diff --git a/Library/Homebrew/dev-cmd/bump-formula-pr.rb b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
index 74dea4cf15aa5..c45a3c7382ffc 100644
--- a/Library/Homebrew/dev-cmd/bump-formula-pr.rb
+++ b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
@@ -495,7 +495,7 @@ def check_new_version(formula, tap_remote_repo, version: nil, url: nil, tag: nil
         check_closed_pull_requests(formula, tap_remote_repo, version:)
       end
 
-      sig { params(formula: Formula, new_version: String).returns(NilClass) }
+      sig { params(formula: Formula, new_version: String).void }
       def check_throttle(formula, new_version)
         tap = formula.tap
         return if tap.nil?
diff --git a/Library/Homebrew/dev-cmd/bump.rb b/Library/Homebrew/dev-cmd/bump.rb
index 640845368a7ed..cdbd6c3228f41 100644
--- a/Library/Homebrew/dev-cmd/bump.rb
+++ b/Library/Homebrew/dev-cmd/bump.rb
@@ -314,7 +314,7 @@ def retrieve_pull_requests(formula_or_cask, name, state:, version: nil)
       sig {
         params(
           formula_or_cask: T.any(Formula, Cask::Cask),
-          repositories:    T::Array[T.untyped],
+          repositories:    T::Array[String],
           name:            String,
         ).returns(VersionBumpInfo)
       }
@@ -425,7 +425,7 @@ def retrieve_versions_by_arch(formula_or_cask:, repositories:, name:)
         params(
           formula_or_cask: T.any(Formula, Cask::Cask),
           name:            String,
-          repositories:    T::Array[T.untyped],
+          repositories:    T::Array[String],
           ambiguous_cask:  T::Boolean,
         ).void
       }
diff --git a/Library/Homebrew/dev-cmd/unbottled.rb b/Library/Homebrew/dev-cmd/unbottled.rb
index 7a73caf4a1b81..c77c9929ecfe3 100644
--- a/Library/Homebrew/dev-cmd/unbottled.rb
+++ b/Library/Homebrew/dev-cmd/unbottled.rb
@@ -164,7 +164,9 @@ def formulae_all_installs_from_args(all)
          T.let(formula_installs, T.nilable(T::Hash[Symbol, Integer]))]
       end
 
-      sig { params(all_formulae: T.untyped).returns([T::Hash[String, T.untyped], T::Hash[String, T.untyped]]) }
+      sig {
+        params(all_formulae: T::Array[Formula]).returns([T::Hash[String, T.untyped], T::Hash[String, T.untyped]])
+      }
       def deps_uses_from_formulae(all_formulae)
         ohai "Populating dependency tree..."
 
@@ -186,7 +188,7 @@ def deps_uses_from_formulae(all_formulae)
         [deps_hash, uses_hash]
       end
 
-      sig { params(formulae: T::Array[Formula]).returns(NilClass) }
+      sig { params(formulae: T::Array[Formula]).void }
       def output_total(formulae)
         return unless @bottle_tag
 
@@ -205,7 +207,7 @@ def output_total(formulae)
       sig {
         params(formulae: T::Array[Formula], deps_hash: T::Hash[T.any(Symbol, String), T.untyped],
                noun: T.nilable(String), hash: T::Hash[T.any(Symbol, String), T.untyped],
-               any_named_args: T::Boolean).returns(NilClass)
+               any_named_args: T::Boolean).void
       }
       def output_unbottled(formulae, deps_hash, noun, hash, any_named_args)
         return unless @bottle_tag
@@ -279,7 +281,7 @@ def output_unbottled(formulae, deps_hash, noun, hash, any_named_args)
         puts "No unbottled dependencies found!"
       end
 
-      sig { returns(NilClass) }
+      sig { void }
       def output_lost_bottles
         ohai ":#{@bottle_tag} lost bottles"
 
diff --git a/Library/Homebrew/dev-cmd/update-sponsors.rb b/Library/Homebrew/dev-cmd/update-sponsors.rb
index 26a2202418ec8..7d87756910e74 100644
--- a/Library/Homebrew/dev-cmd/update-sponsors.rb
+++ b/Library/Homebrew/dev-cmd/update-sponsors.rb
@@ -25,8 +25,7 @@ class UpdateSponsors < AbstractCommand
       def run
         named_sponsors = []
         logo_sponsors = []
-        # FIXME: This T.let should be unnecessary https://github.com/sorbet/sorbet/issues/6894
-        largest_monthly_amount = T.let(0, T.untyped)
+        largest_monthly_amount = T.let(0, Integer)
 
         GitHub.sponsorships("Homebrew").each do |s|
           largest_monthly_amount = [s[:monthly_amount], s[:closest_tier_monthly_amount]].max
@@ -62,17 +61,17 @@ def run
 
       private
 
-      sig { params(sponsor: T::Hash[Symbol, T.untyped]).returns(T.nilable(String)) }
+      sig { params(sponsor: T::Hash[Symbol, String]).returns(T.nilable(String)) }
       def sponsor_name(sponsor)
         sponsor[:name] || sponsor[:login]
       end
 
-      sig { params(sponsor: T::Hash[Symbol, T.untyped]).returns(String) }
+      sig { params(sponsor: T::Hash[Symbol, String]).returns(String) }
       def sponsor_logo(sponsor)
         "https://github.com/#{sponsor[:login]}.png?size=64"
       end
 
-      sig { params(sponsor: T::Hash[Symbol, T.untyped]).returns(String) }
+      sig { params(sponsor: T::Hash[Symbol, String]).returns(String) }
       def sponsor_url(sponsor)
         "https://github.com/#{sponsor[:login]}"
       end