diff --git a/.ameba.yml b/.ameba.yml
new file mode 100644
index 00000000..9dcab208
--- /dev/null
+++ b/.ameba.yml
@@ -0,0 +1,154 @@
+# This configuration file was generated by `ameba --gen-config`
+# on 2025-06-02 13:57:07 UTC using Ameba version 1.7.0-dev.
+# The point is for the user to remove these configuration records
+# one by one as the reported problems are removed from the code base.
+#
+# For more details on any individual rule, run `ameba --only RuleName`.
+
+# Indicators for comment annotations:
+#
+# * `Disabled`: The rule is disabled because it does not seem useful for this repo (or in general).
+# * `BUG`: A bug in ameba prevents using this rule either entirely or for specific files.
+# * `FIXME`: The rule seems useful, but requires some effort to resolve. That's deferred for later.
+# * `TODO`: The rule might be useful, but we need to investigate whether we want to use it or not.
+
+Version: "1.7.0-dev"
+
+Excluded:
+  # BUG: Workaround for https://github.com/crystal-ameba/ameba/issues/782, https://github.com/crystal-ameba/ameba/issues/786, and https://github.com/crystal-ameba/ameba/issues/781
+  - spec/support/factories.cr
+
+# Documentation
+# =========================
+
+# Disabled: What's the point in alerting about existing TODOs in code?
+Documentation/DocumentationAdmonition:
+  Enabled: false
+
+# Lint
+# =========================
+
+# Disabled: `else nil` can be useful to explicitly show the consequence of the else branch
+Lint/ElseNil:
+  Enabled: false
+
+# Disabled: We have an explicit CI job for testing the formatter (both latest
+# and head). No reason to run it through ameba.
+Lint/Formatting:
+  Enabled: false
+
+# TODO: Investigate if some `not_nil!` calls can be avoided.
+Lint/NotNil:
+  Enabled: false
+
+# FIXME: Resolve shadowing.
+Lint/ShadowingOuterLocalVar:
+  Enabled: false
+
+# BUG: https://github.com/crystal-ameba/ameba/issues/612
+Lint/TopLevelOperatorDefinition:
+  Enabled: false
+
+# Disabled: We have an explicit CI job for `typos`. No reason to run it through
+# ameba.
+Lint/Typos:
+  Enabled: false
+
+# TODO: Investigate unused arguments.
+Lint/UnusedArgument:
+  Enabled: false
+
+# TODO: Investigate unused block arguments.
+Lint/UnusedBlockArgument:
+  Enabled: false
+
+Lint/UselessAssign:
+  # BUG: https://github.com/crystal-ameba/ameba/issues/447
+  # This setting is to avoid false positives from the common use of type
+  # declarations in macro arguments.
+  ExcludeTypeDeclarations: true
+
+# Metrics
+# =========================
+
+# Disabled: Lot's of violations. Complexity is very individual.
+Metrics/CyclomaticComplexity:
+  Enabled: false
+
+# Naming
+# =========================
+# All disabled. There are many violations and some of the rules are questionable.
+# TODO: Consider enabling some of these rules.
+
+Naming/AccessorMethodName:
+  Enabled: false
+
+Naming/BinaryOperatorParameterName:
+  Enabled: false
+
+Naming/BlockParameterName:
+  Enabled: false
+
+# Disabled: All violations follow the spelling of identifiers in upstream
+# projects, e.g. for lib bindings.
+Naming/ConstantNames:
+  Enabled: false
+
+Naming/MethodNames:
+  Enabled: false
+
+Naming/PredicateName:
+  Enabled: false
+
+Naming/QueryBoolMethods:
+  Enabled: false
+
+Naming/RescuedExceptionsVariableName:
+  Enabled: false
+
+Naming/TypeNames:
+  Enabled: false
+
+Naming/VariableNames:
+  Enabled: false
+
+# Style
+# =========================
+# All disabled. There are many violations and some of the rules are questionable.
+# TODO: Consider enabling some of these rules.
+
+Style/HeredocEscape:
+  Enabled: false
+
+Style/HeredocIndent:
+  Enabled: false
+
+Style/MultilineCurlyBlock:
+  Enabled: false
+
+# Disabled: This rule seems too strict when any negation inside a complex condition is
+# considered a violation. https://github.com/crystal-ameba/ameba/issues/621
+Style/NegatedConditionsInUnless:
+  Enabled: false
+
+# BUG: https://github.com/crystal-ameba/ameba/issues/614
+Style/ParenthesesAroundCondition:
+  Enabled: false
+
+Style/PercentLiteralDelimiters:
+  Enabled: false
+
+Style/RedundantNext:
+  Enabled: false
+
+Style/RedundantReturn:
+  Enabled: false
+
+Style/RedundantSelf:
+  Enabled: false
+
+Style/VerboseBlock:
+  Enabled: false
+
+Style/WhileTrue:
+  Enabled: false
diff --git a/devenv.nix b/devenv.nix
index 1960ca0c..9e0023b9 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -23,6 +23,14 @@
 
   git-hooks.hooks = {
     actionlint.enable = true;
+    ameba = {
+      enable = true;
+      name = "Ameba";
+      entry = "${pkgs.ameba}/bin/ameba --fix";
+      files = "\\.cr$";
+      excludes = ["^lib/"];
+      pass_filenames = true;
+    };
     check-toml.enable = true;
     check-vcs-permalinks.enable = true;
     circleci.enable = true;
diff --git a/spec/integration/install_spec.cr b/spec/integration/install_spec.cr
index 55a5a3e6..ef94d41e 100644
--- a/spec/integration/install_spec.cr
+++ b/spec/integration/install_spec.cr
@@ -533,7 +533,6 @@ describe "install" do
         override = {dependencies: {
           awesome: {git: git_url(:forked_awesome), branch: "feature/super"},
         }}
-        expected_commit = git_commits(:forked_awesome).first
 
         with_shard(metadata, lock, override) do
           ex = expect_raises(FailedCommand) { run "shards install --no-color --#{flag}" }
@@ -551,7 +550,6 @@ describe "install" do
         override = {dependencies: {
           awesome: {git: git_url(:forked_awesome), branch: "feature/super"},
         }}
-        expected_commit = git_commits(:forked_awesome).first
 
         with_shard(metadata, lock, override) do
           ex = expect_raises(FailedCommand) { run "shards install --no-color --#{flag}" }
diff --git a/spec/support/factories.cr b/spec/support/factories.cr
index 1f28b4c8..d7b3181f 100644
--- a/spec/support/factories.cr
+++ b/spec/support/factories.cr
@@ -312,7 +312,7 @@ def fossil_commits(project, rev = "trunk")
     end
 
     retLines.reject! &.nil?
-    [/artifact:\s+(.+)/.match(run("fossil whatis #{retLines[0]}")).not_nil!.[1]]
+    [/artifact:\s+(.+)/.match(run("fossil whatis #{retLines[0]}")).not_nil![1]] # ameba:disable Lint/NotNilAfterNoBang (1.0 compatibility)
   end
 end
 
@@ -321,7 +321,7 @@ def fossil_url(project)
 end
 
 def fossil_path(project)
-  File.join(tmp_path, "#{project.to_s}")
+  File.join(tmp_path, "#{project}")
 end
 
 def rel_path(project)
diff --git a/src/commands/check.cr b/src/commands/check.cr
index 56351099..9c9c56e9 100644
--- a/src/commands/check.cr
+++ b/src/commands/check.cr
@@ -15,7 +15,7 @@ module Shards
       end
 
       private def has_dependencies?
-        spec.dependencies.any? || (Shards.with_development? && spec.development_dependencies.any?)
+        !spec.dependencies.empty? || (Shards.with_development? && !spec.development_dependencies.empty?)
       end
 
       private def verify(dependencies)
diff --git a/src/commands/list.cr b/src/commands/list.cr
index dd61bfb3..7adc8dfa 100644
--- a/src/commands/list.cr
+++ b/src/commands/list.cr
@@ -30,7 +30,7 @@ module Shards
 
       # FIXME: duplicates Check#has_dependencies?
       private def has_dependencies?
-        spec.dependencies.any? || (Shards.with_development? && spec.development_dependencies.any?)
+        !spec.dependencies.empty? || (Shards.with_development? && !spec.development_dependencies.empty?)
       end
     end
   end
diff --git a/src/commands/outdated.cr b/src/commands/outdated.cr
index 89794706..4cd83480 100644
--- a/src/commands/outdated.cr
+++ b/src/commands/outdated.cr
@@ -112,7 +112,7 @@ module Shards
 
       # FIXME: duplicates Check#has_dependencies?
       private def has_dependencies?
-        spec.dependencies.any? || (Shards.with_development? && spec.development_dependencies.any?)
+        !spec.dependencies.empty? || (Shards.with_development? && !spec.development_dependencies.empty?)
       end
 
       private def dependency_by_name(name : String)
diff --git a/src/molinillo_solver.cr b/src/molinillo_solver.cr
index 4af8b502..dab73045 100644
--- a/src/molinillo_solver.cr
+++ b/src/molinillo_solver.cr
@@ -182,7 +182,7 @@ module Shards
 
         @search_results[{dependency.name, dependency.requirement}] ||= begin
           resolver = dependency.resolver
-          versions = Versions.sort(versions_for(dependency, resolver)).reverse
+          versions = Versions.sort(versions_for(dependency, resolver)).reverse!
           result = versions.map do |version|
             @specs[{dependency.name, version}] ||= begin
               resolver.spec(version).tap do |spec|
diff --git a/src/target.cr b/src/target.cr
index 19810d7c..b49c9fee 100644
--- a/src/target.cr
+++ b/src/target.cr
@@ -9,7 +9,7 @@ module Shards
       main = nil
 
       pull.each_in_mapping do
-        case key = pull.read_scalar
+        case pull.read_scalar
         when "main"
           main = pull.read_scalar
         else