diff --git a/lib/database-upload.js b/lib/database-upload.js
index 9ebf9ab0ed..f6293a485a 100644
--- a/lib/database-upload.js
+++ b/lib/database-upload.js
@@ -50,6 +50,12 @@ async function uploadDatabases(repositoryNwo, config, apiDetails, logger) {
     const codeql = await (0, codeql_1.getCodeQL)(config.codeQLCmd);
     const uploadsUrl = new URL((0, util_1.parseGitHubUrl)(apiDetails.url));
     uploadsUrl.hostname = `uploads.${uploadsUrl.hostname}`;
+    // Octokit expects the baseUrl to not have a trailing slash,
+    // but it is included by default in a URL.
+    let uploadsBaseUrl = uploadsUrl.toString();
+    if (uploadsBaseUrl.endsWith("/")) {
+        uploadsBaseUrl = uploadsBaseUrl.slice(0, -1);
+    }
     for (const language of config.languages) {
         try {
             // Upload the database bundle.
@@ -62,7 +68,7 @@ async function uploadDatabases(repositoryNwo, config, apiDetails, logger) {
             const commitOid = await actionsUtil.getCommitOid(actionsUtil.getRequiredInput("checkout_path"));
             try {
                 await client.request(`POST /repos/:owner/:repo/code-scanning/codeql/databases/:language?name=:name&commit_oid=:commit_oid`, {
-                    baseUrl: uploadsUrl.toString(),
+                    baseUrl: uploadsBaseUrl,
                     owner: repositoryNwo.owner,
                     repo: repositoryNwo.repo,
                     language,
diff --git a/lib/database-upload.js.map b/lib/database-upload.js.map
index c1b93a6fd4..d5dbffbbe1 100644
--- a/lib/database-upload.js.map
+++ b/lib/database-upload.js.map
@@ -1 +1 @@
-{"version":3,"file":"database-upload.js","sourceRoot":"","sources":["../src/database-upload.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;AAAA,uCAAyB;AAEzB,4DAA8C;AAC9C,6CAA8D;AAC9D,qCAAqC;AAIrC,6CAA+B;AAC/B,iCAAkD;AAE3C,KAAK,UAAU,eAAe,CACnC,aAA4B,EAC5B,MAAc,EACd,UAA4B,EAC5B,MAAc;IAEd,IAAI,WAAW,CAAC,gBAAgB,CAAC,iBAAiB,CAAC,KAAK,MAAM,EAAE,CAAC;QAC/D,MAAM,CAAC,KAAK,CAAC,wDAAwD,CAAC,CAAC;QACvE,OAAO;IACT,CAAC;IAED,iDAAiD;IACjD,IACE,MAAM,CAAC,aAAa,CAAC,IAAI,KAAK,IAAI,CAAC,aAAa,CAAC,MAAM;QACvD,MAAM,CAAC,aAAa,CAAC,IAAI,KAAK,IAAI,CAAC,aAAa,CAAC,UAAU,EAC3D,CAAC;QACD,MAAM,CAAC,KAAK,CAAC,6DAA6D,CAAC,CAAC;QAC5E,OAAO;IACT,CAAC;IAED,IAAI,CAAC,CAAC,MAAM,WAAW,CAAC,wBAAwB,EAAE,CAAC,EAAE,CAAC;QACpD,4EAA4E;QAC5E,MAAM,CAAC,KAAK,CAAC,gDAAgD,CAAC,CAAC;QAC/D,OAAO;IACT,CAAC;IAED,MAAM,MAAM,GAAG,IAAA,yBAAY,GAAE,CAAC;IAC9B,MAAM,MAAM,GAAG,MAAM,IAAA,kBAAS,EAAC,MAAM,CAAC,SAAS,CAAC,CAAC;IAEjD,MAAM,UAAU,GAAG,IAAI,GAAG,CAAC,IAAA,qBAAc,EAAC,UAAU,CAAC,GAAG,CAAC,CAAC,CAAC;IAC3D,UAAU,CAAC,QAAQ,GAAG,WAAW,UAAU,CAAC,QAAQ,EAAE,CAAC;IAEvD,KAAK,MAAM,QAAQ,IAAI,MAAM,CAAC,SAAS,EAAE,CAAC;QACxC,IAAI,CAAC;YACH,8BAA8B;YAC9B,2EAA2E;YAC3E,8EAA8E;YAC9E,wEAAwE;YACxE,MAAM,SAAS,GAAG,MAAM,IAAA,eAAQ,EAAC,MAAM,EAAE,QAAQ,EAAE,MAAM,EAAE,QAAQ,CAAC,CAAC;YACrE,MAAM,aAAa,GAAG,EAAE,CAAC,QAAQ,CAAC,SAAS,CAAC,CAAC,IAAI,CAAC;YAClD,MAAM,mBAAmB,GAAG,EAAE,CAAC,gBAAgB,CAAC,SAAS,CAAC,CAAC;YAC3D,MAAM,SAAS,GAAG,MAAM,WAAW,CAAC,YAAY,CAC9C,WAAW,CAAC,gBAAgB,CAAC,eAAe,CAAC,CAC9C,CAAC;YACF,IAAI,CAAC;gBACH,MAAM,MAAM,CAAC,OAAO,CAClB,qGAAqG,EACrG;oBACE,OAAO,EAAE,UAAU,CAAC,QAAQ,EAAE;oBAC9B,KAAK,EAAE,aAAa,CAAC,KAAK;oBAC1B,IAAI,EAAE,aAAa,CAAC,IAAI;oBACxB,QAAQ;oBACR,IAAI,EAAE,GAAG,QAAQ,WAAW;oBAC5B,UAAU,EAAE,SAAS;oBACrB,IAAI,EAAE,mBAAmB;oBACzB,OAAO,EAAE;wBACP,aAAa,EAAE,SAAS,UAAU,CAAC,IAAI,EAAE;wBACzC,cAAc,EAAE,iBAAiB;wBACjC,gBAAgB,EAAE,aAAa;qBAChC;iBACF,CACF,CAAC;gBACF,MAAM,CAAC,KAAK,CAAC,sCAAsC,QAAQ,EAAE,CAAC,CAAC;YACjE,CAAC;oBAAS,CAAC;gBACT,mBAAmB,CAAC,KAAK,EAAE,CAAC;YAC9B,CAAC;QACH,CAAC;QAAC,OAAO,CAAC,EAAE,CAAC;YACX,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;YACf,4CAA4C;YAC5C,MAAM,CAAC,OAAO,CAAC,iCAAiC,QAAQ,KAAK,CAAC,EAAE,CAAC,CAAC;QACpE,CAAC;IACH,CAAC;AACH,CAAC;AAxED,0CAwEC"}
\ No newline at end of file
+{"version":3,"file":"database-upload.js","sourceRoot":"","sources":["../src/database-upload.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;AAAA,uCAAyB;AAEzB,4DAA8C;AAC9C,6CAA8D;AAC9D,qCAAqC;AAIrC,6CAA+B;AAC/B,iCAAkD;AAE3C,KAAK,UAAU,eAAe,CACnC,aAA4B,EAC5B,MAAc,EACd,UAA4B,EAC5B,MAAc;IAEd,IAAI,WAAW,CAAC,gBAAgB,CAAC,iBAAiB,CAAC,KAAK,MAAM,EAAE,CAAC;QAC/D,MAAM,CAAC,KAAK,CAAC,wDAAwD,CAAC,CAAC;QACvE,OAAO;IACT,CAAC;IAED,iDAAiD;IACjD,IACE,MAAM,CAAC,aAAa,CAAC,IAAI,KAAK,IAAI,CAAC,aAAa,CAAC,MAAM;QACvD,MAAM,CAAC,aAAa,CAAC,IAAI,KAAK,IAAI,CAAC,aAAa,CAAC,UAAU,EAC3D,CAAC;QACD,MAAM,CAAC,KAAK,CAAC,6DAA6D,CAAC,CAAC;QAC5E,OAAO;IACT,CAAC;IAED,IAAI,CAAC,CAAC,MAAM,WAAW,CAAC,wBAAwB,EAAE,CAAC,EAAE,CAAC;QACpD,4EAA4E;QAC5E,MAAM,CAAC,KAAK,CAAC,gDAAgD,CAAC,CAAC;QAC/D,OAAO;IACT,CAAC;IAED,MAAM,MAAM,GAAG,IAAA,yBAAY,GAAE,CAAC;IAC9B,MAAM,MAAM,GAAG,MAAM,IAAA,kBAAS,EAAC,MAAM,CAAC,SAAS,CAAC,CAAC;IAEjD,MAAM,UAAU,GAAG,IAAI,GAAG,CAAC,IAAA,qBAAc,EAAC,UAAU,CAAC,GAAG,CAAC,CAAC,CAAC;IAC3D,UAAU,CAAC,QAAQ,GAAG,WAAW,UAAU,CAAC,QAAQ,EAAE,CAAC;IAEvD,4DAA4D;IAC5D,0CAA0C;IAC1C,IAAI,cAAc,GAAG,UAAU,CAAC,QAAQ,EAAE,CAAC;IAC3C,IAAI,cAAc,CAAC,QAAQ,CAAC,GAAG,CAAC,EAAE,CAAC;QACjC,cAAc,GAAG,cAAc,CAAC,KAAK,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,CAAC;IAC/C,CAAC;IAED,KAAK,MAAM,QAAQ,IAAI,MAAM,CAAC,SAAS,EAAE,CAAC;QACxC,IAAI,CAAC;YACH,8BAA8B;YAC9B,2EAA2E;YAC3E,8EAA8E;YAC9E,wEAAwE;YACxE,MAAM,SAAS,GAAG,MAAM,IAAA,eAAQ,EAAC,MAAM,EAAE,QAAQ,EAAE,MAAM,EAAE,QAAQ,CAAC,CAAC;YACrE,MAAM,aAAa,GAAG,EAAE,CAAC,QAAQ,CAAC,SAAS,CAAC,CAAC,IAAI,CAAC;YAClD,MAAM,mBAAmB,GAAG,EAAE,CAAC,gBAAgB,CAAC,SAAS,CAAC,CAAC;YAC3D,MAAM,SAAS,GAAG,MAAM,WAAW,CAAC,YAAY,CAC9C,WAAW,CAAC,gBAAgB,CAAC,eAAe,CAAC,CAC9C,CAAC;YACF,IAAI,CAAC;gBACH,MAAM,MAAM,CAAC,OAAO,CAClB,qGAAqG,EACrG;oBACE,OAAO,EAAE,cAAc;oBACvB,KAAK,EAAE,aAAa,CAAC,KAAK;oBAC1B,IAAI,EAAE,aAAa,CAAC,IAAI;oBACxB,QAAQ;oBACR,IAAI,EAAE,GAAG,QAAQ,WAAW;oBAC5B,UAAU,EAAE,SAAS;oBACrB,IAAI,EAAE,mBAAmB;oBACzB,OAAO,EAAE;wBACP,aAAa,EAAE,SAAS,UAAU,CAAC,IAAI,EAAE;wBACzC,cAAc,EAAE,iBAAiB;wBACjC,gBAAgB,EAAE,aAAa;qBAChC;iBACF,CACF,CAAC;gBACF,MAAM,CAAC,KAAK,CAAC,sCAAsC,QAAQ,EAAE,CAAC,CAAC;YACjE,CAAC;oBAAS,CAAC;gBACT,mBAAmB,CAAC,KAAK,EAAE,CAAC;YAC9B,CAAC;QACH,CAAC;QAAC,OAAO,CAAC,EAAE,CAAC;YACX,OAAO,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC;YACf,4CAA4C;YAC5C,MAAM,CAAC,OAAO,CAAC,iCAAiC,QAAQ,KAAK,CAAC,EAAE,CAAC,CAAC;QACpE,CAAC;IACH,CAAC;AACH,CAAC;AA/ED,0CA+EC"}
\ No newline at end of file
diff --git a/lib/database-upload.test.js b/lib/database-upload.test.js
index 03e32595ce..fe26f0232a 100644
--- a/lib/database-upload.test.js
+++ b/lib/database-upload.test.js
@@ -177,7 +177,7 @@ async function mockHttpRequests(databaseUploadStatusCode) {
         }, (0, testing_utils_1.getRecordingLogger)(loggedMessages));
         t.assert(loggedMessages.find((v) => v.type === "debug" &&
             v.message === "Successfully uploaded database for javascript") !== undefined);
-        t.assert(databaseUploadSpy.calledOnceWith(sinon.match.string, sinon.match.has("baseUrl", "https://uploads.tenant.ghe.com/")));
+        t.assert(databaseUploadSpy.calledOnceWith(sinon.match.string, sinon.match.has("baseUrl", "https://uploads.tenant.ghe.com")));
     });
 });
 //# sourceMappingURL=database-upload.test.js.map
\ No newline at end of file
diff --git a/lib/database-upload.test.js.map b/lib/database-upload.test.js.map
index 809979eca7..a0051f0bef 100644
--- a/lib/database-upload.test.js.map
+++ b/lib/database-upload.test.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/src/database-upload.test.ts b/src/database-upload.test.ts
index b820c3fc64..8216a62f09 100644
--- a/src/database-upload.test.ts
+++ b/src/database-upload.test.ts
@@ -259,7 +259,7 @@ test("Successfully uploading a database to GHEC-DR", async (t) => {
     t.assert(
       databaseUploadSpy.calledOnceWith(
         sinon.match.string,
-        sinon.match.has("baseUrl", "https://uploads.tenant.ghe.com/"),
+        sinon.match.has("baseUrl", "https://uploads.tenant.ghe.com"),
       ),
     );
   });
diff --git a/src/database-upload.ts b/src/database-upload.ts
index d951c3c2c8..142fa0b2d6 100644
--- a/src/database-upload.ts
+++ b/src/database-upload.ts
@@ -41,6 +41,13 @@ export async function uploadDatabases(
   const uploadsUrl = new URL(parseGitHubUrl(apiDetails.url));
   uploadsUrl.hostname = `uploads.${uploadsUrl.hostname}`;
 
+  // Octokit expects the baseUrl to not have a trailing slash,
+  // but it is included by default in a URL.
+  let uploadsBaseUrl = uploadsUrl.toString();
+  if (uploadsBaseUrl.endsWith("/")) {
+    uploadsBaseUrl = uploadsBaseUrl.slice(0, -1);
+  }
+
   for (const language of config.languages) {
     try {
       // Upload the database bundle.
@@ -57,7 +64,7 @@ export async function uploadDatabases(
         await client.request(
           `POST /repos/:owner/:repo/code-scanning/codeql/databases/:language?name=:name&commit_oid=:commit_oid`,
           {
-            baseUrl: uploadsUrl.toString(),
+            baseUrl: uploadsBaseUrl,
             owner: repositoryNwo.owner,
             repo: repositoryNwo.repo,
             language,