diff --git a/spec/jwt/jwa/ps_spec.rb b/spec/jwt/jwa/ps_spec.rb
index 1043e9bc..2aa2983b 100644
--- a/spec/jwt/jwa/ps_spec.rb
+++ b/spec/jwt/jwa/ps_spec.rb
@@ -48,7 +48,7 @@
     end
 
     context 'with a key length less than 2048 bits' do
-      let(:rsa_key) { OpenSSL::PKey::RSA.generate(2047) }
+      let(:rsa_key) { OpenSSL::PKey::RSA.generate(1536) }
 
       it 'raises an error' do
         expect do
diff --git a/spec/jwt/jwa/rsa_spec.rb b/spec/jwt/jwa/rsa_spec.rb
index 318ea8e6..4f39cc20 100644
--- a/spec/jwt/jwa/rsa_spec.rb
+++ b/spec/jwt/jwa/rsa_spec.rb
@@ -21,7 +21,7 @@
     end
 
     context 'with a key length less than 2048 bits' do
-      let(:rsa_key) { OpenSSL::PKey::RSA.generate(2047) }
+      let(:rsa_key) { OpenSSL::PKey::RSA.generate(1024) }
 
       it 'raises an error' do
         expect do