diff --git a/appveyor.yml b/appveyor.yml
index e6fbe98..f2155df 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -13,7 +13,7 @@
   #---------------------------------#
 
   # version format (you need to bump it when changing version)
-  version: 1.5.2
+  version: 1.5.3
 
   # branches
   branches:
@@ -64,7 +64,7 @@
     - cmd: set GAMEDATA_FOLDER=%APPVEYOR_BUILD_FOLDER%\GameData
     - cmd: set ASSEMBLY_FOLDER=%GAMEDATA_FOLDER%\CommNetConstellation\Plugins
     # download required KSP DLLs
-    - cmd: curl -fsS -o%DOWNLOAD_FOLDER%\dlls.7z https://d237kiopfuf7h0.cloudfront.net/download/KSPDLL_1_9.zip
+    - cmd: curl -fsS -o%DOWNLOAD_FOLDER%\dlls.7z https://d237kiopfuf7h0.cloudfront.net/download/KSPDLL_1_9_1.zip
     # extract them
     - cmd: cd %DOWNLOAD_FOLDER% & dir
     - cmd: 7z.exe e -p%DLL_ARCH_PASS% -o%ASSEMBLY_FOLDER% %DOWNLOAD_FOLDER%\dlls.7z
@@ -212,7 +212,7 @@
   #---------------------------------#
 
   # version format (you need to bump it when changing version)
-  version: 1.5.2-{build}-{branch}
+  version: 1.5.3-{build}-{branch}
 
   # branches
   branches:
@@ -263,7 +263,7 @@
     - cmd: set GAMEDATA_FOLDER=%APPVEYOR_BUILD_FOLDER%\GameData
     - cmd: set ASSEMBLY_FOLDER=%GAMEDATA_FOLDER%\CommNetConstellation\Plugins
     # download required KSP DLLs
-    - cmd: curl -fsS -o%DOWNLOAD_FOLDER%\dlls.7z https://d237kiopfuf7h0.cloudfront.net/download/KSPDLL_1_9.zip
+    - cmd: curl -fsS -o%DOWNLOAD_FOLDER%\dlls.7z https://d237kiopfuf7h0.cloudfront.net/download/KSPDLL_1_9_1.zip
     # extract them
     - cmd: cd %DOWNLOAD_FOLDER% & dir
     - cmd: 7z.exe e -p%DLL_ARCH_PASS% -o%ASSEMBLY_FOLDER% %DOWNLOAD_FOLDER%\dlls.7z
diff --git a/src/CommNetConstellation/Properties/AssemblyInfo.cs b/src/CommNetConstellation/Properties/AssemblyInfo.cs
index aea0665..1409ebb 100644
--- a/src/CommNetConstellation/Properties/AssemblyInfo.cs
+++ b/src/CommNetConstellation/Properties/AssemblyInfo.cs
@@ -37,7 +37,7 @@
 // DLLs any time it changes.  Breaking on a minor revision is probably acceptable - it's
 // unlikely that there wouldn't be other breaking changes on a minor version change.
 [assembly: AssemblyVersion("1.5")]
-[assembly: AssemblyFileVersion("1.5.2")]
+[assembly: AssemblyFileVersion("1.5.3")]
 
 // Use KSPAssembly to allow other DLLs to make this DLL a dependency in a
 // non-hacky way in KSP.  Format is (AssemblyProduct, major, minor), and it