diff --git a/bilby/gw/prior_files/aligned_spins_bbh.prior b/bilby/gw/prior_files/aligned_spins_bbh.prior
index 42e5b699ef4edbead3d4dd138f5cf2e18c79156a..4a15f7a3a14f85ee65385d6ca30263ed7c5c6ca9 100644
--- a/bilby/gw/prior_files/aligned_spins_bbh.prior
+++ b/bilby/gw/prior_files/aligned_spins_bbh.prior
@@ -5,7 +5,7 @@
 mass_1 = Constraint(name='mass_1', minimum=5, maximum=100)
 mass_2 = Constraint(name='mass_2', minimum=5, maximum=100)
 mass_ratio = Uniform(name='mass_ratio', minimum=0.125, maximum=1)
-chirp_mass = Uniform(name='chirp_mass', minimum=4.3, maximum=100)
+chirp_mass = Uniform(name='chirp_mass', minimum=25, maximum=100)
 luminosity_distance = bilby.gw.prior.UniformSourceFrame(name='luminosity_distance', minimum=1e2, maximum=5e3)
 dec = Cosine(name='dec')
 ra = Uniform(name='ra', minimum=0, maximum=2 * np.pi, boundary='periodic')
diff --git a/bilby/gw/prior_files/aligned_spins_bbh_tides_on.prior b/bilby/gw/prior_files/aligned_spins_bbh_tides_on.prior
index 68466ab0009b72d58b502ab8546f48e46ec58503..4fc71953eacb34b364e6a55b6a3d521ee7609b81 100644
--- a/bilby/gw/prior_files/aligned_spins_bbh_tides_on.prior
+++ b/bilby/gw/prior_files/aligned_spins_bbh_tides_on.prior
@@ -5,7 +5,7 @@
 mass_1 = Constraint(name='mass_1', minimum=5, maximum=100)
 mass_2 = Constraint(name='mass_2', minimum=5, maximum=100)
 mass_ratio = Uniform(name='mass_ratio', minimum=0.125, maximum=1)
-chirp_mass = Uniform(name='chirp_mass', minimum=4.3, maximum=100)
+chirp_mass = Uniform(name='chirp_mass', minimum=25, maximum=100)
 luminosity_distance = bilby.gw.prior.UniformSourceFrame(name='luminosity_distance', minimum=1e2, maximum=5e3)
 dec = Cosine(name='dec')
 ra = Uniform(name='ra', minimum=0, maximum=2 * np.pi, boundary='periodic')
diff --git a/bilby/gw/prior_files/precessing_spins_bbh.prior b/bilby/gw/prior_files/precessing_spins_bbh.prior
index a43874ae910a2a53ce3a502c20cb78ac320239a4..27094d689666e2a6e195e36f4b795c9feb3347c3 100644
--- a/bilby/gw/prior_files/precessing_spins_bbh.prior
+++ b/bilby/gw/prior_files/precessing_spins_bbh.prior
@@ -5,7 +5,7 @@
 mass_1 = Constraint(name='mass_1', minimum=5, maximum=100)
 mass_2 = Constraint(name='mass_2', minimum=5, maximum=100)
 mass_ratio = Uniform(name='mass_ratio', minimum=0.125, maximum=1)
-chirp_mass = Uniform(name='chirp_mass', minimum=4.3, maximum=100)
+chirp_mass = Uniform(name='chirp_mass', minimum=25, maximum=100)
 luminosity_distance = bilby.gw.prior.UniformSourceFrame(name='luminosity_distance', minimum=1e2, maximum=5e3)
 dec = Cosine(name='dec')
 ra = Uniform(name='ra', minimum=0, maximum=2 * np.pi, boundary='periodic')
diff --git a/bilby/gw/prior_files/precessing_spins_bbh_tides_on.prior b/bilby/gw/prior_files/precessing_spins_bbh_tides_on.prior
index 826a73219e0b24f859211ed6bbe511b4b1dd30f0..81da0482f26708a1cf5cb5d11fdd61f6fc2654b4 100644
--- a/bilby/gw/prior_files/precessing_spins_bbh_tides_on.prior
+++ b/bilby/gw/prior_files/precessing_spins_bbh_tides_on.prior
@@ -5,7 +5,7 @@
 mass_1 = Constraint(name='mass_1', minimum=5, maximum=100)
 mass_2 = Constraint(name='mass_2', minimum=5, maximum=100)
 mass_ratio = Uniform(name='mass_ratio', minimum=0.125, maximum=1)
-chirp_mass = Uniform(name='chirp_mass', minimum=4.3, maximum=100)
+chirp_mass = Uniform(name='chirp_mass', minimum=25, maximum=100)
 luminosity_distance = bilby.gw.prior.UniformSourceFrame(name='luminosity_distance', minimum=1e2, maximum=5e3)
 dec = Cosine(name='dec')
 ra = Uniform(name='ra', minimum=0, maximum=2 * np.pi, boundary='periodic')
diff --git a/test/prior_files/aligned_spins_bbh.prior b/test/prior_files/aligned_spins_bbh.prior
index 42e5b699ef4edbead3d4dd138f5cf2e18c79156a..4a15f7a3a14f85ee65385d6ca30263ed7c5c6ca9 100644
--- a/test/prior_files/aligned_spins_bbh.prior
+++ b/test/prior_files/aligned_spins_bbh.prior
@@ -5,7 +5,7 @@
 mass_1 = Constraint(name='mass_1', minimum=5, maximum=100)
 mass_2 = Constraint(name='mass_2', minimum=5, maximum=100)
 mass_ratio = Uniform(name='mass_ratio', minimum=0.125, maximum=1)
-chirp_mass = Uniform(name='chirp_mass', minimum=4.3, maximum=100)
+chirp_mass = Uniform(name='chirp_mass', minimum=25, maximum=100)
 luminosity_distance = bilby.gw.prior.UniformSourceFrame(name='luminosity_distance', minimum=1e2, maximum=5e3)
 dec = Cosine(name='dec')
 ra = Uniform(name='ra', minimum=0, maximum=2 * np.pi, boundary='periodic')
diff --git a/test/prior_files/aligned_spins_bbh_tides_on.prior b/test/prior_files/aligned_spins_bbh_tides_on.prior
index 68466ab0009b72d58b502ab8546f48e46ec58503..4fc71953eacb34b364e6a55b6a3d521ee7609b81 100644
--- a/test/prior_files/aligned_spins_bbh_tides_on.prior
+++ b/test/prior_files/aligned_spins_bbh_tides_on.prior
@@ -5,7 +5,7 @@
 mass_1 = Constraint(name='mass_1', minimum=5, maximum=100)
 mass_2 = Constraint(name='mass_2', minimum=5, maximum=100)
 mass_ratio = Uniform(name='mass_ratio', minimum=0.125, maximum=1)
-chirp_mass = Uniform(name='chirp_mass', minimum=4.3, maximum=100)
+chirp_mass = Uniform(name='chirp_mass', minimum=25, maximum=100)
 luminosity_distance = bilby.gw.prior.UniformSourceFrame(name='luminosity_distance', minimum=1e2, maximum=5e3)
 dec = Cosine(name='dec')
 ra = Uniform(name='ra', minimum=0, maximum=2 * np.pi, boundary='periodic')
diff --git a/test/prior_files/precessing_spins_bbh.prior b/test/prior_files/precessing_spins_bbh.prior
index a43874ae910a2a53ce3a502c20cb78ac320239a4..27094d689666e2a6e195e36f4b795c9feb3347c3 100644
--- a/test/prior_files/precessing_spins_bbh.prior
+++ b/test/prior_files/precessing_spins_bbh.prior
@@ -5,7 +5,7 @@
 mass_1 = Constraint(name='mass_1', minimum=5, maximum=100)
 mass_2 = Constraint(name='mass_2', minimum=5, maximum=100)
 mass_ratio = Uniform(name='mass_ratio', minimum=0.125, maximum=1)
-chirp_mass = Uniform(name='chirp_mass', minimum=4.3, maximum=100)
+chirp_mass = Uniform(name='chirp_mass', minimum=25, maximum=100)
 luminosity_distance = bilby.gw.prior.UniformSourceFrame(name='luminosity_distance', minimum=1e2, maximum=5e3)
 dec = Cosine(name='dec')
 ra = Uniform(name='ra', minimum=0, maximum=2 * np.pi, boundary='periodic')
diff --git a/test/prior_files/precessing_spins_bbh_tides_on.prior b/test/prior_files/precessing_spins_bbh_tides_on.prior
index 826a73219e0b24f859211ed6bbe511b4b1dd30f0..81da0482f26708a1cf5cb5d11fdd61f6fc2654b4 100644
--- a/test/prior_files/precessing_spins_bbh_tides_on.prior
+++ b/test/prior_files/precessing_spins_bbh_tides_on.prior
@@ -5,7 +5,7 @@
 mass_1 = Constraint(name='mass_1', minimum=5, maximum=100)
 mass_2 = Constraint(name='mass_2', minimum=5, maximum=100)
 mass_ratio = Uniform(name='mass_ratio', minimum=0.125, maximum=1)
-chirp_mass = Uniform(name='chirp_mass', minimum=4.3, maximum=100)
+chirp_mass = Uniform(name='chirp_mass', minimum=25, maximum=100)
 luminosity_distance = bilby.gw.prior.UniformSourceFrame(name='luminosity_distance', minimum=1e2, maximum=5e3)
 dec = Cosine(name='dec')
 ra = Uniform(name='ra', minimum=0, maximum=2 * np.pi, boundary='periodic')