diff --git a/pkgs/by-name/da/dafny/deps.json b/pkgs/by-name/da/dafny/deps.json
index fe629403b62f..ce1545664768 100644
--- a/pkgs/by-name/da/dafny/deps.json
+++ b/pkgs/by-name/da/dafny/deps.json
@@ -244,6 +244,16 @@
     "version": "1.1.0",
     "hash": "sha256-0AqQ2gMS8iNlYkrD+BxtIg7cXMnr9xZHtKAuN4bjfaQ="
   },
+  {
+    "pname": "Microsoft.NETFramework.ReferenceAssemblies",
+    "version": "1.0.3",
+    "hash": "sha256-FBoJP5DHZF0QHM0xLm9yd4HJZVQOuSpSKA+VQRpphEE="
+  },
+  {
+    "pname": "Microsoft.NETFramework.ReferenceAssemblies.net452",
+    "version": "1.0.3",
+    "hash": "sha256-RTPuFG8D7gnwINEoEtAqmVm4oTW8K4Z87v1o4DDeLMI="
+  },
   {
     "pname": "Microsoft.TestPlatform.Extensions.TrxLogger",
     "version": "17.9.0",
@@ -294,6 +304,11 @@
     "version": "2.6.81",
     "hash": "sha256-0Zshmi1IMWj9/MKUieffpgJxKhJyVgBXPKMg9RSDkRs="
   },
+  {
+    "pname": "NETStandard.Library",
+    "version": "2.0.3",
+    "hash": "sha256-Prh2RPebz/s8AzHb2sPHg3Jl8s31inv9k+Qxd293ybo="
+  },
   {
     "pname": "Newtonsoft.Json",
     "version": "11.0.2",
@@ -529,6 +544,11 @@
     "version": "4.3.0",
     "hash": "sha256-XqZWb4Kd04960h4U9seivjKseGA/YEIpdplfHYHQ9jk="
   },
+  {
+    "pname": "System.Buffers",
+    "version": "4.4.0",
+    "hash": "sha256-KTxAhYawFG2V5VX1jw3pzx3IrQXRgn1TsvgjPgxAbqA="
+  },
   {
     "pname": "System.Collections",
     "version": "4.3.0",
@@ -624,11 +644,21 @@
     "version": "4.1.0",
     "hash": "sha256-7zqB+FXgkvhtlBzpcZyd81xczWP0D3uWssyAGw3t7b4="
   },
+  {
+    "pname": "System.Memory",
+    "version": "4.5.3",
+    "hash": "sha256-Cvl7RbRbRu9qKzeRBWjavUkseT2jhZBUWV1SPipUWFk="
+  },
   {
     "pname": "System.Net.WebSockets",
     "version": "4.3.0",
     "hash": "sha256-l3h3cF1cCC9zMhWLKSDnZBZvFADUd0Afe2+iAwBA0r0="
   },
+  {
+    "pname": "System.Numerics.Vectors",
+    "version": "4.4.0",
+    "hash": "sha256-auXQK2flL/JpnB/rEcAcUm4vYMCYMEMiWOCAlIaqu2U="
+  },
   {
     "pname": "System.ObjectModel",
     "version": "4.0.12",
@@ -724,6 +754,11 @@
     "version": "4.4.0",
     "hash": "sha256-SeTI4+yVRO2SmAKgOrMni4070OD+Oo8L1YiEVeKDyig="
   },
+  {
+    "pname": "System.Runtime.CompilerServices.Unsafe",
+    "version": "4.5.2",
+    "hash": "sha256-8eUXXGWO2LL7uATMZye2iCpQOETn2jCcjUhG6coR5O8="
+  },
   {
     "pname": "System.Runtime.CompilerServices.Unsafe",
     "version": "4.7.1",
@@ -841,7 +876,7 @@
   },
   {
     "pname": "Tomlyn",
-    "version": "0.16.2",
-    "hash": "sha256-ULW4n8s2lvTMG3I18rpsVfXtKXN7C8nPrMXQowxGIsU="
+    "version": "0.17.0",
+    "hash": "sha256-pJHF7w8RJhV23wiI3qzm5el4qPlPlgYTmTKA8yGhzXY="
   }
 ]
diff --git a/pkgs/by-name/da/dafny/package.nix b/pkgs/by-name/da/dafny/package.nix
index 1b5cdecb3404..9484b7aadf7f 100644
--- a/pkgs/by-name/da/dafny/package.nix
+++ b/pkgs/by-name/da/dafny/package.nix
@@ -38,18 +38,18 @@ let
 in
 buildDotnetModule rec {
   pname = "Dafny";
-  version = "4.9.1";
+  version = "4.10.0";
 
   src = fetchFromGitHub {
     owner = "dafny-lang";
     repo = "dafny";
     tag = "v${version}";
-    hash = "sha256-fCBaOF1mDrqJaUiATZAhzLjlK3NGVFnxdOwgHbOkkgY=";
+    hash = "sha256-aPOjt4bwalhJUTJm4+pGqN88LwDP5zrVtakF26b3K4s=";
   };
 
   postPatch =
     let
-      runtimeJarVersion = "4.9.1";
+      runtimeJarVersion = "4.10.0";
     in
     ''
       cp ${writeScript "fake-gradlew-for-dafny" ''
@@ -66,13 +66,6 @@ buildDotnetModule rec {
       substituteInPlace Source/DafnyRuntime/DafnyRuntime.csproj \
         --replace-fail TargetFrameworks TargetFramework \
         --replace-fail "netstandard2.0;net452" net8.0
-
-      for f in Source/**/*.csproj ; do
-        [[ "$f" == "Source/DafnyRuntime/DafnyRuntime.csproj" ]] && continue;
-
-        substituteInPlace $f \
-          --replace-fail net6.0 net8.0
-      done
     '';
 
   dotnet-sdk = dotnetCorePackages.sdk_8_0;