diff --git a/Podfile.lock b/Podfile.lock
index 3ae641b9b..05cec605f 100644
--- a/Podfile.lock
+++ b/Podfile.lock
@@ -168,7 +168,7 @@ SPEC CHECKSUMS:
   PureLayout: 4d550abe49a94f24c2808b9b95db9131685fe4cd
   Reachability: 33e18b67625424e47b6cde6d202dce689ad7af96
   SAMKeychain: 483e1c9f32984d50ca961e26818a534283b4cd5c
-  SignalServiceKit: bfac5572f3a1ff8a853ead9b5413274a075f3cb4
+  SignalServiceKit: 1594ae26a08129175c6ca91690602aa47898f24c
   SocketRocket: dbb1554b8fc288ef8ef370d6285aeca7361be31e
   SQLCipher: 43d12c0eb9c57fb438749618fc3ce0065509a559
   TwistedOakCollapsingFutures: f359b90f203e9ab13dfb92c9ff41842a7fe1cd0c
diff --git a/Signal.xcodeproj/project.pbxproj b/Signal.xcodeproj/project.pbxproj
index 324703f87..5a1e56b02 100644
--- a/Signal.xcodeproj/project.pbxproj
+++ b/Signal.xcodeproj/project.pbxproj
@@ -2090,6 +2090,7 @@
 				"${PODS_ROOT}/SAMKeychain/Support/SAMKeychain.bundle",
 				"${PODS_ROOT}/../SignalServiceKit/src/Security/PinningCertificate/textsecure.cer",
 				"${PODS_ROOT}/../SignalServiceKit/src/Security/PinningCertificate/GIAG2.crt",
+				"${PODS_ROOT}/../SignalServiceKit/src/Security/PinningCertificate/GTSGIAG3.crt",
 			);
 			name = "[CP] Copy Pods Resources";
 			outputPaths = (
diff --git a/SignalServiceKit.podspec b/SignalServiceKit.podspec
index b71357df1..5c2cf8eae 100644
--- a/SignalServiceKit.podspec
+++ b/SignalServiceKit.podspec
@@ -28,7 +28,8 @@ An Objective-C library for communicating with the Signal messaging service.
   s.source_files = 'SignalServiceKit/src/**/*.{h,m,mm}'
 
   s.resources = ['SignalServiceKit/src/Security/PinningCertificate/textsecure.cer',
-                 'SignalServiceKit/src/Security/PinningCertificate/GIAG2.crt']
+                 'SignalServiceKit/src/Security/PinningCertificate/GIAG2.crt',
+                 'SignalServiceKit/src/Security/PinningCertificate/GTSGIAG3.crt']
   s.prefix_header_file = 'SignalServiceKit/src/TSPrefix.h'
   s.xcconfig = { 'OTHER_CFLAGS' => '$(inherited) -DSQLITE_HAS_CODEC' }
 
diff --git a/SignalServiceKit/src/Network/OWSSignalService.m b/SignalServiceKit/src/Network/OWSSignalService.m
index 037ab126c..90fee8fb0 100644
--- a/SignalServiceKit/src/Network/OWSSignalService.m
+++ b/SignalServiceKit/src/Network/OWSSignalService.m
@@ -5,6 +5,7 @@
 #import "OWSSignalService.h"
 #import "NSNotificationCenter+OWS.h"
 #import "OWSCensorshipConfiguration.h"
+#import "OWSError.h"
 #import "OWSHTTPSecurityPolicy.h"
 #import "TSAccountManager.h"
 #import "TSConstants.h"
@@ -259,35 +260,63 @@ NSString *const kNSNotificationName_IsCensorshipCircumventionActiveDidChange =
 
 #pragma mark - Google Pinning Policy
 
++ (nullable NSData *)certificateDataWithName:(NSString *)name error:(NSError **)error
+{
+    if (!name.length) {
+        OWSFail(@"%@ expected name with length > 0", self.tag);
+        *error = OWSErrorMakeAssertionError();
+        return nil;
+    }
+
+    NSString *path = [NSBundle.mainBundle pathForResource:name ofType:@"crt"];
+    if (![[NSFileManager defaultManager] fileExistsAtPath:path]) {
+        OWSFail(@"%@ Missing certificate for name: %@", self.tag, name);
+        *error = OWSErrorMakeAssertionError();
+        return nil;
+    }
+
+    NSData *_Nullable certData = [NSData dataWithContentsOfFile:path options:0 error:error];
+
+    if (*error != nil) {
+        OWSFail(@"%@ Failed to read cert file with path: %@", self.tag, path);
+        return nil;
+    }
+
+    if (certData.length == 0) {
+        OWSFail(@"%@ empty certData for name: %@", self.tag, name);
+        return nil;
+    }
+
+    DDLogVerbose(@"%@ read cert data with name: %@ length: %lu", self.tag, name, (unsigned long)certData.length);
+    return certData;
+}
+
 /**
  * We use the Google Pinning Policy when connecting to our censorship circumventing reflector,
  * which is hosted on Google.
  */
-+ (AFSecurityPolicy *)googlePinningPolicy {
++ (AFSecurityPolicy *)googlePinningPolicy
+{
     static AFSecurityPolicy *securityPolicy = nil;
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
         NSError *error;
-        NSString *path = [NSBundle.mainBundle pathForResource:@"GIAG2" ofType:@"crt"];
-
-        if (![[NSFileManager defaultManager] fileExistsAtPath:path]) {
-            @throw [NSException
-                    exceptionWithName:@"Missing server certificate"
-                    reason:[NSString stringWithFormat:@"Missing signing certificate for service googlePinningPolicy"]
-                    userInfo:nil];
+        NSData *GIAG2CertData = [self certificateDataWithName:@"GIAG2" error:&error];
+        if (error) {
+            DDLogError(@"%@ Failed to get GIAG2 certificate data with error: %@", self.tag, error);
+            @throw [NSException exceptionWithName:@"OWSSignalService_UnableToReadCertificate"
+                                           reason:error.description
+                                         userInfo:nil];
         }
-        
-        NSData *googleCertData = [NSData dataWithContentsOfFile:path options:0 error:&error];
-        if (!googleCertData) {
-            if (error) {
-                @throw [NSException exceptionWithName:@"OWSSignalServiceHTTPSecurityPolicy" reason:@"Couln't read google pinning cert" userInfo:nil];
-            } else {
-                NSString *reason = [NSString stringWithFormat:@"Reading google pinning cert faile with error: %@", error];
-                @throw [NSException exceptionWithName:@"OWSSignalServiceHTTPSecurityPolicy" reason:reason userInfo:nil];
-            }
+        NSData *GTSGIAG3CertData = [self certificateDataWithName:@"GTSGIAG3" error:&error];
+        if (error) {
+            DDLogError(@"%@ Failed to get GIAG3 certificate data with error: %@", self.tag, error);
+            @throw [NSException exceptionWithName:@"OWSSignalService_UnableToReadCertificate"
+                                           reason:error.description
+                                         userInfo:nil];
         }
-        
-        NSSet<NSData *> *certificates = [NSSet setWithObject:googleCertData];
+
+        NSSet<NSData *> *certificates = [NSSet setWithArray:@[ GIAG2CertData, GTSGIAG3CertData ]];
         securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeCertificate withPinnedCertificates:certificates];
     });
     return securityPolicy;
diff --git a/SignalServiceKit/src/Security/PinningCertificate/GTSGIAG3.crt b/SignalServiceKit/src/Security/PinningCertificate/GTSGIAG3.crt
new file mode 100644
index 000000000..ffb1a0ff9
Binary files /dev/null and b/SignalServiceKit/src/Security/PinningCertificate/GTSGIAG3.crt differ