diff --git a/.toys/run/Gemfile b/.toys/run/Gemfile
index 0bd2f1860..9f643d86f 100644
--- a/.toys/run/Gemfile
+++ b/.toys/run/Gemfile
@@ -5,4 +5,4 @@ source "https://rubygems.org"
 gem "gapic-generator",       path: "../../gapic-generator"
 gem "gapic-generator-ads", path: "../../gapic-generator-ads"
 gem "gapic-generator-cloud", path: "../../gapic-generator-cloud"
-gem "grpc-tools", ">= 1.60.0", "< 1.75.1"
+gem "grpc-tools", ">= 1.60.0", "< 1.78.2"
diff --git a/gapic-generator-ads/Gemfile b/gapic-generator-ads/Gemfile
index c6d54563f..041f5a0c4 100644
--- a/gapic-generator-ads/Gemfile
+++ b/gapic-generator-ads/Gemfile
@@ -9,7 +9,7 @@ gemspec
 
 gem "gapic-generator", path: "../gapic-generator"
 
-gem "grpc-tools", ">= 1.60.0", "< 1.75.1"
+gem "grpc-tools", ">= 1.60.0", "< 1.78.2"
 gem "minitest", "~> 5.16"
 gem "minitest-autotest", "~> 1.0"
 gem "minitest-focus", "~> 1.0"
diff --git a/gapic-generator-ads/Gemfile.lock b/gapic-generator-ads/Gemfile.lock
index e53200194..c62b078ca 100644
--- a/gapic-generator-ads/Gemfile.lock
+++ b/gapic-generator-ads/Gemfile.lock
@@ -67,7 +67,7 @@ GEM
       rubocop (~> 1.76)
     googleapis-common-protos-types (1.22.0)
       google-protobuf (~> 4.26)
-    grpc-tools (1.75.0)
+    grpc-tools (1.78.1)
     i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     io-console (0.8.2)
@@ -151,7 +151,7 @@ PLATFORMS
 DEPENDENCIES
   gapic-generator!
   gapic-generator-ads!
-  grpc-tools (>= 1.60.0, < 1.75.1)
+  grpc-tools (>= 1.60.0, < 1.78.2)
   minitest (~> 5.16)
   minitest-autotest (~> 1.0)
   minitest-focus (~> 1.0)
diff --git a/gapic-generator-cloud/Gemfile b/gapic-generator-cloud/Gemfile
index 98e06a5e0..dc3d4d2fd 100644
--- a/gapic-generator-cloud/Gemfile
+++ b/gapic-generator-cloud/Gemfile
@@ -9,7 +9,7 @@ gemspec
 
 gem "gapic-generator", path: "../gapic-generator"
 
-gem "grpc-tools", ">= 1.60.0", "< 1.75.1"
+gem "grpc-tools", ">= 1.60.0", "< 1.78.2"
 gem "minitest", "~> 5.16"
 gem "minitest-autotest", "~> 1.0"
 gem "minitest-focus", "~> 1.0"
diff --git a/gapic-generator-cloud/Gemfile.lock b/gapic-generator-cloud/Gemfile.lock
index 0266939bf..a179b7f8d 100644
--- a/gapic-generator-cloud/Gemfile.lock
+++ b/gapic-generator-cloud/Gemfile.lock
@@ -67,7 +67,7 @@ GEM
       rubocop (~> 1.76)
     googleapis-common-protos-types (1.22.0)
       google-protobuf (~> 4.26)
-    grpc-tools (1.75.0)
+    grpc-tools (1.78.1)
     i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     io-console (0.8.2)
@@ -151,7 +151,7 @@ PLATFORMS
 DEPENDENCIES
   gapic-generator!
   gapic-generator-cloud!
-  grpc-tools (>= 1.60.0, < 1.75.1)
+  grpc-tools (>= 1.60.0, < 1.78.2)
   minitest (~> 5.16)
   minitest-autotest (~> 1.0)
   minitest-focus (~> 1.0)
diff --git a/gapic-generator/Gemfile b/gapic-generator/Gemfile
index c1cb7c70f..41fdc71ab 100644
--- a/gapic-generator/Gemfile
+++ b/gapic-generator/Gemfile
@@ -7,7 +7,7 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 # Specify your gem's dependencies in gapic-generator.gemspec
 gemspec
 
-gem "grpc-tools", ">= 1.60.0", "< 1.75.1"
+gem "grpc-tools", ">= 1.60.0", "< 1.78.2"
 gem "minitest", "~> 5.16"
 gem "minitest-autotest", "~> 1.0"
 gem "minitest-focus", "~> 1.0"
diff --git a/gapic-generator/Gemfile.lock b/gapic-generator/Gemfile.lock
index 7312b263a..c1c8d32b2 100644
--- a/gapic-generator/Gemfile.lock
+++ b/gapic-generator/Gemfile.lock
@@ -61,7 +61,7 @@ GEM
       rubocop (~> 1.76)
     googleapis-common-protos-types (1.22.0)
       google-protobuf (~> 4.26)
-    grpc-tools (1.75.0)
+    grpc-tools (1.78.1)
     i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     io-console (0.8.2)
@@ -144,7 +144,7 @@ PLATFORMS
 
 DEPENDENCIES
   gapic-generator!
-  grpc-tools (>= 1.60.0, < 1.75.1)
+  grpc-tools (>= 1.60.0, < 1.78.2)
   minitest (~> 5.16)
   minitest-autotest (~> 1.0)
   minitest-focus (~> 1.0)
diff --git a/shared/Gemfile b/shared/Gemfile
index e61479dbf..2d26f187a 100644
--- a/shared/Gemfile
+++ b/shared/Gemfile
@@ -11,7 +11,7 @@ gem "gapic-generator-cloud", path: "../gapic-generator-cloud"
 gem "google-cloud-location", ">= 0.4", "< 2.a"
 gem "google-iam-v1", ">= 0.4", "< 2.a"
 
-gem "grpc-tools", ">= 1.60.0", "< 1.75.1"
+gem "grpc-tools", ">= 1.60.0", "< 1.78.2"
 gem "minitest", "~> 5.16"
 gem "minitest-autotest", "~> 1.0"
 gem "minitest-focus", "~> 1.0"