v2/stk500v2.cppproj
+++ b/stk500v2/stk500v2.cppproj
@@ -15,7 +15,7 @@
     <AssemblyName>stk500v2</AssemblyName>
     <Name>stk500v2</Name>
     <RootNamespace>stk500v2</RootNamespace>
-    <ToolchainFlavour>avr-g++-9.1.0</ToolchainFlavour>
+    <ToolchainFlavour>avr-g++-10.0.1</ToolchainFlavour>
     <KeepTimersRunning>true</KeepTimersRunning>
     <OverrideVtor>false</OverrideVtor>
     <CacheFlash>true</CacheFlash>
@@ -141,7 +141,7 @@
         <avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
         <avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
         <avrgcccpp.compiler.warnings.Pedantic>True</avrgcccpp.compiler.warnings.Pedantic>
-        <avrgcccpp.compiler.miscellaneous.OtherFlags>-fno-threadsafe-statics -Wextra -std=c++17</avrgcccpp.compiler.miscellaneous.OtherFlags>
+        <avrgcccpp.compiler.miscellaneous.OtherFlags>-fno-threadsafe-statics -Wextra -std=c++20</avrgcccpp.compiler.miscellaneous.OtherFlags>
         <avrgcccpp.linker.general.NoStartupOrDefaultLibs>True</avrgcccpp.linker.general.NoStartupOrDefaultLibs>
         <avrgcccpp.linker.libraries.Libraries>
           <ListValues>
@@ -206,7 +206,7 @@
         <avrgcccpp.compiler.optimization.DebugLevel>Maximum (-g3)</avrgcccpp.compiler.optimization.DebugLevel>
         <avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
         <avrgcccpp.compiler.warnings.Pedantic>True</avrgcccpp.compiler.warnings.Pedantic>
-        <avrgcccpp.compiler.miscellaneous.OtherFlags>-fno-threadsafe-statics -Wextra -std=c++17</avrgcccpp.compiler.miscellaneous.OtherFlags>
+        <avrgcccpp.compiler.miscellaneous.OtherFlags>-fno-threadsafe-statics -Wextra -std=c++20</avrgcccpp.compiler.miscellaneous.OtherFlags>
         <avrgcccpp.linker.general.NoStartupOrDefaultLibs>True</avrgcccpp.linker.general.NoStartupOrDefaultLibs>
         <avrgcccpp.linker.libraries.Libraries>
           <ListValues>