diff --git a/CHANGELOG.md b/CHANGELOG.md
index d95f1f489..74893c39a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 
 - `pnpm` version 5 parser including metadata in package versions
+- Platform-specific dependencies ignored by the `Gemfile.lock` parser
 
 ## 7.1.4 - 2024-11-07
 
diff --git a/lockfile/src/parsers/gem.rs b/lockfile/src/parsers/gem.rs
index c755131e4..dd7305111 100644
--- a/lockfile/src/parsers/gem.rs
+++ b/lockfile/src/parsers/gem.rs
@@ -15,10 +15,10 @@ use crate::{Package, PackageVersion, ThirdPartyVersion};
 const DEFAULT_REGISTRY: &str = "https://rubygems.org/";
 
 /// Legal non-alphanumeric characters in loose version specifications.
-const LOOSE_VERSION_CHARS: &[char] = &[' ', ',', '<', '>', '=', '~', '!', '.', '-', '+'];
+const LOOSE_VERSION_CHARS: &[char] = &[' ', ',', '<', '>', '=', '~', '!', '.', '-', '+', '_'];
 
 /// Legal non-alphanumeric characters in strict version specifications.
-const STRICT_VERSION_CHARS: &[char] = &['.', '-', '+'];
+const STRICT_VERSION_CHARS: &[char] = &['.'];
 
 #[derive(Debug)]
 struct Section<'a> {
@@ -224,7 +224,7 @@ fn package_name(input: &str) -> IResult<&str, &str> {
 }
 
 /// Parser allowing for loose `(>= 1.2.0, < 2.0, != 1.2.3)` and strict
-/// `(1.2.3-alpha+build3)` versions.
+/// `(1.2.3.alpha.1)` versions.
 fn loose_package_version(input: &str) -> IResult<&str, &str> {
     // Versions can be completely omitted for sub-dependencies.
     if input.is_empty() {
@@ -241,7 +241,7 @@ fn loose_package_version(input: &str) -> IResult<&str, &str> {
     )(input)
 }
 
-/// Parser allowing only strict `1.2.3-alpha+build3` versions.
+/// Parser allowing only strict `1.2.3.alpha.1` versions.
 fn strict_package_version(input: &str) -> IResult<&str, &str> {
     let (input, _) = space0(input)?;
     recognize(many1(satisfy(|c: char| {
diff --git a/lockfile/src/ruby.rs b/lockfile/src/ruby.rs
index 2570d0a0b..e3942a4eb 100644
--- a/lockfile/src/ruby.rs
+++ b/lockfile/src/ruby.rs
@@ -17,11 +17,17 @@ pub struct GemLock;
 impl Parse for GemLock {
     /// Parses `Gemfile.lock` files into a vec of packages
     fn parse(&self, data: &str) -> anyhow::Result<Vec<Package>> {
-        let (_, entries) = gem::parse(data)
+        let (_, mut packages) = gem::parse(data)
             .finish()
             .map_err(|e| anyhow!(convert_error(data, e)))
             .context("Failed to parse gem lockfile")?;
-        Ok(entries)
+
+        // Remove duplicate dependencies, which can occur when a dependency is included
+        // with multiple different platform suffixes.
+        packages.sort_unstable();
+        packages.dedup();
+
+        Ok(packages)
     }
 
     fn is_path_lockfile(&self, path: &Path) -> bool {
@@ -48,7 +54,7 @@ mod tests {
     #[test]
     fn lock_parse_gem() {
         let pkgs = GemLock.parse(include_str!("../../tests/fixtures/Gemfile.lock")).unwrap();
-        assert_eq!(pkgs.len(), 11);
+        assert_eq!(pkgs.len(), 13);
 
         let expected_pkgs = [
             Package {
@@ -84,6 +90,16 @@ mod tests {
                 }),
                 package_type: PackageType::RubyGems,
             },
+            Package {
+                name: "ffi".into(),
+                version: PackageVersion::FirstParty("1.17.0".into()),
+                package_type: PackageType::RubyGems,
+            },
+            Package {
+                name: "fake".into(),
+                version: PackageVersion::FirstParty("1.2.3".into()),
+                package_type: PackageType::RubyGems,
+            },
         ];
 
         for expected_pkg in expected_pkgs {
diff --git a/tests/fixtures/Gemfile.lock b/tests/fixtures/Gemfile.lock
index 875eeef9d..1eb534946 100644
--- a/tests/fixtures/Gemfile.lock
+++ b/tests/fixtures/Gemfile.lock
@@ -31,7 +31,7 @@ GEM
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
       rspec-mocks (~> 3.11.0)
-    rspec-core (3.11.0-alpha+build3)
+    rspec-core (3.11.0)
       rspec-support (~> 3.11.0)
     rspec-expectations (3.11.1)
       diff-lcs (>= 1.2.0, < 2.0)
@@ -48,6 +48,9 @@ GEM
   remote: https://rubygems.org/
   specs:
     wirble (0.1.3)
+    ffi (1.17.0)
+    ffi (1.17.0-x86_64-linux-gnu)
+    fake (1.2.3-x86_64-linux-gnu)
 
 DEPENDENCIES
   benchmark!