diff --git a/ClosedXML/packages.config b/ClosedXML/packages.config
index 344713c..3f21e14 100644
--- a/ClosedXML/packages.config
+++ b/ClosedXML/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net452" />
-  <package id="ExcelNumberFormat" version="1.0.3" targetFramework="net452" />
-  <package id="FastMember.Signed" version="1.1.0" targetFramework="net452" />
-</packages>
\ No newline at end of file
+  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net40" />
+  <package id="ExcelNumberFormat" version="1.0.3" targetFramework="net40" />
+  <package id="FastMember.Signed" version="1.1.0" targetFramework="net40" />
+</packages>
diff --git a/ClosedXML_Examples/packages.config b/ClosedXML_Examples/packages.config
index b2df7ba..becf24f 100644
--- a/ClosedXML_Examples/packages.config
+++ b/ClosedXML_Examples/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net452" />
-</packages>
\ No newline at end of file
+  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net40" />
+</packages>
diff --git a/ClosedXML_Sandbox/packages.config b/ClosedXML_Sandbox/packages.config
index b2df7ba..becf24f 100644
--- a/ClosedXML_Sandbox/packages.config
+++ b/ClosedXML_Sandbox/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net452" />
-</packages>
\ No newline at end of file
+  <package id="DocumentFormat.OpenXml" version="2.7.2" targetFramework="net40" />
+</packages>