diff --git a/tools/run_tests/performance/run_worker_csharp.sh b/tools/run_tests/performance/run_worker_csharp.sh
index bfa59b5d9e6..af944f9fefa 100755
--- a/tools/run_tests/performance/run_worker_csharp.sh
+++ b/tools/run_tests/performance/run_worker_csharp.sh
@@ -18,6 +18,6 @@ set -ex
 cd "$(dirname "$0")/../../.."
 
 # needed to correctly locate testca
-cd src/csharp/Grpc.IntegrationTesting.QpsWorker/bin/Release/netcoreapp1.1
+cd src/csharp/Grpc.IntegrationTesting.QpsWorker/bin/Release/netcoreapp2.1
 
 dotnet exec Grpc.IntegrationTesting.QpsWorker.dll "$@"
diff --git a/tools/run_tests/run_interop_tests.py b/tools/run_tests/run_interop_tests.py
index 448b53a7207..d35dccd8d03 100755
--- a/tools/run_tests/run_interop_tests.py
+++ b/tools/run_tests/run_interop_tests.py
@@ -147,8 +147,8 @@ class CSharpLanguage:
 class CSharpCoreCLRLanguage:
 
     def __init__(self):
-        self.client_cwd = 'src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1'
-        self.server_cwd = 'src/csharp/Grpc.IntegrationTesting.Server/bin/Debug/netcoreapp1.1'
+        self.client_cwd = 'src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1'
+        self.server_cwd = 'src/csharp/Grpc.IntegrationTesting.Server/bin/Debug/netcoreapp2.1'
         self.safename = str(self)
 
     def client_cmd(self, args):
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index f1e1f539ff9..1c4d20ef6da 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -946,7 +946,7 @@ class CSharpLanguage(object):
         assembly_extension = '.exe'
 
         if self.args.compiler == 'coreclr':
-            assembly_subdir += '/netcoreapp1.1'
+            assembly_subdir += '/netcoreapp2.1'
             runtime_cmd = ['dotnet', 'exec']
             assembly_extension = '.dll'
         else: