diff --git a/lib/modules/manager/pep621/artifacts.spec.ts b/lib/modules/manager/pep621/artifacts.spec.ts
index ebcc935879894b..d28645cf794350 100644
--- a/lib/modules/manager/pep621/artifacts.spec.ts
+++ b/lib/modules/manager/pep621/artifacts.spec.ts
@@ -123,7 +123,7 @@ requires-python = "<3.9"
             '&& ' +
             'install-tool pdm v2.5.0 ' +
             '&& ' +
-            'pdm update dep1' +
+            'pdm update --no-sync dep1' +
             '"',
           options: {
             cwd: '/tmp/github/some/repo',
diff --git a/lib/modules/manager/pep621/processors/pdm.spec.ts b/lib/modules/manager/pep621/processors/pdm.spec.ts
index a7588535d0e567..4e1c77a1f4ae4c 100644
--- a/lib/modules/manager/pep621/processors/pdm.spec.ts
+++ b/lib/modules/manager/pep621/processors/pdm.spec.ts
@@ -86,7 +86,7 @@ describe('modules/manager/pep621/processors/pdm', () => {
             '&& ' +
             'install-tool pdm v2.5.0 ' +
             '&& ' +
-            'pdm update dep1' +
+            'pdm update --no-sync dep1' +
             '"',
         },
       ]);
@@ -173,16 +173,16 @@ describe('modules/manager/pep621/processors/pdm', () => {
       ]);
       expect(execSnapshots).toMatchObject([
         {
-          cmd: 'pdm update dep1 dep2',
+          cmd: 'pdm update --no-sync dep1 dep2',
         },
         {
-          cmd: 'pdm update -G group1 dep3 dep4',
+          cmd: 'pdm update --no-sync -G group1 dep3 dep4',
         },
         {
-          cmd: 'pdm update -dG group2 dep5 dep6',
+          cmd: 'pdm update --no-sync -dG group2 dep5 dep6',
         },
         {
-          cmd: 'pdm update -dG group3 dep7 dep8',
+          cmd: 'pdm update --no-sync -dG group3 dep7 dep8',
         },
       ]);
     });
@@ -224,7 +224,7 @@ describe('modules/manager/pep621/processors/pdm', () => {
       ]);
       expect(execSnapshots).toMatchObject([
         {
-          cmd: 'pdm update',
+          cmd: 'pdm update --no-sync',
           options: {
             cwd: '/tmp/github/some/repo/folder',
           },
diff --git a/lib/modules/manager/pep621/processors/pdm.ts b/lib/modules/manager/pep621/processors/pdm.ts
index 365c2d2a64ad41..9e630952f9e957 100644
--- a/lib/modules/manager/pep621/processors/pdm.ts
+++ b/lib/modules/manager/pep621/processors/pdm.ts
@@ -15,6 +15,8 @@ import type { PyProject } from '../schema';
 import { depTypes, parseDependencyGroupRecord } from '../utils';
 import type { PyProjectProcessor } from './types';
 
+const pdmUpdateCMD = 'pdm update --no-sync';
+
 export class PdmProcessor implements PyProjectProcessor {
   process(project: PyProject, deps: PackageDependency[]): PackageDependency[] {
     const pdm = project.tool?.pdm;
@@ -87,7 +89,7 @@ export class PdmProcessor implements PyProjectProcessor {
       // else only update specific packages
       const cmds: string[] = [];
       if (isLockFileMaintenance) {
-        cmds.push('pdm update');
+        cmds.push(pdmUpdateCMD);
       } else {
         cmds.push(...generateCMDs(updatedDeps));
       }
@@ -135,16 +137,24 @@ function generateCMDs(updatedDeps: Upgrade[]): string[] {
     switch (dep.depType) {
       case depTypes.optionalDependencies: {
         const [group, name] = dep.depName!.split('/');
-        addPackageToCMDRecord(packagesByCMD, `pdm update -G ${group}`, name);
+        addPackageToCMDRecord(
+          packagesByCMD,
+          `${pdmUpdateCMD} -G ${group}`,
+          name
+        );
         break;
       }
       case depTypes.pdmDevDependencies: {
         const [group, name] = dep.depName!.split('/');
-        addPackageToCMDRecord(packagesByCMD, `pdm update -dG ${group}`, name);
+        addPackageToCMDRecord(
+          packagesByCMD,
+          `${pdmUpdateCMD} -dG ${group}`,
+          name
+        );
         break;
       }
       default: {
-        addPackageToCMDRecord(packagesByCMD, `pdm update`, dep.packageName!);
+        addPackageToCMDRecord(packagesByCMD, pdmUpdateCMD, dep.packageName!);
       }
     }
   }