diff --git a/CHANGELOG.md b/CHANGELOG.md
index c47a74f..99fd041 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Fixes
 
+- Warn instead of silently ignoring `InAppInclude` / `InAppExclude` when a sentry-dotnet bump moves the internal members they are read through ([#144](https://github.com/getsentry/sentry-powershell/pull/144))
 - Remove the `SdkComposer` fallback transport in `SynchronousWorker`, which has thrown since the sentry-dotnet 5.1.1 bump. The SDK's own default worker and transport are used instead ([#143](https://github.com/getsentry/sentry-powershell/pull/143))
 - Silence CS1701/CS1702 warnings emitted by `Add-Type` when importing the module on PowerShell hosts whose runtime `System.Runtime` version differs from the one `Sentry.dll` was compiled against ([#129](https://github.com/getsentry/sentry-powershell/pull/129))
 
diff --git a/modules/Sentry/private/StackTraceProcessor.ps1 b/modules/Sentry/private/StackTraceProcessor.ps1
index 73fedeb..08ffaf9 100644
--- a/modules/Sentry/private/StackTraceProcessor.ps1
+++ b/modules/Sentry/private/StackTraceProcessor.ps1
@@ -8,6 +8,8 @@ class StackTraceProcessor : SentryEventProcessor {
     hidden [hashtable] $pwshModules = @{}
     hidden [System.Collections.IEnumerable] $inAppInclude
     hidden [System.Collections.IEnumerable] $inAppExclude
+    # A hashtable rather than typed FieldInfo properties, for the reason given in SynchronousTransport.
+    hidden [hashtable] $stringOrRegexFields = @{}
 
     StackTraceProcessor([Sentry.SentryOptions] $options) {
         $this.logger = $options.DiagnosticLogger
@@ -23,29 +25,43 @@ class StackTraceProcessor : SentryEventProcessor {
             $this.modulePaths = $env:PSModulePath -split ':'
         }
 
-        # The SentryOptions.InAppInclude / InAppExclude lists are internal; read them via reflection.
-        # Entries are Sentry.StringOrRegex (string prefix or compiled regex) per the .NET SDK.
-        $flags = [System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Instance
-        $includeProp = [Sentry.SentryOptions].GetProperty('InAppInclude', $flags)
-        $excludeProp = [Sentry.SentryOptions].GetProperty('InAppExclude', $flags)
-        if ($null -ne $includeProp) {
-            $this.inAppInclude = $includeProp.GetValue($options)
+        # InAppInclude / InAppExclude and the StringOrRegex value fields are internal to sentry-dotnet.
+        try {
+            $this.inAppInclude = [StackTraceProcessor]::GetInternalMember([Sentry.SentryOptions], 'InAppInclude').GetValue($options)
+            $this.inAppExclude = [StackTraceProcessor]::GetInternalMember([Sentry.SentryOptions], 'InAppExclude').GetValue($options)
+            $this.stringOrRegexFields['_string'] = [StackTraceProcessor]::GetInternalMember([Sentry.StringOrRegex], '_string')
+            $this.stringOrRegexFields['_regex'] = [StackTraceProcessor]::GetInternalMember([Sentry.StringOrRegex], '_regex')
+        } catch {
+            Write-Warning "Ignoring InAppInclude / InAppExclude: $_"
+            if ($global:SentryPowershellRethrowErrors -eq $true) {
+                throw
+            }
+            $this.inAppInclude = $null
+            $this.inAppExclude = $null
+        }
+    }
+
+    # Throws on a miss so an SDK bump that moves a member is reported instead of silently dropping the option.
+    hidden static [System.Reflection.MemberInfo] GetInternalMember([type] $type, [string] $name) {
+        $flags = [System.Reflection.BindingFlags]::Instance -bor [System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Public
+        $member = $type.GetProperty($name, $flags)
+        if ($null -eq $member) {
+            $member = $type.GetField($name, $flags)
         }
-        if ($null -ne $excludeProp) {
-            $this.inAppExclude = $excludeProp.GetValue($options)
+        if ($null -eq $member) {
+            throw "Failed to find internal member '$name' on $type"
         }
+        return $member
     }
 
-    hidden static [bool] MatchesAny([System.Collections.IEnumerable] $patterns, [string] $module) {
+    hidden [bool] MatchesAny([System.Collections.IEnumerable] $patterns, [string] $module) {
         if ($null -eq $patterns -or [string]::IsNullOrEmpty($module)) {
             return $false
         }
         foreach ($item in $patterns) {
-            # StringOrRegex has private _string / _regex fields, exactly one set.
-            $type = $item.GetType()
-            $flags = [System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Instance
-            $stringValue = $type.GetField('_string', $flags).GetValue($item)
-            $regexValue = $type.GetField('_regex', $flags).GetValue($item)
+            # Exactly one of the two is set.
+            $stringValue = $this.stringOrRegexFields['_string'].GetValue($item)
+            $regexValue = $this.stringOrRegexFields['_regex'].GetValue($item)
             if (-not [string]::IsNullOrEmpty($stringValue)) {
                 # Prefix match, matching .NET SDK namespace semantics ("Foo" matches "Foo" and "Foo.Bar").
                 # Case-insensitive on both halves, consistent with sentry-dotnet and PS module name resolution.
@@ -65,10 +81,10 @@ class StackTraceProcessor : SentryEventProcessor {
         # InAppExclude wins, then InAppInclude. Falls back to the PS default: user-script frames (no module)
         # are in-app; module frames are not. This default differs from sentry-dotnet because PS module
         # frames are almost always third-party.
-        if ([StackTraceProcessor]::MatchesAny($this.inAppExclude, $module)) {
+        if ($this.MatchesAny($this.inAppExclude, $module)) {
             return $false
         }
-        if ([StackTraceProcessor]::MatchesAny($this.inAppInclude, $module)) {
+        if ($this.MatchesAny($this.inAppInclude, $module)) {
             return $true
         }
         return [string]::IsNullOrEmpty($module)
diff --git a/tests/sdk-internals.tests.ps1 b/tests/sdk-internals.tests.ps1
index ea9998d..b99f24a 100644
--- a/tests/sdk-internals.tests.ps1
+++ b/tests/sdk-internals.tests.ps1
@@ -4,6 +4,8 @@
 BeforeAll {
     . "$PSScriptRoot/utils.ps1"
     . "$PSScriptRoot/../modules/Sentry/private/SynchronousTransport.ps1"
+    . "$PSScriptRoot/../modules/Sentry/private/StackTraceProcessor.ps1"
+    $global:SentryPowershellRethrowErrors = $true
 
     $instanceFlags = [System.Reflection.BindingFlags]::Instance + [System.Reflection.BindingFlags]::NonPublic + [System.Reflection.BindingFlags]::Public
     $staticFlags = [System.Reflection.BindingFlags]::Static + [System.Reflection.BindingFlags]::NonPublic + [System.Reflection.BindingFlags]::Public
@@ -19,6 +21,10 @@ BeforeAll {
     }
 }
 
+AfterAll {
+    $global:SentryPowershellRethrowErrors = $false
+}
+
 Describe 'Sentry SDK internals used by SynchronousTransport' {
     It 'HttpTransportBase.ProcessEnvelope' {
         $method = [Sentry.Http.HttpTransportBase].GetMethod('ProcessEnvelope', $instanceFlags)
@@ -54,6 +60,32 @@ Describe 'Sentry SDK internals used by Get-CurrentOptions' {
     }
 }
 
+Describe 'Sentry SDK internals used by StackTraceProcessor' {
+    It 'SentryOptions.InAppInclude' {
+        $property = [Sentry.SentryOptions].GetProperty('InAppInclude', $instanceFlags)
+        $property | Should -Not -BeNullOrEmpty
+        [System.Collections.Generic.IEnumerable[Sentry.StringOrRegex]].IsAssignableFrom($property.PropertyType) | Should -BeTrue
+    }
+
+    It 'SentryOptions.InAppExclude' {
+        $property = [Sentry.SentryOptions].GetProperty('InAppExclude', $instanceFlags)
+        $property | Should -Not -BeNullOrEmpty
+        [System.Collections.Generic.IEnumerable[Sentry.StringOrRegex]].IsAssignableFrom($property.PropertyType) | Should -BeTrue
+    }
+
+    It 'StringOrRegex._string' {
+        $field = [Sentry.StringOrRegex].GetField('_string', $instanceFlags)
+        $field | Should -Not -BeNullOrEmpty
+        $field.FieldType.FullName | Should -Be 'System.String'
+    }
+
+    It 'StringOrRegex._regex' {
+        $field = [Sentry.StringOrRegex].GetField('_regex', $instanceFlags)
+        $field | Should -Not -BeNullOrEmpty
+        $field.FieldType.FullName | Should -Be 'System.Text.RegularExpressions.Regex'
+    }
+}
+
 Describe 'SynchronousTransport' {
     It 'resolves every internal member it needs' {
         # The constructor does all of the above lookups and throws on any that fail.
@@ -62,3 +94,9 @@ Describe 'SynchronousTransport' {
         { [SynchronousTransport]::new($options) } | Should -Not -Throw
     }
 }
+
+Describe 'StackTraceProcessor' {
+    It 'resolves every internal member it needs' {
+        { [StackTraceProcessor]::new([Sentry.SentryOptions]::new()) } | Should -Not -Throw
+    }
+}
diff --git a/tests/stacktrace-processor.tests.ps1 b/tests/stacktrace-processor.tests.ps1
index 5be40d7..662012b 100644
--- a/tests/stacktrace-processor.tests.ps1
+++ b/tests/stacktrace-processor.tests.ps1
@@ -103,13 +103,8 @@ at <ScriptBlock>, : line 3' -split "[`r`n]+"
             $sut.ResolveInApp((MakeFrame 'Foo')) | Should -BeFalse
         }
 
-        It 'Sentry.StringOrRegex still exposes the private fields we reflect on' {
-            # ResolveInApp reaches into the internal _string / _regex fields of Sentry.StringOrRegex.
-            # If a sentry-dotnet bump renames these, this fails so we catch it at upgrade time rather
-            # than silently no-op-ing InAppInclude/InAppExclude in production.
-            $flags = [System.Reflection.BindingFlags]::NonPublic -bor [System.Reflection.BindingFlags]::Instance
-            [Sentry.StringOrRegex].GetField('_string', $flags) | Should -Not -BeNullOrEmpty
-            [Sentry.StringOrRegex].GetField('_regex', $flags) | Should -Not -BeNullOrEmpty
+        It 'Names the missing member when the SDK internals it reflects on have moved' {
+            { [StackTraceProcessor]::GetInternalMember([Sentry.StringOrRegex], 'NoSuchMember') } | Should -Throw '*NoSuchMember*'
         }
     }
 }