diff --git a/pkgs/development/compilers/cudatoolkit/default.nix b/pkgs/development/compilers/cudatoolkit/default.nix
index 472e2a9d59b..8f9f6e19993 100644
--- a/pkgs/development/compilers/cudatoolkit/default.nix
+++ b/pkgs/development/compilers/cudatoolkit/default.nix
@@ -193,9 +193,15 @@ in {
   };
 
   cudatoolkit9 = common {
-    version = "9.0.176";
-    url = "https://developer.nvidia.com/compute/cuda/9.0/Prod/local_installers/cuda_9.0.176_384.81_linux-run";
-    sha256 = "0308rmmychxfa4inb1ird9bpgfppgr9yrfg1qp0val5azqik91ln";
+    version = "9.1.85.1";
+    url = "https://developer.nvidia.com/compute/cuda/9.1/Prod/local_installers/cuda_9.1.85_387.26_linux";
+    sha256 = "0lz9bwhck1ax4xf1fyb5nicb7l1kssslj518z64iirpy2qmwg5l4";
+    runPatches = [
+      (fetchurl {
+        url = "https://developer.nvidia.com/compute/cuda/9.1/Prod/patches/1/cuda_9.1.85.1_linux";
+        sha256 = "1f53ij5nb7g0vb5pcpaqvkaj1x4mfq3l0mhkfnqbk8sfrvby775g";
+      })
+    ];
     gcc = gcc6;
   };
 
diff --git a/pkgs/development/libraries/science/math/cudnn/default.nix b/pkgs/development/libraries/science/math/cudnn/default.nix
index d6e55e7bf73..f5715157531 100644
--- a/pkgs/development/libraries/science/math/cudnn/default.nix
+++ b/pkgs/development/libraries/science/math/cudnn/default.nix
@@ -40,6 +40,6 @@ in
     version = "7.0.5";
     cudatoolkit = cudatoolkit9;
     srcName = "cudnn-${cudatoolkit.majorVersion}-linux-x64-v7.tgz";
-    sha256 = "1a3e076447d5b9860c73d9bebe7087ffcb7b0c8814fd1e506096435a2ad9ab0e";
+    sha256 = "1rfmdd2v47p83fm3sfyvik31gci0q17qs6kjng6mvcsd6akmvb8y";
   };
 }