diff --git a/appveyor.yml b/appveyor.yml
index d8ba90a7..8560a668 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 5.1.0-{build}
+version: 5.1.1-{build}
 image: Visual Studio 2017
 branches:
   only:
diff --git a/doc/doxygen/Doxyfile b/doc/doxygen/Doxyfile
index b8417964..160cd28b 100644
--- a/doc/doxygen/Doxyfile
+++ b/doc/doxygen/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = Pkcs11Interop
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 5.1.0
+PROJECT_NUMBER         = 5.1.1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/src/Pkcs11Interop/CHANGELOG.txt b/src/Pkcs11Interop/CHANGELOG.txt
index 13b6a3b2..538f3f70 100644
--- a/src/Pkcs11Interop/CHANGELOG.txt
+++ b/src/Pkcs11Interop/CHANGELOG.txt
@@ -1,3 +1,6 @@
+Pkcs11Interop 5.1.1 (2020-08-02)
+ - #164 - Fixed processing of unextractable array attributes
+
 Pkcs11Interop 5.1.0 (2020-03-12)
  - Support alternative "empty" value of CK_DATE
  - #143 - Use LoadLibraryEx instead of LoadLibrary
diff --git a/src/Pkcs11Interop/Pkcs11Interop.csproj b/src/Pkcs11Interop/Pkcs11Interop.csproj
index 07785120..da76dea0 100644
--- a/src/Pkcs11Interop/Pkcs11Interop.csproj
+++ b/src/Pkcs11Interop/Pkcs11Interop.csproj
@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <Version>5.1.0</Version>
+    <Version>5.1.1</Version>
     <Authors>Jaroslav Imrich</Authors>
     <Description>Managed .NET wrapper for unmanaged PKCS#11 libraries</Description>
     <Copyright>Copyright (c) 2012-2020 The Pkcs11Interop Project</Copyright>