diff --git a/Directory.Packages.props b/Directory.Packages.props
index b02d0c4f0..3ea8c9ffd 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -4,7 +4,6 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="BouncyCastle.Cryptography" Version="2.7.0" />
-    <PackageVersion Include="FluentAssertions" Version="8.11.0" />
     <PackageVersion Include="Fractions" Version="8.3.2" />
     <PackageVersion Include="JsonPatch.Net" Version="5.0.3" />
     <PackageVersion Include="MartinCostello.Logging.XUnit" Version="0.7.1" />
diff --git a/tests/KubernetesClient.Tests/KubernetesClient.Tests.csproj b/tests/KubernetesClient.Tests/KubernetesClient.Tests.csproj
index 48bc1c094..e72522b2b 100644
--- a/tests/KubernetesClient.Tests/KubernetesClient.Tests.csproj
+++ b/tests/KubernetesClient.Tests/KubernetesClient.Tests.csproj
@@ -7,7 +7,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-      <PackageReference Include="FluentAssertions" />
       <PackageReference Include="Microsoft.Extensions.Logging" />
       <PackageReference Include="System.IO.Abstractions.TestingHelpers" />
       <PackageReference Include="System.Reactive" />
diff --git a/tests/KubernetesClient.Tests/OidcAuthTests.cs b/tests/KubernetesClient.Tests/OidcAuthTests.cs
index c05a52f10..b8f65c041 100644
--- a/tests/KubernetesClient.Tests/OidcAuthTests.cs
+++ b/tests/KubernetesClient.Tests/OidcAuthTests.cs
@@ -1,4 +1,3 @@
-using FluentAssertions;
 using k8s.Authentication;
 using k8s.Exceptions;
 using System;
@@ -27,16 +26,16 @@ public async Task TestOidcAuth()
             // use unexpired id token as bearer, do not attempt to refresh
             var auth = new OidcTokenProvider(clientId, clientSecret, idpIssuerUrl, unexpiredIdToken, refreshToken);
             var result = await auth.GetAuthenticationHeaderAsync(CancellationToken.None).ConfigureAwait(true);
-            result.Scheme.Should().Be("Bearer");
-            result.Parameter.Should().Be(unexpiredIdToken);
+            Assert.Equal("Bearer", result.Scheme);
+            Assert.Equal(unexpiredIdToken, result.Parameter);
 
             try
             {
                 // attempt to refresh id token when expired
                 auth = new OidcTokenProvider(clientId, clientSecret, idpIssuerUrl, expiredIdToken, refreshToken);
                 result = await auth.GetAuthenticationHeaderAsync(CancellationToken.None).ConfigureAwait(true);
-                result.Scheme.Should().Be("Bearer");
-                result.Parameter.Should().Be(expiredIdToken);
+                Assert.Equal("Bearer", result.Scheme);
+                Assert.Equal(expiredIdToken, result.Parameter);
                 Assert.Fail("should not be here");
             }
             catch (KubernetesClientException e)
@@ -49,8 +48,8 @@ public async Task TestOidcAuth()
                 // attempt to refresh id token when null
                 auth = new OidcTokenProvider(clientId, clientSecret, idpIssuerUrl, null, refreshToken);
                 result = await auth.GetAuthenticationHeaderAsync(CancellationToken.None).ConfigureAwait(true);
-                result.Scheme.Should().Be("Bearer");
-                result.Parameter.Should().Be(expiredIdToken);
+                Assert.Equal("Bearer", result.Scheme);
+                Assert.Equal(expiredIdToken, result.Parameter);
                 Assert.Fail("should not be here");
             }
             catch (KubernetesClientException e)
@@ -89,23 +88,23 @@ public async Task TestOidcAuthWithWireMock()
             var result = await auth.GetAuthenticationHeaderAsync(CancellationToken.None);
 
             // Assert
-            result.Scheme.Should().Be("Bearer");
-            result.Parameter.Should().Be(newIdToken);
+            Assert.Equal("Bearer", result.Scheme);
+            Assert.Equal(newIdToken, result.Parameter);
 
             // Verify that the expiry is set correctly
             var expectedExpiry = DateTimeOffset.UtcNow.AddSeconds(expiresIn);
             var actualExpiry = typeof(OidcTokenProvider)
                 .GetField("_expiry", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
                 ?.GetValue(auth) as DateTimeOffset?;
-            actualExpiry.Should().NotBeNull();
-            actualExpiry.Value.Should().BeCloseTo(expectedExpiry, precision: TimeSpan.FromSeconds(5));
+            Assert.NotNull(actualExpiry);
+            Assert.Equal(expectedExpiry, actualExpiry.Value, TimeSpan.FromSeconds(5));
 
             // Verify that the refresh token is set correctly
             var actualRefreshToken = typeof(OidcTokenProvider)
                 .GetField("_refreshToken", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
                 ?.GetValue(auth) as string;
-            actualRefreshToken.Should().NotBeNull();
-            actualRefreshToken.Should().Be(refreshToken);
+            Assert.NotNull(actualRefreshToken);
+            Assert.Equal(refreshToken, actualRefreshToken);
 
             // Stop the server
             server.Stop();
@@ -134,8 +133,8 @@ public async Task TestOidcAuthWithServerError()
             // Act & Assert
             var exception = await Assert.ThrowsAsync<KubernetesClientException>(
                 () => auth.GetAuthenticationHeaderAsync(CancellationToken.None));
-            exception.Message.Should().StartWith("Unable to refresh OIDC token.");
-            exception.InnerException.Message.Should().Contain("500");
+            Assert.StartsWith("Unable to refresh OIDC token.", exception.Message);
+            Assert.Contains("500", exception.InnerException.Message);
 
             // Stop the server
             server.Stop();
diff --git a/tests/KubernetesClient.Tests/TokenFileAuthTests.cs b/tests/KubernetesClient.Tests/TokenFileAuthTests.cs
index 5824917db..d36855373 100644
--- a/tests/KubernetesClient.Tests/TokenFileAuthTests.cs
+++ b/tests/KubernetesClient.Tests/TokenFileAuthTests.cs
@@ -1,4 +1,3 @@
-using FluentAssertions;
 using k8s.Authentication;
 using System;
 using System.Threading;
@@ -14,18 +13,18 @@ public async Task TestToken()
         {
             var auth = new TokenFileAuth("assets/token1");
             var result = await auth.GetAuthenticationHeaderAsync(CancellationToken.None).ConfigureAwait(true);
-            result.Scheme.Should().Be("Bearer");
-            result.Parameter.Should().Be("token1");
+            Assert.Equal("Bearer", result.Scheme);
+            Assert.Equal("token1", result.Parameter);
 
             auth.TokenFile = "assets/token2";
             result = await auth.GetAuthenticationHeaderAsync(CancellationToken.None).ConfigureAwait(true);
-            result.Scheme.Should().Be("Bearer");
-            result.Parameter.Should().Be("token1");
+            Assert.Equal("Bearer", result.Scheme);
+            Assert.Equal("token1", result.Parameter);
 
             auth.TokenExpiresAt = DateTime.UtcNow.AddSeconds(-1);
             result = await auth.GetAuthenticationHeaderAsync(CancellationToken.None).ConfigureAwait(true);
-            result.Scheme.Should().Be("Bearer");
-            result.Parameter.Should().Be("token2");
+            Assert.Equal("Bearer", result.Scheme);
+            Assert.Equal("token2", result.Parameter);
         }
     }
 }