diff --git a/TesseractOCR.Net45Tests/x64/leptonica-1.85.0.dll b/TesseractOCR.Net45Tests/x64/leptonica-1.85.0.dll
index 6984770..09992eb 100644
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diff --git a/TesseractOCR.Net45Tests/x64/tesseract54.dll b/TesseractOCR.Net45Tests/x64/tesseract54.dll
index f826994..dc2e88b 100644
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diff --git a/TesseractOCR.Net45Tests/x86/leptonica-1.85.0.dll b/TesseractOCR.Net45Tests/x86/leptonica-1.85.0.dll
index 11cb7ca..1bdcebd 100644
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diff --git a/TesseractOCR.Net45Tests/x86/tesseract54.dll b/TesseractOCR.Net45Tests/x86/tesseract54.dll
index f7345f8..3ef0191 100644
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diff --git a/TesseractOCR.NetCore31Tests/x64/leptonica-1.85.0.dll b/TesseractOCR.NetCore31Tests/x64/leptonica-1.85.0.dll
index 6984770..09992eb 100644
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diff --git a/TesseractOCR.NetCore31Tests/x64/tesseract54.dll b/TesseractOCR.NetCore31Tests/x64/tesseract54.dll
index f826994..dc2e88b 100644
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diff --git a/TesseractOCR.NetCore31Tests/x86/leptonica-1.85.0.dll b/TesseractOCR.NetCore31Tests/x86/leptonica-1.85.0.dll
index 11cb7ca..1bdcebd 100644
Binary files a/TesseractOCR.NetCore31Tests/x86/leptonica-1.85.0.dll and b/TesseractOCR.NetCore31Tests/x86/leptonica-1.85.0.dll differ
diff --git a/TesseractOCR.NetCore31Tests/x86/tesseract54.dll b/TesseractOCR.NetCore31Tests/x86/tesseract54.dll
index f7345f8..3ef0191 100644
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diff --git a/TesseractOCR/InteropDotNet/LibraryLoader.cs b/TesseractOCR/InteropDotNet/LibraryLoader.cs
index 853a0e3..c4cd957 100644
--- a/TesseractOCR/InteropDotNet/LibraryLoader.cs
+++ b/TesseractOCR/InteropDotNet/LibraryLoader.cs
@@ -115,8 +115,8 @@ public IntPtr LoadLibrary(string fileName, string platformName = null)
             fileName = FixUpLibraryName(fileName);
             lock (_syncLock)
             {
-                if (_loadedAssemblies.ContainsKey(fileName)) 
-                    return _loadedAssemblies[fileName];
+                if (_loadedAssemblies.TryGetValue(fileName, out var library)) 
+                    return library;
                 
                 if (platformName == null)
                     platformName = SystemManager.GetPlatformName();
diff --git a/TesseractOCR/TesseractOCR.csproj b/TesseractOCR/TesseractOCR.csproj
index 383d1e8..97d03d3 100644
--- a/TesseractOCR/TesseractOCR.csproj
+++ b/TesseractOCR/TesseractOCR.csproj
@@ -4,12 +4,12 @@
 		<PackageId>TesseractOCR</PackageId>
 		<Authors>Charles Weld &amp; Kees van Spelde</Authors>
 		<Product>Tesseract</Product>
-		<Description>Tesseract 5.3.2 adds a new neural net (LSTM) based OCR engine which is focused on line recognition, but also still supports the legacy Tesseract OCR engine of Tesseract 3 
+		<Description>Tesseract 5.4.1 adds a new neural net (LSTM) based OCR engine which is focused on line recognition, but also still supports the legacy Tesseract OCR engine of Tesseract 3 
 which works by recognizing character patterns. Compatibility with Tesseract 3 is enabled by using the Legacy OCR Engine mode (--oem 0). It also needs traineddata files 
 which support the legacy engine, for example those from the tessdata repository.</Description>
 		<Copyright>Copyright 2012-2021 Charles Weld - Copyright 2021-2023 Kees van Spelde</Copyright>
-		<PackageReleaseNotes>- Updated to Tesseract 5.3.2
-- Updated to Leptonica 1.83.1
+		<PackageReleaseNotes>- Updated to Tesseract 5.4.1
+- Updated to Leptonica 1.85.0
 - Updated nuget packages</PackageReleaseNotes>
 		<PackageProjectUrl>https://github.com/Sicos1977/TesseractOCR</PackageProjectUrl>
 		<RepositoryUrl>https://github.com/Sicos1977/TesseractOCR</RepositoryUrl>
@@ -18,10 +18,10 @@ which support the legacy engine, for example those from the tessdata repository.
 		<SignAssembly>false</SignAssembly>
 		<TargetFrameworks>netstandard21;net461;net48;net5.0;net6.0;net8.0</TargetFrameworks>
 		<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
-		<FileVersion>5.3.6.0</FileVersion>
-		<AssemblyVersion>5.3.6.0</AssemblyVersion>
+		<FileVersion>5.4.1.0</FileVersion>
+		<AssemblyVersion>5.4.1.0</AssemblyVersion>
 		<PackageRequireLicenseAcceptance>False</PackageRequireLicenseAcceptance>
-		<Version>5.3.6-preview-6</Version>
+		<Version>5.4.1</Version>
 		<PackageIcon>ocr.png</PackageIcon>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
diff --git a/TesseractOCR/x64/leptonica-1.85.0.dll b/TesseractOCR/x64/leptonica-1.85.0.dll
index 6984770..09992eb 100644
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index f826994..dc2e88b 100644
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diff --git a/TesseractOCR/x86/leptonica-1.85.0.dll b/TesseractOCR/x86/leptonica-1.85.0.dll
index 11cb7ca..1bdcebd 100644
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diff --git a/TesseractOCR/x86/tesseract54.dll b/TesseractOCR/x86/tesseract54.dll
index f7345f8..3ef0191 100644
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