diff --git a/scripts/TestAllDownloads.expected.txt b/scripts/TestAllDownloads.expected.txt
index 8ea620a..d047f27 100644
--- a/scripts/TestAllDownloads.expected.txt
+++ b/scripts/TestAllDownloads.expected.txt
@@ -143,3 +143,14 @@ TestAllDownloads/
           "elm-test-rs": "3.0.2"
         }
       }
+  8/
+    elm-tooling/
+      elm-test-rs/
+        3.1.0/
+          elm-test-rs
+    elm-tooling.json
+      {
+        "tools": {
+          "elm-test-rs": "3.1.0"
+        }
+      }
diff --git a/src/KnownTools.ts b/src/KnownTools.ts
index 9936d69..27bd809 100644
--- a/src/KnownTools.ts
+++ b/src/KnownTools.ts
@@ -1058,6 +1058,58 @@ const knownTools = {
         type: "zip",
       },
     },
+    "3.1.0": {
+      "darwin-arm64": {
+        hash: "c2e3c3356ff34fa454a2e13c863f196fc7220343e4393a128fb16db5bed3de67",
+        url: "https://github.com/mpizenberg/elm-test-rs/releases/download/v3.1.0/elm-test-rs_macos-arm.tar.gz",
+        fileSize: 2469905,
+        fileName: "elm-test-rs",
+        type: "tgz",
+      },
+      "darwin-x64": {
+        hash: "c6eea3fd24f341597bfd8669258e4ef5a0c02ad70a167182caec21be644e123b",
+        url: "https://github.com/mpizenberg/elm-test-rs/releases/download/v3.1.0/elm-test-rs_macos.tar.gz",
+        fileSize: 2630053,
+        fileName: "elm-test-rs",
+        type: "tgz",
+      },
+      "linux-arm": {
+        hash: "58c256726dc252dd4cc1d793256b3260e3872d9a4c51f02095b360268170813e",
+        url: "https://github.com/mpizenberg/elm-test-rs/releases/download/v3.1.0/elm-test-rs_linux-arm-32.tar.gz",
+        fileSize: 2109110,
+        fileName: "elm-test-rs",
+        type: "tgz",
+      },
+      "linux-arm64": {
+        hash: "8e3a0c058775fbaf83c1891af7d60af41f5112fad5cfc0171f8d6a7acd5630bb",
+        url: "https://github.com/mpizenberg/elm-test-rs/releases/download/v3.1.0/elm-test-rs_linux-arm-64.tar.gz",
+        fileSize: 2304348,
+        fileName: "elm-test-rs",
+        type: "tgz",
+      },
+      "linux-x64": {
+        hash: "364e3528222acbe916a679d079f583b1b4c70be9132297bb541572ce275ff95d",
+        url: "https://github.com/mpizenberg/elm-test-rs/releases/download/v3.1.0/elm-test-rs_linux.tar.gz",
+        fileSize: 2956378,
+        fileName: "elm-test-rs",
+        type: "tgz",
+      },
+      // WoW64.
+      "win32-arm64": {
+        hash: "66554f09d9e7ba74519fcc9151ca4ac15ae67bafb9123786dbc9e554766aa437",
+        url: "https://github.com/mpizenberg/elm-test-rs/releases/download/v3.1.0/elm-test-rs_windows.zip",
+        fileSize: 2338825,
+        fileName: "elm-test-rs.exe",
+        type: "zip",
+      },
+      "win32-x64": {
+        hash: "66554f09d9e7ba74519fcc9151ca4ac15ae67bafb9123786dbc9e554766aa437",
+        url: "https://github.com/mpizenberg/elm-test-rs/releases/download/v3.1.0/elm-test-rs_windows.zip",
+        fileSize: 2338825,
+        fileName: "elm-test-rs.exe",
+        type: "zip",
+      },
+    },
   },
 } as const;
 
diff --git a/tests/Tools.test.ts b/tests/Tools.test.ts
index c3eed07..4ce4120 100644
--- a/tests/Tools.test.ts
+++ b/tests/Tools.test.ts
@@ -121,6 +121,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -170,6 +171,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -225,6 +227,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -274,7 +277,8 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙2.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
-        ⧙[⧘▊⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘▊⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -323,6 +327,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -383,6 +388,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -440,6 +446,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -502,6 +509,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -561,6 +569,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -611,6 +620,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -675,6 +685,7 @@ describe("tools", () => {
         ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
         ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+        ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
       ⧙Up⧘/⧙Down⧘ to move
       ⧙Space⧘ to toggle
@@ -783,6 +794,7 @@ describe("tools", () => {
           ⧙[⧘ ⧙]⧘ ⧙3.0.0⧘
           ⧙[⧘ ⧙]⧘ ⧙3.0.1⧘
           ⧙[⧘ ⧙]⧘ ⧙3.0.2⧘
+          ⧙[⧘ ⧙]⧘ ⧙3.1.0⧘
 
         ⧙Up⧘/⧙Down⧘ to move
         ⧙Space⧘ to toggle