diff --git a/.github/workflows/qodana_code_quality.yml b/.github/workflows/qodana_code_quality.yml
deleted file mode 100644
index 8dd7308..0000000
--- a/.github/workflows/qodana_code_quality.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-name: Qodana
-on:
-  workflow_dispatch:
-  pull_request:
-  push:
-    branches:
-      - master
-
-jobs:
-  qodana:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-      - name: 'Qodana Scan'
-        uses: JetBrains/qodana-action@v2023.2
-        env:
-          QODANA_TOKEN: ${{ secrets.QODANA_TOKEN }}
\ No newline at end of file
diff --git a/Linguini.Bundle/FluentBundle.cs b/Linguini.Bundle/FluentBundle.cs
index 1e8d75e..ad1398f 100644
--- a/Linguini.Bundle/FluentBundle.cs
+++ b/Linguini.Bundle/FluentBundle.cs
@@ -1,5 +1,4 @@
-#nullable enable
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
@@ -258,10 +257,6 @@ private bool TryInsert(string funcName, ExternalFunction fluentFunction,
         {
             switch (behavior)
             {
-#if NET5_0_OR_GREATER
-                case InsertBehavior.None:
-                    return _funcList.TryAdd(funcName, fluentFunction);
-#else
                 case InsertBehavior.None:
                     if (!_funcList.ContainsKey(funcName))
                     {
@@ -270,7 +265,6 @@ private bool TryInsert(string funcName, ExternalFunction fluentFunction,
                     }
 
                     return false;
-#endif
                 case InsertBehavior.OverwriteExisting:
                     _funcList[funcName] = fluentFunction;
                     break;
diff --git a/Linguini.Shared/Util/ZeroCopyUtil.cs b/Linguini.Shared/Util/ZeroCopyUtil.cs
index 5b12732..10b8bc8 100644
--- a/Linguini.Shared/Util/ZeroCopyUtil.cs
+++ b/Linguini.Shared/Util/ZeroCopyUtil.cs
@@ -1,6 +1,4 @@
 using System;
-using System.Diagnostics;
-using System.Runtime.InteropServices;
 
 namespace Linguini.Shared.Util
 {
@@ -87,7 +85,7 @@ public static bool IsOneOf(this char c, char c1, char c2, char c3, char c4)
             return c == c1 || c == c2 || c == c3 || c == c4;
         }
 
-#if !NET5_0_OR_GREATER 
+#if NETSTANDARD2_1
         // Polyfill for netstandard 2.1 until dotnet backports MemoryExtension
         public static ReadOnlyMemory<char> TrimEndPolyFill(this ReadOnlyMemory<char> memory)
             => memory.Slice(0, FindLastWhitespace(memory.Span));
diff --git a/Linguini.Syntax/Parser/LinguiniParser.cs b/Linguini.Syntax/Parser/LinguiniParser.cs
index 99be045..7c7093e 100644
--- a/Linguini.Syntax/Parser/LinguiniParser.cs
+++ b/Linguini.Syntax/Parser/LinguiniParser.cs
@@ -1,5 +1,4 @@
-#nullable enable
-
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
@@ -21,7 +20,7 @@ public class LinguiniParser
     {
         private readonly ZeroCopyReader _reader;
         private readonly bool _enableExperimental;
-        private const string CR = "\n";
+        private const string Cr = "\n";
 
         /// <summary>
         /// Set input to <c>string</c>
@@ -609,11 +608,11 @@ private bool TryGetPattern(out Pattern? pattern, out ParseError? error)
                             ReadOnlyMemory<char> value;
                             if (textLiteral.MissingEol && textLiteral.Start == textLiteral.End)
                             {
-                                value = CR.AsMemory();
+                                value = Cr.AsMemory();
                             }
                             else if (textLiteral.MissingEol && textLiteral.Start != textLiteral.End)
                             {
-                                var str = _reader.ReadSlice(start, end) + CR;
+                                var str = _reader.ReadSlice(start, end) + Cr;
                                 value = str.AsMemory();
                             }
                             else
@@ -623,10 +622,10 @@ private bool TryGetPattern(out Pattern? pattern, out ParseError? error)
 
                             if (lastNonBlank == i)
                             {
-#if NET5_0_OR_GREATER
-                                value = value.TrimEnd();
-#else
+#if NETSTANDARD2_1
                                 value = value.TrimEndPolyFill();
+#else
+                                value = value.TrimEnd();
 #endif
                             }
 
@@ -772,7 +771,7 @@ private List<Attribute> GetAttributes()
 
         private bool TryGetAttribute([NotNullWhen(true)] out Attribute? attr)
         {
-            if (!TryGetIdentifier(out var id, out var err))
+            if (!TryGetIdentifier(out var id, out _))
             {
                 attr = default!;
                 return false;
@@ -780,13 +779,13 @@ private bool TryGetAttribute([NotNullWhen(true)] out Attribute? attr)
 
             _reader.SkipBlankInline();
 
-            if (!TryExpectChar('=', out err))
+            if (!TryExpectChar('=', out _))
             {
                 attr = default!;
                 return false;
             }
 
-            if (TryGetPattern(out var pattern, out err) && pattern != null)
+            if (TryGetPattern(out var pattern, out _) && pattern != null)
             {
                 attr = new Attribute(id, pattern);
                 return true;